VN-BARO

## VN Series 

## Pressure Sensor Family for Ventilator Applications 

- Family of inspiratory, expiratory, flow, inlet & barometric pressure sensors 

- Highly integrated sensors with ADC and DSP 

- Output Data Rate up to 1.09kHz 

- 24-bit resolution (each selected range) 

- Pure O2 compatible 

- Up to 8 Selectable Pressure Ranges per Device 

- Exceptional Zero Stability 

- Selectable Bandwidth Filter from 1.0Hz to 500Hz 

- Total Error Band less than 0.15% FSS 

- Very High Accuracy ±0.05% of Selected Range 

- Long Term Stability ±0.10% FSS 

- Sensors for flow available in high and extreme resolution 

- Inlet & Barometric pressure sensors include silicone gel protection 

- Temperature Compensated 0°C to 50°C 

- Fully Integrated Compensation Math 

- Standard I[2] C and SPI Interface 

## Product Summary 

Based on Superior’s NimbleSense™ architecture, the VN Series is a comprehensive set of pressure sensors for ventilator and high flow oxygen devices. The family of products includes sensors for measuring inlet (wall and tank), flow, inspiratory, expiratory and barometric pressures. The VN Series utilizes Multi-Range[TM] technology to create the industry’s widest dynamic range, eliminating the need for fine tuning or additional calibration. 

With optional advanced digital filtering customization and a 3-mode pressure switch, the VN Series is more than a pressure sensor – it is a pressure sensing sub-system. 

Finally, the VN Series eliminates the need for the ventilator to oversample sensor outputs, as the sensor oversamples at 12kHz and includes internal bandwidth filters to provide a clean > 1kHz update rate. 

The VN Series combines an advanced piezoresistive sensing element with integrated amplification, ADC, DSP and a digital interface. Advanced digital processing enables new functionality thus simplifying system development, adding manufacturing ease and increasing reliability. 

Constructed with a high reliability plastic enclosure, the VN Series provides the ideal combination of very high performance and reliability while ensuring customers have a high volume, cost effective solution optimized for ventilators and high flow oxygen devices. 

|**Application**<br>~~a~~|**VN025CM**|**VN026CM**<br>~~ee~~|**VN130CM**<br>~~eeeee~~|**VN131CM**<br>~~eeeeee~~|**VN150D**<br>~~eeeeee~~|**VN150A**<br>~~eeeeee~~|**VN-BARO**<br>~~eeeee~~|
|---|---|---|---|---|---|---|---|
|_Pressure Ranges_<br>_Silicone gel protection_<br>~~a~~<br>~~ee~~|±5 to ±25 cmH2O<br>~~OD~~|±2.5 to ±25 cmH2O<br>~~ee~~<br>~~OD~~|±80 to ±130 cmH2O <br>~~eeeee~~<br>~~OD~~|±60 to ±130 cmH2O<br>~~eeeeee~~<br>~~OD~~|±80 to ±150 psi<br>~~eeeeee~~<br>~~OD~~|80 to 150 psia<br>~~eeeeee~~<br>~~OD~~|350 to 1100 mbar<br>~~eeeee~~<br>~~OD~~|
|**Inlet Pressure**<br>~~a~~<br>~~ee~~<br>~~ee~~|~~OD~~|~~ee~~<br>~~OD~~|~~ee eee~~<br>~~OD~~|~~eee eee~~<br>~~OD~~<br>~~ae|.~~|~~eee eee~~<br>~~OD~~<br>~~|.|.~~|~~eee eee~~<br>~~OD~~<br>~~|.|...~~|~~eee ee~~<br>~~OD~~<br>~~|...~~|
|**Inspiratory Pressure**<br>~~ee ~~<br>~~ee~~<br>~~|...~~|~~OD~~<br>~~|...~~|~~OD~~<br>~~|~~|~~OD~~|~~OD~~<br>~~ae|.~~<br>~~ea|.~~|~~OD~~<br>~~|.|.~~<br>~~|.~~<br>~~|...~~|~~OD~~<br>~~|.|...~~<br>~~|... |...~~|~~OD~~<br>~~|...~~<br>~~|...~~|
|**Expiratory Pressure**<br>~~ee~~<br>~~|...~~<br>~~a~~|~~|...~~<br>~~a~~|~~|~~<br>~~ee~~|~~ee~~|~~ae |.~~<br>~~ea|.~~|~~|. |.~~<br>~~|.~~<br>~~|...~~|~~|. |...~~<br>~~|... |...~~|~~|...~~<br>~~|...~~|
|**Expiratory Flow**<br>~~|...~~<br>~~a~~<br>~~ee”~~|~~|... ~~<br>~~a~~<br>~~ee”ee~~|~~|~~<br>~~ee~~<br>~~ee~~|~~ee~~<br>~~a~~|~~ea |.~~<br>~~a~~|~~|.~~<br>~~|...~~<br>~~a~~|~~|... |...~~<br>~~a~~|~~|...~~<br>~~a~~|
|**Flow (Blower based)**<br>~~a~~<br>~~ee”~~|~~a~~<br>~~ee”ee~~|~~ee~~<br>~~ee~~|~~ee~~<br>~~a~~|~~a~~|~~a~~|~~a~~|~~a~~|
|**Flow (Wall & Tank based)**<br>~~ee”~~<br>~~a~~|~~ee” ee~~<br>~~a~~|~~ee ~~|~~a~~|~~a~~|~~a~~<br>~~ee~~|~~a~~<br>~~ee~~|~~a~~<br>~~ee~~|
|**Volumetric to Mass Flow**<br>~~a~~<br>~~a~~|~~a~~<br>~~a~~|~~GO~~|~~GO~~||~~ee~~|~~ee~~|~~ee~~|



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DS-0008B.DOCX 

## VN Series 

## Ventilator Pressure Sensors 

## Table of Contents 

|1 Maximum Ratings .......................................................................... 2|1 Maximum Ratings .......................................................................... 2|1 Maximum Ratings .......................................................................... 2|
|---|---|---|
|2 Suggested Operating Conditions ................................................... 2|2 Suggested Operating Conditions ................................................... 2||
|3 Environmental ............................................................................... 2|3 Environmental ............................................................................... 2||
|4 Equivalent Circuit ........................................................................... 2|4 Equivalent Circuit ........................................................................... 2||
|5 Feature List .................................................................................... 3|5 Feature List .................................................................................... 3||
||5.1|Low Pressure (cmH2O Ranges) ............................................ 3|
||5.2|Middle Pressure (psi Ranges) ............................................... 3|
||5.3|Barometric Pressure (mbar Ranges) .................................... 3|
|6 Performance Characteristics.......................................................... 4|6 Performance Characteristics.......................................................... 4||
||6.1|Low Pressure (cmH2O Ranges) ............................................ 4|
||6.2|Middle Pressure (psi Ranges) ............................................... 4|
||6.3|Barometric Pressure (mbar Ranges) .................................... 5|
|7 Electrical Characteristics ................................................................ 5|7 Electrical Characteristics ................................................................ 5||
||7.1|Supply Characteristics .......................................................... 5|
||7.2|Reset Characteristics ............................................................ 6|
||7.3|DAV Characteristics.............................................................. 6|
||7.4|I2C Characteristics ................................................................ 6|
||7.5|SPI Characteristics ................................................................ 7|
|8 Materials ........................................................................................ 7|8 Materials ........................................................................................ 7||
||8.1|Wetted Materials ................................................................. 7|
||8.2|Material Compliance ............................................................ 7|
|9 System Overview ........................................................................... 8|9 System Overview ........................................................................... 8||
|10 Interface ........................................................................................ 9|10 Interface ........................................................................................ 9||
||10.1 Reset .................................................................................... 9|10.1 Reset .................................................................................... 9|
||10.2 Communication Interface Selection..................................... 9|10.2 Communication Interface Selection..................................... 9|
||10.3 SPI Interface ......................................................................... 9|10.3 SPI Interface ......................................................................... 9|
||10.4 I|10.4 I2C Interface ....................................................................... 10|
|||10.4.1 I2C Address ............................................................. 10|
|||10.4.2 I2C Communications Model ................................... 10|
|||10.4.3 I2C Clock Stretching ................................................ 11|
|||10.4.4 I2C Bus Compatibility .............................................. 11|
||10.5 Extended Data Acquisition ................................................. 12|10.5 Extended Data Acquisition ................................................. 12|
|||10.5.1 Available Extended Data ........................................ 12|
|||10.5.2 SPI Extended Data Read ......................................... 12|
|||10.5.3 I2C Extended Data Read ......................................... 12|
||10.6 Control Registers ............................................................... 13|10.6 Control Registers ............................................................... 13|
|||10.6.1 Mode Control Register ........................................... 13|
|||10.6.2 Rate Control Register ............................................. 14|
||10.7 Computing Pressure........................................................... 14|10.7 Computing Pressure........................................................... 14|
|11 Mechanical and Manufacturing ................................................... 15|11 Mechanical and Manufacturing ................................................... 15||
||11.1 Package Dimensions .......................................................... 15|11.1 Package Dimensions .......................................................... 15|
||11.2 Suggested Pad Layout ........................................................ 15|11.2 Suggested Pad Layout ........................................................ 15|
||11.3 Pinout ................................................................................ 16|11.3 Pinout ................................................................................ 16|
||11.4 Reflow Soldering and Handling Conditions ........................ 16|11.4 Reflow Soldering and Handling Conditions ........................ 16|
||11.5 Pick and Place Pick-up Zone ............................................... 16|11.5 Pick and Place Pick-up Zone ............................................... 16|
||11.6 Packaging Options ............................................................. 17|11.6 Packaging Options ............................................................. 17|
|||11.6.1 Tray Packaging ....................................................... 17|
|||11.6.2 Tape and Reel ........................................................ 18|
||11.7 Part Identification .............................................................. 18|11.7 Part Identification .............................................................. 18|
|12 Packaging Labeling ....................................................................... 19|12 Packaging Labeling ....................................................................... 19||
|13 Ordering Information .................................................................. 19|13 Ordering Information .................................................................. 19||
|14 Revisions ...................................................................................... 20|14 Revisions ...................................................................................... 20||
|15 Warranty ...................................................................................... 20|15 Warranty ...................................................................................... 20||



## 1 Maximum Ratings 

|**Parameter**|**Sym**|**Min**|**Max**|**Units**|
|---|---|---|---|---|
|Supply Voltage|VDDM|Gnd-0.3|4.0|V|
|Voltage on I/O Pins<br>VDD> 3.3V<br>VDD≤ 3.3V|VIOML<br>VIOMH|Gnd-0.3<br>Gnd-0.3|5.8<br>VDD+2.5|V<br>V|
|I/O Current|IIOM|-25|25|mA|



## 2 Suggested Operating Conditions 

|**Parameter**|**Sym**|**Min**|**Max**|**Units**|
|---|---|---|---|---|
|Supply Voltage|VDDOP|2.8|3.5|V|
|Temperature|TA|0|50|°C|



## 3 Environmental 

|**Parameter**|**Sym**|**Min**|**Max**|**Units**|
|---|---|---|---|---|
|Temperature Range<br>Compensated<br>Operating<br>Storage|TCMP<br>TOP<br>TSTG|0<br>-20<br>-40|50<br>85<br>85|°C<br>°C<br>°C|
|Humidity<br>(Non-condensing)|RHOP|0|95|% RH|
|Vibration<br>(10Hz-2kHz)|GVIBE|-|15|g|
|Shock (6 ms)|GSHOCK|-|100|g|
|Life|CYLIFE|100M|-|Pressure<br>Cycles|



## 4 Equivalent Circuit 

**==> picture [255 x 103] intentionally omitted <==**

**----- Start of picture text -----**<br>
DAV DAV<br>nRST nRST<br>PLOW Port A PLOW Port A<br>MISO/SDA MISO/SDA<br>PHIGH Port B Sensor MOSI/SCL PHIGH Port B Sensor MOSI/SCL<br>(SPI) SCK (I [2] C) SCK VI2C Address<br>nSS nSS<br>VDD VDD<br>Gnd Gnd<br>FIG-0026C<br>**----- End of picture text -----**<br>


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DS-0008B.DOCX 

## VN Series 

## Ventilator Pressure Sensors 

## 5 Feature List 

|5.1 Inspiratory,Expiratoryand Flow Pressure (cmH2ORanges)|
|---|
|**Parameter**<br>**Sym**<br>**VN025CM**<br>**VN026CM**<br>**VN130CM**<br>**VN131CM**<br>**Units**<br>**Notes**<br>Number of FS Pressure Ranges<br>PNUM<br>6<br>7<br>6<br>8<br>Each<br>Specified FS Range Extents<br>PEXT<br>±5.0 to ±25<br>±2.5 to ±25<br>±80 to ±130<br>±60 to ±130<br>cmH2O<br>Number of BW Filter Corners<br>BWNUM<br>8<br>Each<br>BW Corner Frequency Extents<br>fBWEXT<br>20 to 500<br>Hz<br>Common Mode Pressure<br>PCM<br>1,500<br>2,000<br>cmH2O<br>1<br>Proof Pressure<br>PPROOF<br>100<br>1,000<br>cmH2O<br>2<br>Burst Pressure<br>PBURST<br>300<br>3,000<br>cmH2O<br>3<br>~~Dns~~<br>~~(| ee~~<br>~~|~~<br>~~ee~~<br>~~es~~<br>~~Gs nn~~<br>~~rs~~<br>~~es~~<br>~~Ps~~<br>~~ee~~<br>~~Gs~~<br>~~es~~<br>~~Pd~~<br>~~ee~~<br>~~es~~<br>~~ee~~<br>~~Gs~~|
|5.2 Inlet Pressure (psi Ranges)|
|**Parameter**<br>**Sym**<br>**VN150D**<br>**VN150A**<br>**Units**<br>**Notes**|
|**(psid)**<br>**(psia)**<br>Number of FS Pressure Ranges<br>PNUM<br>6<br>1<br>Each<br>Specified FS Range Extents<br>PEXT<br>±80 to ±150<br>80 to 150<br>psi(a)<br>Number of BW Filter Corners<br>BWNUM<br>8<br>8<br>Each<br>BW Corner Frequency Extents<br>fBWEXT<br>1.0 to 300<br>1.0 to 300<br>Hz<br>Common Mode Pressure<br>PCM<br>150<br>150<br>psi(a)<br>1<br>Proof Pressure<br>PPROOF<br>250<br>250<br>psi(a)<br>2<br>Burst Pressure<br>PBURST<br>300<br>300<br>psi(a)<br>3<br>~~ee~~<br>~~es~~<br>~~es~~<br>~~ee~~<br>~~es~~<br>~~es~~<br>~~ee~~<br>~~ee~~<br>~~ne~~<br>~~es~~<br>~~ne~~<br>~~es~~<br>~~ne~~<br>~~es~~<br>~~ee~~<br>~~es~~|



## 5.3 Barometric Pressure (mbar Range) 

|**Parameter**|**Sym**|**VN-BARO**<br>**(psid)**|**Units**|**Notes**|
|---|---|---|---|---|
|Number of FS Pressure Ranges|PNUM|6|Each||
|Specified FS Range Extents|PEXT|350-1100<br>to<br>800-1100|mbar||
|Number of BW Filter Corners|BWNUM|8|Each||
|BW Corner Frequency Extents|fBWEXT|1.0 to 300|Hz||
|Proof Pressure|PPROOF|35|mbar|2|
|Burst Pressure|PBURST|40|mbar|3|



- 1) Pressure applied to both ports simultaneously without incurring part damage. 

- 2) Pressure at which the sensor will not suffer permanent damage. 

- 3) Pressure if exceeded could cause permanent damage to the sensor. 

3 

DS-0008B.DOCX 

## VN Series 

## Ventilator Pressure Sensors 

## 6 Performance Characteristics 

Note: Unless otherwise specified, characteristics specified with VDD = 3.3V, TA = 25C 

## 6.1 Inspiratory, Expiratory and Flow Pressure (cmH2O Ranges) 

|**Parameter**|**Sym**<br>~~LE~~|**VN025CM/VN130CM**<br>~~LE~~|**VN026CM**|**VN131CM**|**Units**|**Notes**|
|---|---|---|---|---|---|---|
|||**Min**<br>**Typ**<br>**Max**<br>~~LE~~|**Min**<br>**Typ**<br>**Max**|**Min**<br>**Typ**<br>**Max**|||
|Accuracy<br>~~a~~|PACC|-<br>0.05<br>0.20|-<br>0.05<br>0.20|-<br>0.05<br>0.20|% RNG|1|
|Total Error Band<br>~~a~~|TEB|-<br>0.15<br>0.30|-<br>0.10<br>0.25|-<br>0.10<br>0.25|% FSS|3|
|TEB After AZ<br>~~a~~|TEBAZ|-<br>0.05<br>0.20|-<br>0.05<br>0.15|-<br>0.05<br>0.15|% FSS|7|
|Long Term Stability<br>~~a~~|LTS|-<br>0.10<br>0.25|-<br>0.05<br>0.15|-<br>0.05<br>0.15|% FSS/Yr|2|
|Thermal Hysteresis<br>~~a~~|THYS|-<br>0.05<br>-|-<br>0.03<br>-|-<br>0.03<br>-|% FSS||
|Pressure Hysteresis<br>~~a~~|PHYS|-<br>0.05<br>-|-<br>0.05<br>-|-<br>0.05<br>-|% RNG|1|
|Position Sensitivity<br>~~a~~|PPS|-<br>0.03<br>-|-<br>0.003<br>-|-<br>0.003<br>-|cmH2O||
|Supply Rejection<br>~~a~~|PSR|-<br>0.0005<br>-|-<br>0.0005<br>-|-<br>0.0005<br>-|% FSS/mV||
|Output Resolution<br>~~a~~|RESOUT|-<br>24<br>-|-<br>24<br>-|-<br>24<br>-|bit|4|
|Effective Resolution<br>~~a~~|RESEFF|-<br>16<br>-|-<br>18.5<br>-|-<br>18.0<br>-|BitRMS|5|
|Data Update Rate<br>~~a~~|fUPDATE<br>|1.05<br>1.09<br>1.12<br>|1.05<br>1.09<br>1.12<br>|1.05<br>1.09<br>1.12<br>|kHz|6|



|**Parameter**<br>~~Bf~~<br>~~ee~~<br>~~a~~|**Sym**<br>~~Bf~~<br>~~es~~<br>~~es~~|**VN150D**<br>~~Bf~~<br>~~es~~|**VN150A**<br>~~Bf~~|**Units**<br>~~Bf~~<br>~~|~~|**Notes**<br>~~Bf~~<br>~~|SI~~|
|---|---|---|---|---|---|
|||**Min**<br>**Typ**<br>**Max**<br>~~Bf~~<br>~~es~~|**Min**<br>**Typ**<br>**Max**<br>~~Bf~~|||
|Accuracy<br>~~ee~~<br>~~a~~<br>~~a~~|PACC<br>~~es~~<br>~~es~~<br>~~es es~~|-<br>0.05<br>0.20<br>~~es~~<br>~~es~~|-<br>0.05<br>0.20|% RNG<br>~~|~~|1<br>~~|SI~~|
|Total Error Band<br>~~ee ~~<br>~~a~~<br>~~a~~|TEB<br>~~es~~<br> ~~es~~<br>~~es es~~|-<br>0.15<br>0.30<br>~~es~~<br>~~es~~|-<br>0.25<br>0.40|% FSS<br>~~|~~|3<br>~~| SI~~|
|TEB After AZ<br>~~a~~|TEBAZ<br>~~es es~~|-<br>0.05<br>0.20<br>~~es~~|-<br>0.05<br>0.20|% FSS|7|
|Long Term Stability<br>~~a~~<br>~~a~~|LTS<br>~~es~~|-<br>0.10<br>0.25<br>~~es~~|-<br>0.15<br>0.35|% FSS/Yr|2|
|Thermal Hysteresis<br>~~a~~<br>~~a~~<br>~~a~~|THYS<br>~~es~~<br>~~es~~|-<br>0.05<br>-<br>~~es~~<br>~~es~~|-<br>0.10<br>-|% FSS||
|Pressure Hysteresis<br>~~a~~<br>~~a~~<br>~~a~~|PHYS<br>~~es~~<br>~~es~~<br>~~es es~~|-<br>0.05<br>-<br>~~es~~<br>~~es~~<br>~~es~~|-<br>0.05<br>-|% RNG|1|
|Supply Rejection<br>~~a~~<br>~~a~~<br>~~a~~|PSR<br>~~es~~<br>~~es es~~<br>~~es es~~|-<br>0.0005<br>-<br>~~es~~<br>~~es~~<br>~~es~~|-<br>0.0007<br>-|% FSS/mV||
|Output Resolution<br>~~a~~<br>~~a~~<br>~~a~~|RESOUT<br>~~es es~~<br>~~es es~~<br>~~es es~~|-<br>24<br>-<br>~~es~~<br>~~es~~<br>~~es~~|-<br>24<br>-|bit|4|
|Effective Resolution<br>~~a~~<br>~~a~~|RESEFF<br>~~es es~~<br>~~es es~~|-<br>17.2<br>-<br>~~es~~<br>~~es~~|-<br>16.2<br>-|BitRMS|5|
|Data Update Rate<br>~~a~~|fUPDATE<br>~~es es~~|1.05<br>1.09<br>1.12<br>~~es~~|1.05<br>1.09<br>1.12|kHz|6|



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DS-0008B.DOCX 

## VN Series 

## Ventilator Pressure Sensors 

## 6.3 Barometric Pressure (mbar Range) 

|**Parameter**<br>~~Le~~|**Sym**<br>~~eee~~<br>~~es~~|**VN-BARO**<br>~~eee Le~~|**Units**<br>~~Le~~|**Notes**<br>~~Le~~|
|---|---|---|---|---|
|||**Min**<br>**Typ**<br>**Max**<br>~~eee Le~~<br>~~CTT~~<br>~~es~~|||
|Accuracy<br>~~Le~~<br>~~ee~~|PACC<br>~~eee~~<br>~~ee~~<br>~~es~~<br>~~es~~|-<br>0.05<br>0.20<br>~~eee Le~~<br>~~CTT~~<br>~~ee~~<br>~~es~~|% FS<br>~~Le~~<br>~~ee~~|~~Le~~<br>~~ee~~|
|Total Error Band<br>~~ee~~<br>~~ee~~|TEB<br>~~ee~~<br>~~es ~~<br>~~ee~~<br>~~es~~<br>~~es~~|-<br>0.20<br>0.50<br>~~ee~~<br> ~~es~~<br>~~ee~~|% FS<br>~~ee~~<br>~~ee~~|3<br>~~ee~~<br>~~ee~~|
|Long Term Stability<br>~~ee~~<br>~~ee~~|LTS<br>~~ee~~<br>~~es~~<br>~~ee~~<br>~~es~~<br>~~es~~|-<br>0.10<br>0.25<br>~~ee~~<br>~~ee~~|% FS/Yr<br>~~ee~~<br>~~ee~~|2<br>~~ee~~<br>~~ee~~|
|Thermal Hysteresis<br>~~ee~~<br>~~ee~~|THYS<br>~~ee~~<br>~~es~~<br>~~ee~~<br>~~es~~<br>~~es es~~|-<br>0.10<br>-<br>~~ee~~<br>~~ee~~<br>~~es~~|% FS<br>~~ee~~<br>~~ee~~|~~ee~~<br>~~ee~~|
|Pressure Hysteresis<br>~~ee~~<br>~~ee~~|PHYS<br>~~ee~~<br>~~es~~<br>~~ee~~<br>~~es es~~<br>~~es~~|-<br>0.05<br>-<br>~~ee~~<br>~~ee~~<br>~~es~~<br>~~es~~|% FS<br>~~ee~~<br>~~ee~~|1<br>~~ee~~<br>~~ee~~|
|Supply Rejection<br>~~ee~~<br>~~ee~~|PSR<br>~~ee~~<br>~~es es~~<br>~~ee~~<br>~~es~~<br>~~es~~|-<br>0.0005<br>-<br>~~ee~~<br>~~es~~<br>~~ee~~<br>~~es~~<br>~~es~~|% FS/mV<br>~~ee~~<br>~~ee~~|~~ee~~<br>~~ee~~|
|Output Resolution<br>~~ee~~<br>~~ee~~|RESOUT<br>~~ee~~<br>~~es ~~<br>~~ee~~<br>~~es~~<br>~~es~~|-<br>24<br>-<br>~~ee~~<br> ~~es~~<br>~~ee~~<br>~~es~~<br>~~es~~|bit<br>~~ee~~<br>~~ee~~|4<br>~~ee~~<br>~~ee~~|
|Effective Resolution<br>~~ee~~<br>~~ee~~|RESEFF<br>~~ee~~<br>~~es ~~<br>~~ee~~<br>~~es~~<br>~~es~~|-<br>16.2<br>-<br>~~ee~~<br> ~~es~~<br>~~ee~~<br>~~es~~|BitRMS<br>~~ee~~<br>~~ee~~|5<br>~~ee~~<br>~~ee~~|
|Data Update Rate<br>~~ee~~<br>~~ee~~|fUPDATE<br>~~ee~~<br>~~es ~~<br>~~ee~~<br>~~es~~|1.05<br>1.09<br>1.12<br>~~ee~~<br> ~~es~~<br>~~ee~~|kHz<br>~~ee~~<br>~~ee~~|6<br>~~ee~~<br>~~ee~~|



1) Percentage of selected range. 

2) YR1 is the first year. The most significant drift occurs during the first year and is lessened for each subsequent year. For each subsequent year, use 25% of the prior years' drift figure to estimate the drift for that year. 

- 3) Includes errors of offset, span, hysteresis and thermal effects. 

- 4) Each selected range has the specified resolution 

5) Effective Resolution is stated for fBW set to 100 Hz. 

6) The internal update rate is fixed and does not change with range or filter settings. Sampling at lower data rates are possible, provided the Nyquist frequency is observed. It is suggested to sample at least 3x the set fBW frequency. 

7) Total error band within 24 hours of a sensor auto-zero. Includes all error components of TEB. 

## 7 Electrical Characteristics 

## 7.1 Supply Characteristics 

|**Parameter**|**Sym**|**VN026CM/VN131CM**|**VN025CM/VN130CM/**<br>**VN-BARO/VN150D/VN150A**|**Units**|**Notes**|
|---|---|---|---|---|---|
|||**Min**<br>**Typ**<br>**Max**|**Min**<br>**Typ**<br>**Max**|||
|Supply Current|IDD|-<br>9.0<br>11|-<br>5.5<br>6.5|mA||
|Supply Capacitance|CDD|-<br>10<br>-|-<br>10<br>-|uF|1|



1) Supply capacitance is provided within the part however it is recommended to include a 0.1 uF decoupling cap near the supply pads. 

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DS-0008B.DOCX 

## VN Series 

## Ventilator Pressure Sensors 

## 7.2 Reset Characteristics 

|**Parameter**<br>~~Pf},~~<br>~~a~~|**Sym**<br>~~Pf},~~|**Condition**<br>~~Pf},~~|**All VN Series Parts**<br>~~Pf},~~<br>~~_|_]f_~~|**Units**<br>~~Pf},~~<br>~~_|_]f_~~<br>~~ee~~|**Notes**<br>~~Pf},~~<br>~~_|_]f_~~<br>~~ee~~|
|---|---|---|---|---|---|
||||**Min**<br>**Typ**<br>**Max**<br>~~Pf},~~<br>~~_|_]f_~~|||
|Power-On Reset<br>Threshold<br>~~ee~~<br>~~a~~<br>~~a~~|VPORR<br>VPORF<br>~~ee~~<br>~~ee~~|Rising Voltage on VDD<br>FallingVoltage on VDD<br>~~ee~~<br>~~**ee**~~|-<br>0.75<br>1.4<br>-<br>-<br>1.36<br>~~_|_]f_~~<br>~~ee~~<br>~~e~~~~**e**~~|V<br>V<br>~~_|_]f_~~<br>~~ee~~<br>~~ee~~<br>~~ee~~|~~_|_]f_~~<br>~~ee~~<br>~~ee~~|
|Interface Detect<br>Delay<br>~~a~~<br>~~a~~<br>~~es~~|tIOD<br>~~ee~~<br>~~ee~~<br>|From POR or External<br>Reset<br>~~**ee**~~|-<br>-<br>40<br>~~e~~~~**e**~~<br>~~e~~|ms<br>~~ee~~<br>~~ee~~<br>~~ee~~|~~ee~~|
|First Response<br>SettlingTime<br>~~a~~<br>~~es~~<br>~~es~~|tFRD<br>~~ee~~<br>~~ee~~<br>~~es~~<br>|From POR or External<br>Reset<br>~~**ee**~~|-<br>-<br>55<br>~~e~~~~**e** ~~<br>~~e~~|ms<br> ~~ee~~<br>~~ee~~|1|
|External Reset Low<br>~~es~~<br>~~es~~<br>~~es~~|tRSTL<br>~~ee~~<br>~~es~~<br>~~ns~~<br>||15<br>-<br>-<br>~~e~~|us<br>~~ee~~||
|Input High Voltage<br>~~es ~~<br>~~es~~<br>~~es~~<br>~~a~~|VIH<br> ~~es~~<br>~~ns~~<br>ns||VDD-0.6<br>-<br>-|~~ee~~|2|
|Input Low Voltage<br> <br>~~es ~~<br>~~es~~<br>~~a~~<br>~~es~~|VIL<br> ~~es~~<br> ~~ns~~<br>ns<br>~~ee~~<br>|~~ee~~<br>|-<br>-<br>0.6<br>~~ee~~|~~ee~~<br>~~ee~~|2<br>~~ee~~|
|Internal Pull-Up<br>Current<br> <br>~~es ~~<br>~~a~~<br>~~es~~|IPU<br> ~~ns~~<br> ns<br>~~ee~~<br>~~es~~|VIN= 0V<br>~~ee~~<br>~~ns~~|-<br>-10<br>-30<br>~~ee~~|uA<br>~~ee~~<br>~~ee~~|2<br>~~ee~~|
|Input Capacitance<br>~~es~~|CIN<br>~~ee~~<br>~~es~~|~~ee~~<br>~~ns~~|-<br>7<br>-<br>~~ee~~|pF<br>~~ee~~<br>~~ee~~|2<br>~~ee~~|



1) The filter settling time to ensure the first reading is completely settled. 

2) Input nRST 

## 7.3 DAV Characteristics 

|**Parameter**|**Sym**|**Condition**|**All VN Series Parts**|**Units**|**Notes**|
|---|---|---|---|---|---|
||||**Min**<br>**Typ**<br>**Max**|||
|Output High Voltage|VOH|IO= -3 mA|VDD-0.7<br>-<br>-|V||
|Output Low Voltage|VOL|IO= 8 mA|-<br>-<br>0.6|V||



## 7.4 I[2] C Characteristics 

|**Parameter**|**Sym**|**Condition**|**All VN Series Parts**|**Units**|**Notes**|
|---|---|---|---|---|---|
||||**Min**<br>**Typ**<br>**Max**|||
|SCL Clock Frequency|fSCL||100<br>-<br>400|kHz||
|Clock Stretch Time|tCKSTR||-<br>10<br>25|us||
|Input High Voltage|VIH||VDD-0.6<br>-<br>-|||
|Input Low Voltage|VIL||-<br>-<br>0.6|||
|Output Low Voltage|VOL|IO= 8 mA|-<br>-<br>0.6|V||
|Input Capacitance|CIO||-<br>7<br>-|pF||



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## VN Series 

## Ventilator Pressure Sensors 

## 7.5 SPI Characteristics 

|**Parameter**<br>~~Pf},~~<br>~~es~~<br>~~es~~|**Sym**<br>~~Pf},~~<br>~~es~~<br>|**Condition**<br>~~Pf},~~|**All VN Series Parts**<br>~~Pf},~~<br>~~_|_]f_~~|**Units**<br>~~Pf},~~<br>~~_|_]f_~~|**Notes**<br>~~Pf},~~<br>~~_|_]f_~~|
|---|---|---|---|---|---|
||||**Min**<br>**Typ**<br>**Max**<br>~~Pf},~~<br>~~_|_]f_~~|||
|Output High Voltage<br>~~es~~<br>~~es~~<br>~~es~~|VOH<br>~~es~~<br>~~ns~~<br>|IO= -3 mA|VDD-0.7<br>-<br>-<br>~~_|_]f_~~|V<br>~~_|_]f_~~|1<br>~~_|_]f_~~|
|Output Low Voltage<br>~~es ~~<br>~~es~~<br>~~es~~<br>~~es~~|VOL<br> ~~es~~<br>~~ns~~<br>~~ns~~<br>|IO= 8 mA|-<br>-<br>0.6<br>~~_|_]f_~~|V<br>~~_|_]f_~~|1<br>~~_|_]f_~~|
|Input High Voltage<br> <br>~~es ~~<br>~~es~~<br>~~es~~<br>~~a~~|VIH<br> ~~es~~<br> ~~ns~~<br>~~ns~~<br>ns||VDD-0.6<br>-<br>-||2, 3|
|Input Low Voltage<br> <br>~~es ~~<br>~~es~~<br>~~a~~<br>~~a~~|VIL<br> ~~ns~~<br> ~~ns~~<br>ns<br>~~ee~~|~~ee~~|-<br>-<br>0.6<br>~~ee~~|~~ee~~<br>~~ee~~|2, 3<br>~~ee~~|
|Internal Pull-Up<br>Current<br> <br>~~es ~~<br>~~a~~<br>~~a~~<br>~~es~~|IPU<br> ~~ns~~<br> ns<br>~~ee~~<br>~~ee~~<br>|VIN= 0V<br>~~ee~~<br>~~ee~~|-<br>-10<br>-30<br>~~ee~~<br>~~ee~~|uA<br>~~ee~~<br>~~ee~~<br>~~ee~~<br>~~ee~~|2, 3<br>~~ee~~<br>~~ee~~|
|Time nSS to First<br>SCK Edge<br>~~a~~<br>~~es~~<br>~~a~~|tSC<br>~~ee~~<br>~~ee~~<br>ns|~~ee~~<br>~~ee~~|30<br>-<br>-<br>~~ee~~<br>~~ee~~|us<br>~~ee~~<br>~~ee~~<br>~~ee~~<br>~~ee~~|~~ee~~<br>~~ee~~|
|Clock Cycle Time<br>~~es~~<br>~~a~~<br>~~a~~|tCC<br>~~ee ~~<br>ns<br>~~ee~~|~~ee~~<br>~~ee~~|1<br>-<br>-<br>~~ee~~<br>~~e~~~~**e**~~|us<br>~~ee~~<br>~~ee~~|~~ee~~|
|Byte to Byte Cycle<br>Time<br>~~es ~~<br>~~a~~<br>~~a~~<br>~~es~~|tBC<br> ns<br>~~ee~~<br>~~ee~~<br>|~~ee~~<br>~~ee~~|25<br>-<br>-<br>~~e~~~~**e**~~<br>~~e~~|us<br>~~ee~~<br>~~ee~~||
|Time Last Clock to<br>nSS High<br>~~a~~<br>~~es~~<br>~~es~~|tCN<br>~~ee~~<br>~~ee~~<br>~~**es**~~|~~ee~~<br>~~ee~~<br>~~nn~~|5<br>-<br>-<br>~~e~~~~**e**~~<br>~~e~~|us<br>~~ee~~||
|Cycle Time nSS<br>~~a~~<br>~~es~~<br>~~es~~|tCS<br>~~ee ~~<br>~~ee~~<br>~~**es**~~|~~ee~~<br>~~ee~~<br>~~nn~~<br>~~ns~~|5<br>-<br>-<br>~~e~~~~**e**~~<br>~~e~~|us<br>~~ee~~||
|Input Capacitance<br>~~es ~~<br>~~es~~|CIN<br> ~~**es**~~|~~nn~~<br>~~ns~~|-<br>7<br>-|pF<br>~~ee~~|2|



1) Output MOSI 

2) Inputs MISO, SCK, nSS 

3) Inputs are 5V compliant. 

## 8 Materials 

## 8.1 Wetted Materials 

|**Parameter**|**Sym**|**VN026CM/VN131CM**|**VN026CM/VN131CM**|**VN025CM/VN130CM/**<br>**VN-BARO/VN150D/VN150A**|**VN025CM/VN130CM/**<br>**VN-BARO/VN150D/VN150A**|**Units**|**Notes**|
|---|---|---|---|---|---|---|---|
|||**PA**|**PB**|**PA**|**PB**|||
|Wetted Materials|MATWET|Epoxy<br>Nylon<br>RTV<br>Silicon<br>Gold<br>Aluminum|Epoxy<br>Nylon<br>RTV<br>Silicon<br>Gold<br>Aluminum|Epoxy<br>Nylon<br>RTV<br>Silicon|Epoxy<br>Nylon<br>RTV<br>Silicon<br>Gold<br>Aluminum|||



## 8.2 Material Compliance 

|**Parameter**|**Sym**|**All VN Series Parts**|**Units**|**Notes**|
|---|---|---|---|---|
|RoHS|REGRoHS|RoHS Compliant|||
|REACH|REGREAC|REACH Compliant|||



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## VN Series 

## Ventilator Pressure Sensors 

## 9 System Overview 

The VN Series pressure sensor is a fully integrated pressure acquisition system in a sensor module. The acquisition system includes anti-alias filters, data acquisition, sensor compensation, bandwidth limiting and I/O functions. Refer to the figure below for the VN Series block diagram. 

**==> picture [500 x 206] intentionally omitted <==**

**----- Start of picture text -----**<br>
User Control Registers<br>Pressure Anti-Alias  Δ-Sigma  Mode Control Rate Control<br>Sensor Filter Modulator<br>DAV<br>Range  BW  Rate  HW<br>3b Control 3b Control Controller Interface nRST<br>Va Anti-Alias  Δ-Sigma<br>Filter Modulator MISO/SDA<br>4 Compensation 4 BW Limit SPI/I [2] C  MOSI/SCL<br>Decimation FPU with IIR SCK<br>Linearization (2 [nd]  Order) Interface nSS<br>Se at [GN<br>T [o] SAR ADC<br>OE<br>26 Term<br>Compensation<br>Coefficients<br>Vs<br>SAR ADC<br>MCU<br>OE<br>FIG-0102A<br>**----- End of picture text -----**<br>


There are also two user controlled registers that tune the sensor to the specific user requirements.  The first register is the Mode Control register that determines the output pressure range and the corner frequency of the bandwidth limiting filter. 

The second register is the Rate Control register which controls the rate at which the Data Available (DAV) pin is asserted. The internal sensor data update rate of 1.09 kHz is used to generate a rising edge on the DAV line signaling the host there is a new pressure reading that is available. The rate control register is used to divide the update frequency by "n" to slow the DAV indication rate to the host. For example, a divide by one causes the DAV to be set at each internal update. A divide by two will cause a DAV signal to be asserted every second internal update etc. The rate control register maximum value is 255 so using this value will assert the DAV once for every 255 internal updates. 

**==> picture [273 x 103] intentionally omitted <==**

**----- Start of picture text -----**<br>
Rate Control<br>Register<br>Reload Value<br>Internal Update  Zero DAV<br>Down Counter S Q<br>(fUPDATE)<br>Data Read<br>R FIG-0012B<br>**----- End of picture text -----**<br>


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VN Series 

## Ventilator Pressure Sensors 

## 10 Interface 

## 10.1 Reset 

Reset timing is shown in the diagram below. 

The communications method (SPI or I[2] C) is established during the time just after reset. During this time (tIOD), no communications should take place. 

Also, the internal filters are settling during the time tFRD and data acquired during this time may not be fully settled. 

**==> picture [410 x 191] intentionally omitted <==**

**----- Start of picture text -----**<br>
 Reset Timing Diagram<br>VDD VPORR VPORF<br>Internal Reset<br>tRSTL<br>_RST<br>tIOD tIOD<br>Communications<br>Available<br>tFRD tFRD<br>Filters Settled<br>FIG-0021A<br>**----- End of picture text -----**<br>


## 10.2 Communication Interface Selection 

The communications interface is selected by interrogating the nSS pin after the internal power on reset delay. If nSS is high, the SPI interface will be selected otherwise (if low) the I[2] C interface will be selected. Grounding the nSS pin is an acceptable method for selecting the I[2] C interface. NOTE: The I[2] C interface supports 10 interface addresses. Refer to section 10.4.1 for the details on I[2] C address selection. 

For both the SPI and I[2] C interface, all data transfers are MSB first (reading and writing). 

## 10.3 SPI Interface 

The SPI interface uses spi mode 1. That is clock idle low with data read on the second (falling) clock edge. Refer to the figure below for specific timing requirements. Note: A two byte transfer is shown for timing purpose only. This is extensible as determined by the desired data to be retrieved from the sensor. 

**==> picture [433 x 104] intentionally omitted <==**

**----- Start of picture text -----**<br>
 SPI Timing Diagram<br>tsc tcc tbc tcn tcs<br>SCK<br>MOSI OOO Bit 7 OCX Bit 6 CUXLCLCUXLCUXCUXCUX Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 CX Bit 0 CKCX Bit 7 CX Bit 6 KX Bit 5 KX Bit 4 XX Bit 3 Bit 2 XK Bit 1 PT Bit 0<br>MISO eee Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 ee<br>nSS<br>**----- End of picture text -----**<br>


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## VN Series 

## Ventilator Pressure Sensors 

Each communication cycle consists of master sending the Mode and Rate data to be placed into the sensor Mode Register and Rate Registers respectively. Simultaneously, the sensor sends the pressure data for the master to receive. Refer to the figure below for the data communication model of the VN Series sensor. 

The requirement to send the Mode and Rate bytes on each data read cycle is intentional. The purpose is to force the master to send specific data for each communication and prevent inadvertent data from being sent to the sensor. Since a SPI interface will generally re-circulate data through its shift register, the intention is to prevent the pressure output from the sensor from being re-circulated back to the sensor and potentially causing unintended corruption of the internal mode register. 

Any number of bytes can be transferred using this model. It is only required that the first two bytes of the transfer include the Mode and Rate bytes being sent via the MOSI line. Subsequent bytes (byte 3, 4 etc) do not require specific data on the MOSI and will be ignored. 

**==> picture [357 x 95] intentionally omitted <==**

**----- Start of picture text -----**<br>
 SPI Data Diagram<br>SCK T ULL LLL<br>MOSI AANA  User Mode Byte aS (iTS  User DAV Byte i)ns Don’t care (i)(AA Don’t care HAICICNANIIIHANIIN<br>MISO DF Mode Byte Used Pressure High Byte Pressure Mid Byte Pressure Low Byte<br>nSS iLeLO<br>FIG-0146A<br>**----- End of picture text -----**<br>


## 10.4 I[2] C Interface 

The VN Series is compatible with the I[2] C protocol. For detailed information regarding the I[2] C protocol, please refer to the Philips I[2] C Bus Specification, Version 2. 

## 10.4.1 I[2] C Address 

|I2C Address Selection Table|I2C Address Selection Table|I2C Address Selection Table|I2C Address Selection Table|
|---|---|---|---|
|R1 (kΩ)|R2 (kΩ)|Address<br>(decimal)|Address<br>(hex)|
|120|5.6|49|0x31|
|120|12|48|0x30|
|120|27|47|0x2F|
|120|51|46|0x2E|
|120|100|45|0x2D|
|56|100|44|0x2C|
|30|100|43|0x2B|
|15|100|42|0x2A|
|5.6|100|41|0x29|
|0|NoPop|40|0x28|



The I[2] C address is set to 0x28 by grounding the SCK line. Other I[2] C addresses can be established by applying a voltage to the SCK line by use of a resistor divider across the sensor supply voltage. The suggested resistor values and the respective I[2] C address are shown in the table to the left. 

Note: R1 is the lower resister of the divider where R2 is the upper resistor of the divider. 

## 10.4.2 I[2] C Communications Model 

The sensor is configured as a slave device and as such, the communicating host must be configured as a master. There are two types of possible data transfers, data transfers from the master transmitter to an addressed sensor (WRITE), and data transfers from an addressed sensor to a master receiver (READ).  The master device initiates both types of data transfers and provides the serial clock pulses on SCL. 

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## VN Series 

## Ventilator Pressure Sensors 

The communications model for I[2] C is similar to that of SPI however, since I[2] C is a half-duplex protocol, the transfer of information to and from the sensor is separated into two individual communications. This is in contrast to the SPI interface where the transmitted and received data occurs simultaneously to and from the host. Refer to the figure to the right for the data communication model for the VN Series sensors. 

**==> picture [71 x 6] intentionally omitted <==**

**----- Start of picture text -----**<br>
  I [2] C Communication Model<br>**----- End of picture text -----**<br>


**==> picture [383 x 162] intentionally omitted <==**

**----- Start of picture text -----**<br>
(1) Setting Mode Control Register Only<br>Slave Address [6:0] Write DataByte 1<br>User Mode Byte [7:0]<br>(2) Setting Both Control Registers<br>Slave Address [6:0] Write DataByte 1 Data Byte 2<br>User Mode Byte [7:0] User Rate Byte [7:0]<br>(3) Reading Pressure Data<br>PLE ELL AE Se Se Ee<br>a Slave Address [6:0] Read  0 DataByte 1  OO Data Byte 2 Data Byte 3 Data Byte 4<br>a Mode Used [7:0] Pressure Output [23:16] Pressure Output [15:8] Pressure Output [7:0]<br>Bits generated by Master Bits generated by Sensor<br>Oo H<br>Start A6 A5 A4 A3 A2 A1 A0 0 ACK D7 D6 D5 D4 D3 D2 D1 D0 ACK Stop<br>Start A6 A5 A4 A3 A2 A1 A0 0 ACK D7 D6 D5 D4 D3 D2 D1 D0 ACK D7 D6 D5 D4 D3 D2 D1 D0 ACK Stop<br>Start A6 A5 A4 A3 A2 A1 A0 1 ACK D15 D14 D13 D12 D11 D10 D9 D8 ACK D7 D6 D5 D4 D3 D2 D1 D0 ACK D7 D6 D5 D4 D3 D2 D1 D0 ACK D7 D6 D5 D4 D3 D2 D1 D0 NACK Stop<br> FIG-0145A<br>**----- End of picture text -----**<br>


## 10.4.3 I[2] C Clock Stretching 

The figure to the right illustrates the I[2] C clock stretching by the sensor. At times, the sensor requires additional time to respond to the host and utilizes the clock stretching feature of the I[2] C protocol. This is accomplished by holding the SCL low after the ACK cycle of a data transfer. Refer to Section 7.4 for the clock stretching timing. Note, the maximum clock stretch time will generally only occur once during the three ACK cycles of a two byte transfer. That is, the balance of ACK's during a multi-byte transfer will generally include the typical clock stretching time. 

## 10.4.4 I[2] C Bus Compatibility 

The I[2] C specification allows any recessive voltage between 3.0 and 5.0 V. Different devices on the bus may operate at different voltage levels. However, the maximum voltage on any port pin must conform to the electrical characteristics specifications (See section 1). The bi-directional SCL (serial clock) and SDA (serial data) lines must be connected to a positive power supply voltage through a pull-up resistor or similar circuit. Every device connected to the bus must have an open-drain or open-collector output for both the SCL and SDA lines, so that both are pulled high (recessive state) when the bus is free. 

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## VN Series Ventilator Pressure Sensors 

## 10.5 Extended Data Acquisition 

## 10.5.1 Available Extended Data 

For either the SPI or I[2] C interface, additional data is available beyond the pressure. The means to access this extended data is to continue reading data (either SPI or I[2] C) beyond the 24 bits of pressure information. The following table defines the order of the available data and respective format. 

|**Data**|**Bytes**|**Format**|**Interpretation**|**Example**|
|---|---|---|---|---|
|Mode|1|8 bit, Encoded|See Section 10.6|See Section 10.6|
|Pressure|2-4|3 byte, Unsigned<br>Int|See Section 10.7|See Section 10.7|
|Temperature|5-6|2 byte, Signed Int|Fixed Decimal [8.8 bits], Upper 8<br>bits integer, lower 8 bits<br>fractional. Temperature in °C|1880H (18.80H) = 24.5°C|
|Model|7-14|8 byte, ASCII, null<br>terminated|Right reading ASCII with null<br>termination|56H,4EH,30H,32H,36H,43H,4DH,00H =<br>VN026CM|
|Serial Number|15-18|4 byte, Hex|Unique 4 byte serial for each part|2FD627A4H|
|Build Number|19-24|6 byte, ASCII, null<br>terminated|Right reading ASCII with null<br>termination|30H,31H,39H,37H,41H,00H = 0197A|



## 10.5.2 SPI Extended Data Read 

Reading the extended data while using the SPI interface is the same as shown in Section 10.3 with exception that the master continues to read during the same nSS sequence to read all 24 bytes of the extended data. Any portion of the 24 bytes can be read during the transfer. That is, for example, 6 bytes could be read to acquire only the pressure and temperature information.  When reading the extended data, only the first two bytes sent to the sensor (User Mode and User Rate) are used to set the internal registers. The subsequent bytes (bytes 5 through 24) are ignored. Data read following the first 24 bytes is undefined. 

## 10.5.3 I[2] C Extended Data Read 

Reading the extended data via the I[2] C interface is similar to using the SPI interface where the master can simply continue to reading the sensor during the pressure reading transfer. The master continues Ack'ing until the number of desired bytes are read. 

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## VN Series 

## Ventilator Pressure Sensors 

## 10.6 Control Registers 

10.6.1 Mode Control Register Default Value: 0x3F 

Details of the Mode Control register are illustrated in the figure to the right. 

Bits 0-2 control the output pressure range. 

Bits 3-5 control the BW Limit Filter. 

Bit 6-7 is reserved. 

Please note the available pressure ranges for the different sensor models are indicated in the table. For values where the pressure range is not available for the given sensor, the table is highlighted in light orange and indicates the given full scale value to use for pressure conversion. It is possible to use these values. 

It should also be noted that upon changing the Mode Control value, there is a one cycle latency before the new Mode Control value becomes valid. That is, the data of the communication cycle following a change to the Mode Control register will not reflect the change. It is not until the second communication cycle that the change in the Mode Control register will be reflected in the output data. 

## Mode Control Register Detail 

|||||Mode Register (General)|Mode Register (General)|Mode Register (General)|Mode Register (General)|Mode Register (General)|Mode Register (General)|Mode Register (General)|Mode Register (General)|Mode Register (General)|Mode Register (General)|Mode Register (General)||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
||b7||b6||b5||b4||b3|||b2||b1||b0||||||||
|||||||||||||||||||||||||
|||||||||||||||||||||||||
||||||||||||||||||Pressure Range Select<br>BW Limit Select|||||||
||||||||||||||||||Reserved|||||||
|||||||||||||||||||||||||
|||||Mode Register (Detail)|||||||Mode Register (Detail)|||||||||||||
||b7||b6||b5||b4||b3|||b2||b1||b0||||||||
|||||||||||||||||||||||||
|||||||||||||0<br>0<br>0<br>0<br>0<br>1<br>0<br>1<br>0<br>0<br>1<br>1<br>1<br>0<br>0<br>Pressure Range Select (by Model)<br>VN025CM<br>(cmH2O)<br>±5.0<br>±7.5<br>±10.0<br>VN026CM<br>(cmH2O)<br>VN130CM<br>(cmH2O)<br>±80<br>±80<br>±90<br>±100<br>±80<br>VN131CM<br>(cmH2O)<br>VN-BARO<br>(mbar)<br>VN150A<br>(psia)<br>VN150D<br>(psid)<br>±80<br>±100<br>±110<br>±120<br>±90<br>±5.0<br>± 5.0<br>±5.0<br>±7.5<br>±10.0<br>±2.5<br>±2.5<br>±60<br>±80<br>±90<br>±100<br>±70<br>600-1100<br>700-1100<br>800-1100<br>800-1100<br>800-1100<br>0-80<br>0-100<br>0-110<br>0-120<br>0-90<br>~~CT~~<br>tT TT [Tt fy fT<br>TTnha<br>fo |<br>a<br>PPPPtC<br>PPPe_~~ti~~<br>a||||||||||||
||||||||||||1<br>0<br>1<br>1<br>1<br>0<br>1<br>1<br>1<br>±15.0<br>±20.0<br>±25.0<br>±110<br>±120<br>±130<br>350-1100<br>0-150<br>±130<br>±140<br>±150<br>±15.0<br>±20.0<br>±25.0<br>±110<br>±120<br>±130<br>400-1100<br>500-1100<br>0-130<br>0-140<br>a<br>OnPPP|||||||||||||
|||||||||||||||||||||||||
||||||||||||||||||BW Limit Select by Model|||BW Limit Select by Model||||
||||||||||||||||||VN025CM<br>VN026CM<br>VN130CM||VN131CM|VN-BARO|VN150A||VN150D|
||||||0||0||0||||||||20 Hz||||1 Hz|||
||||||0||0||1||||||||50 Hz||||5 Hz|||
||||||0||1||0||||||||100 Hz||||10 Hz|||
||||||0||1||1||||||||200 Hz||||25 Hz|||
||||||1||0||0||||||||300 Hz||||50 Hz|||
||||||1||0||1||||||||350 Hz||||100 Hz|||
||||||1||1||0||||||||400 Hz||||200 Hz|||
||||||1||1||1||||||||500 Hz||||300 Hz|||
|x<br>x<br>(T|||||||||||||||||Reserved<br>Cd|||||||



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## VN Series 

## Ventilator Pressure Sensors 

## 10.6.2 Rate Control Register 

## Default Value: 0x01 

The Rate Control Register controls the rate at which the DAV pin is asserted indicating new data is available. This register is primarily used to throttle down the actual data transfer rate (when using the DAV as the trigger to sample). This can be used to have the sensor interrupt the host at a given data rate and synchronize the sensor data stream to the application. 

The function of this register is that it is the reload value of a data rate counter. The value of the Rate Control Register is the divisor of the 1.09 kHz internal data rate. Since a divisor of zero is not possible, a zero value replicated the fasted available data rate (highlighted in orange). 

Note: Start-up time (tFRD) for the sensor is approximately 55ms for the first sample to be settled. Requesting data during this time will result in invalid information. However, the time between interface detection (tIOD) and the 

Rate Control Register Detail 

**==> picture [191 x 142] intentionally omitted <==**

**----- Start of picture text -----**<br>
Rate Control Register<br>b7 b6 b5 b4 b3 b2 b1 b0<br>0 0 0 0 0 0 0 0 1087.5 Hz<br>0 0 0 0 0 0 0 1 1087.5 Hz<br>0 0 0 0 0 0 1 0 543.8 Hz<br>0 0 0 0 0 0 1 1 363.5 Hz<br>1 1 1 1 1 1 1 0 4.28 Hz<br>1 1 1 1 1 1 1 1 4.26 Hz<br>FIG-0144A<br>**----- End of picture text -----**<br>


start-up time tFRD) can be used for configuring the Mode and Rate registers by performing a transfer with the desired Mode and Rate register values and discarding the received pressure data. After waiting the required start-up time, the sensor will respond with desired data since the Mode and Rate registers have been pre-established. 

## 10.7 Computing Pressure 

The pressure data is in the form of 24 bit unsigned integer sent in the order of high byte then two lower bytes (big endian). 

The selected range of each sensor is scaled into ninety percent (90%) of the digital output range (5% at either end of the 24 bit digital range). Refer to the figure at right for the transfer function of the VN Series by sensor model. Also see Section 10.6.1 for the available pressure ranges of the specific VN Series sensor models. 

Examples of converting the digital output for the different sensor types are illustrated below. 

For a differential sensor (VN026CM) set to a range of ±20 cmH2O: 

**==> picture [220 x 20] intentionally omitted <==**

For an absolute sensor (VN150A) set to a range of 0-130 psia: 

**==> picture [199 x 20] intentionally omitted <==**

For a barometric sensor (VN-BARO) set to a range of 4000-1100 mbar: 

**==> picture [243 x 201] intentionally omitted <==**

**----- Start of picture text -----**<br>
2 [24]  - 1<br>(2 [24]  – 1) * 95%<br>(2 [24]  – 1) * 50%<br>(2 [24]  – 1) * 5%<br>0<br>-Prange 0 Prange Differential Sensors<br>0 Prange Abolute Sensor<br>Prange.min Prange.max Barometric Sensor<br>Applied Pressure<br>Differential Sensors: VN025CM, VN026CM, VN130CM, VN131CM, VN150D<br>Abolute Sensor: VN150A<br>Barometric Sensor: VN-BARO<br>Digital Output<br>FIG-0151A01<br>**----- End of picture text -----**<br>


**==> picture [332 x 20] intentionally omitted <==**

Or, a generic model can be used: 

**==> picture [357 x 19] intentionally omitted <==**

Note: To reduce computation time, only the upper 16 bits can be used (with lower resolution) to compute the pressure. That is, stop reading pressure data after the first two pressure bytes. In this case, substitute 2[16] for 2[24] and 2[15] for 2[23] respectively in the example equations. 

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## VN Series Ventilator Pressure Sensors 

## 11 Mechanical and Manufacturing 

## 11.1 Package Dimensions 

## 11.2 Suggested Pad Layout 

The suggested pad layout is shown in the figure below. An Eagle PCB symbol library is available with the shown pad dimensions. Please consult the factory to obtain the library. 

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## VN Series 

## Ventilator Pressure Sensors 

## 11.3 Pinout 

|**Pin**|**Sym **|**SPI**|**I**~~**2**~~**C**|
|---|---|---|---|
|1|nSS|Slave Select<br>(active low)|Tie to Ground|
|2|MOSI/SCL|MOSI|SCL|
|3|MISO/SDA|MISO|SDA|
|4|SCK|Serial Clock|See Section 10.4.1|
|5|DNC|Do Not Connect||
|6|DNC|Do Not Connect||
|7|DNC|Do Not Connect||
|8|Gnd|Ground||
|9|VDD|Sensor Supply||
|10|nRST|Reset(active low)||
|11|DAV|Data Available||



## 11.4 Reflow Soldering and Handling Conditions 

|**Parameter**|**Sym **|**Val**|**Units**|
|---|---|---|---|
|Soldering Specifications (Max)1, 2<br>Preheat Ramp Rate<br>Soak Time<br>Time Above 217C<br>Time Above 230C<br>Time Above 250C<br>Peak Temperature<br>CoolingRampRate|tPHRR<br>tSOAK<br>tGT217<br>tGT230<br>tGT250<br>tPT<br>tCRR|3<br>3<br>50<br>40<br>15<br>255<br>-4|°C/s<br>min<br>s<br>s<br>s<br>°C<br>°C/s|
|Weight|WPRT|3.5|gm|
|Moisture Sensitivity|MSL|3||
|ESD (Human Body Model)|ESD|2|kV|



Note 1) For lowest possible offset shift due to reflow, it is suggested to use a a low temperature lead free solder. Note 2) Presssure ports should not be exposed to cleaning agents. A no-clean solder is recommended. 

## 11.5 Pick and Place Pick-up Zone 

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## VN Series Ventilator Pressure Sensors 

## 11.6 Packaging Options 

## 11.6.1 Tray Packaging 

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## VN Series Ventilator Pressure Sensors 

## 11.6.2 Tape and Reel 

## 11.7 Part Identification 

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## VN Series 

## Ventilator Pressure Sensors 

## 12 Packaging Labeling 

Packaging labels are provided with barcode Code 128 symbology. The provided fields are Company Name, Part Number, Packaging ID and Quantity. The Packaging ID traces back to the Lot Number (or Lot Numbers) contained in the package. The purpose is to eliminate multiple labels (one for each included Lot Number) in the event of multiple Lot Numbers within a single package. This is for ease of customer tracking and maintenance. The Packaging ID is a 24 bit value printed in hexadecimal format. 

## 13 Ordering Information 

|**Part Number**|**Part**<br>**Package **|**Packaging**|**Packaging**<br>**Qty**|**Order Number**|
|---|---|---|---|---|
|VN025CM-SM03|SM03|Tape and Reel<br>Multi-Tray<br>Single Tray<br>Quarter Reel<br>Cut Tape|256<br>512<br>64<br>64<br>1-63|VN025CM-SM03-R<br>VN025CM-SM03-M<br>VN025CM-SM03-T<br>VN025CM-SM03-Q<br>VN025CM-SM03-C|
|VN026CM-SM03|SM03|Tape and Reel<br>Multi-Tray<br>Single Tray<br>Quarter Reel<br>Cut Tape|256<br>512<br>64<br>64<br>1-63|VN026CM-SM03-R<br>VN026CM-SM03-M<br>VN026CM-SM03-T<br>VN026CM-SM03-Q<br>VN026CM-SM03-C|
|VN130CM-SM03|SM03|Tape and Reel<br>Multi-Tray<br>Single Tray<br>Quarter Reel<br>Cut Tape|256<br>512<br>64<br>64<br>1-63|VN130CM-SM03-R<br>VN130CM-SM03-M<br>VN130CM-SM03-T<br>VN130CM-SM03-Q<br>VN130CM-SM03-C|
|VN131CM-SM03|SM03|Tape and Reel<br>Multi-Tray<br>Single Tray<br>Quarter Reel<br>Cut Tape|256<br>512<br>64<br>64<br>1-63|VN131CM-SM03-R<br>VN131CM-SM03-M<br>VN131CM-SM03-T<br>VN131CM-SM03-Q<br>VN131CM-SM03-C|
|VN-BARO-SM03|SM03|Tape and Reel<br>Multi-Tray<br>Single Tray<br>Quarter Reel<br>Cut Tape|256<br>512<br>64<br>64<br>1-63|VN-BARO-SM03-R<br>VN-BARO-SM03-M<br>VN-BARO-SM03-T<br>VN-BARO-SM03-Q<br>VN-BARO-SM03-C|
|VN150A-SM03|SM03|Tape and Reel<br>Multi-Tray<br>Single Tray<br>Quarter Reel<br>Cut Tape|256<br>512<br>64<br>64<br>1-63|VN150A-SM03-R<br>VN150A-SM03-M<br>VN150A-SM03-T<br>VN150A-SM03-Q<br>VN150A-SM03-C|
|VN150D-SM03|SM03|Tape and Reel<br>Multi-Tray<br>Single Tray<br>Quarter Reel<br>Cut Tape|256<br>512<br>64<br>64<br>1-63|VN150D-SM03-R<br>VN150D-SM03-M<br>VN150D-SM03-T<br>VN150D-SM03-Q<br>VN150D-SM03-C|



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VN Series 

## Ventilator Pressure Sensors 

## 14 Revisions 

|**Rev**|**Change Description(s)**|**Date**|**By**|
|---|---|---|---|
|A|Initial Release|11/22/22|T.S.|
|B|Revised 24 bit interface from signed to unsigned output.<br>Add recommendation note to soldering profile table.<br>Corrected miscellaneous typos.|3/8/23|T.S.|



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