# Pressure Sensor, 2 bar, Digital, 3.6 V, O-Ring Seal, 20.09 mA

![Product image](https://novapart.co/image/farnell:3397831/)

**URL**: https://novapart.co/products/MS580502BA01-50/pressure-sensor-2-bar-digital-36-v-o-ring-seal
**SKU**: MS580502BA01-50
**Manufacturer**: TE CONNECTIVITY
**Category**: Sensors & Transducers || Sensors || Pressure Sensors, Transducers || Pressure Transducers
**Price**: €10.6400
**Stock**: 1000+
**Lead Time**: 2 days (indicative)

## Specifications

| Parameter | Value |
|---|---|
| Port Style | O-Ring Seal |
| Product Range | MS5805-02BA01 Series |
| Sensor Output | Digital |
| Supply Current | 20.09mA |
| Voltage Rating | 3.6V |
| Operating Pressure Max | 2bar |

## Datasheet

📄 [Download PDF](https://novapart.co/datasheet/farnell:3397831/)

## MS5805-02BA01 

## Miniature Altimeter Module 

## SPECIFICATIONS 

- **High resolution module, 20 cm** 

- **Fast conversion down to 0.5 ms** 

- **Low power, 0.6 µA (standby < 0.15 µA at 25°C)** 

- **Integrated digital pressure sensor (24 bit ΔΣ ADC)** 

- **Supply voltage 1.8 to 3.6 V** 

- **Operating range: 300 to 1200 mbar, -40 to +85 °C** 

- **Extended pressure range: 10 to 2000 mbar** 

- **I[2] C interface** 

- **No external components (Internal oscillator)** 

- **Excellent long term stability** 

- **Sealing designed for 2.5 x 1mm O-ring** 

The MS5805-02BA is a new generation of high-resolution altimeter sensors from MEAS Switzerland with I[2] C bus interface. It is optimized for altimeters and variometers with an altitude resolution of 20 cm. The sensor module includes a high-linearity pressure sensor and an ultra low power 24 bit ΔΣ ADC with internal factory-calibrated coefficients. It provides a precise digital 24 Bit pressure and temperature value and different operation modes that allow the user to optimize for conversion speed and current consumption. A high-resolution temperature output allows the implementation of an altimeter/thermometer function without any additional sensor. The MS5805-02BA can be interfaced to virtually any microcontroller. The communication protocol is simple, without the need of programming internal registers in the device. This new sensor module generation is based on leading MEMS technology and latest benefits from MEAS Switzerland proven experience and know-how in high volume manufacturing of altimeter modules, which have been widely used for over a decade. The sensing principle employed leads to very low hysteresis and high stability of both pressure and temperature signal. 

SENSOR SOLUTIONS ///MS5805-02BA01 

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MS5805-02BA01 Miniature Altimeter Module 

## FEATURES 

## **FIELD OF APPLICATION** 

- Mobile altimeter / barometer systems 

- Bike computers 

- Adventure or multi-mode watches 

- Variometers 

- Dataloggers 

## **TECHNICAL DATA** 

|**Sensor Performances (VDD = 3 V)**|**Sensor Performances (VDD = 3 V)**|**Sensor Performances (VDD = 3 V)**|**Sensor Performances (VDD = 3 V)**|**Sensor Performances (VDD = 3 V)**|
|---|---|---|---|---|
|**Pressure**|**Min**|**Typ**|**Max**|**Unit**|
|Range|10||2000|mbar|
|ADC|24|||bit|
|Resolution (1)|0.35 / 0.19 / 0.11 /<br>0.06 / 0.03 / 0.02|||mbar|
|Accuracy 25°C,<br>750 to 1100 mbar|-2||+2|mbar|
|Accuracy -20°C to + 85°C,<br>300 to 1200 mbar (2)|-4||+4|mbar|
|Response time|0.5 / 1.1 / 2.1 / 4.1 /<br>8.22/16.44|||ms|
|Long term stability||±1||mbar/yr|
|**Temperature**|**Min**|**Typ**|**Max**|**Unit**|
|Range|-40||+85|°C|
|Resolution||<0.01||°C|
|Accuracy|-1||+1|°C|
|Notes: (1) Oversampling Ratio: 256 / 512 / 1024 / 2048 / 4096/ 8192<br> (2)Withautozero at one pressure point|||||



## **FUNCTIONAL BLOCK DIAGRAM** 

**==> picture [210 x 124] intentionally omitted <==**

**----- Start of picture text -----**<br>
VDD<br>SENSOR +IN InterfaceI [2] C Bus SDA<br>-IN ADC Filterdig. SCL<br>Sensor  Memory<br>Interface IC (PROM)<br>112 bits<br>SGND<br>GND<br>**----- End of picture text -----**<br>


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## PERFORMANCE SPECIFICATIONS 

## **ABSOLUTE MAXIMUM RATINGS** 

|**Parameter**|**Symbol**|**Conditions**|**Min.**|**Typ. **|**Max**|**Unit**|
|---|---|---|---|---|---|---|
|Supplyvoltage|VDD||-0.3||+3.6|V|
|Storage temperature|TS||-20||+85|°C|
|Overpressure|Pmax||||5|bar|
|Maximum Soldering<br>Temperature|Tmax|40 sec max|||250|°C|
|ESD rating||Human Body<br>Model|-2||+2|kV|
|Latch up||JEDEC standard<br>No 78|-100||+100|mA|



## **ELECTRICAL CHARACTERISTICS** 

|**Parameter **|**Symbol **|**Conditions**|**Min.**|**Typ. **|**Max **|**Unit**|
|---|---|---|---|---|---|---|
|OperatingSupplyvoltage|VDD||1.8|3.0|3.6|V|
|OperatingTemperature|T||-40|+25|+85|°C|
|Supply current<br>(1 sample per sec.)|IDD|OSR              8192<br>4096<br>2048<br>1024<br>512<br>256||20.09<br>10.05<br>5.02<br>2.51<br>1.26<br>0.63||µA|
|Peak supplycurrent||duringconversion||1.25||mA|
|Standbysupplycurrent||at 25°C(VDD= 3.0 V)||0.01|0.1|µA|
|VDD Capacitor||From VDD to GND|100|470||nF|



## **ANALOG DIGITAL CONVERTER (ADC)** 

|**Parameter**|**Symbol**|**Conditions**|**Min.**|**Typ. **|**Max**|**Unit**|
|---|---|---|---|---|---|---|
|Output Word||||24||bit|
|Conversion time|tc|OSR               8192<br>4096<br>2048<br>1024<br>512<br>256||16.44<br>8.22<br>4.13<br>2.08<br>1.06<br>0.54||ms|



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## PERFORMANCE SPECIFICATIONS (CONTINUED) 

## **PRESSURE OUTPUT CHARACTERISTICS (VDD = 3 V, T = 25°C UNLESS OTHERWISE NOTED)** 

|**Parameter**|**Conditions**|**Conditions**|**Min.**|**Typ. **|**Max**|**Unit**|
|---|---|---|---|---|---|---|
|OperatingPressure Range|Prange|Full Accuracy|300||1200|mbar|
|Extended Pressure Range|Pext|Linear Range of<br>ADC|10||2000|mbar|
|Absolute Accuracy,<br>no autozero|at  25°C, 750..1100 mbar||-2||+2|mbar|
|Absolute Accuracy, autozero at<br>onepressurepoint|300..1200 mbar at 25°C<br>300..1200 mbar,-20..85°C||-2<br>-4||+2<br>+4|mbar|
|Maximum error with supply<br>voltage|VDD= 1.8 V … 3.6 V|||±2.5||mbar|
|Long-term stability||||±1||mbar/yr|
|Resolution RMS|OSR                                 8192<br>4096<br>2048<br>1024<br>512<br>256|||0.02<br>0.03<br>0.06<br>0.11<br>0.19<br>0.35||mbar|
|Reflow soldering impact|IPC/JEDEC J-STD-020C<br>(See application note AN808<br>on http://meas-spec.com)|||-1.5||mbar|
|Recoveringtime after reflow(1)||||5||days|



(1) Time to recover at least 66% of the reflow impact. 

## **TEMPERATURE OUTPUT CHARACTERISTICS (VDD = 3 V, T = 25°C UNLESS OTHERWISE NOTED)** 

|**Parameter **|**Conditions**|**Min.**|**Typ. **|**Max **|**Unit**|
|---|---|---|---|---|---|
|Absolute Accuracy|at 25°C<br>-20..85°C|-1<br>-2||+1<br>+2|°C|
|Maximum error with supply<br>voltage|VDD= 1.8 V … 3.6 V||±0.3||°C|
|Resolution RMS<br>(to confirm with measured<br>values)|OSR                                 8192<br>4096<br>2048<br>1024<br>512<br>256||0.002<br>0.003<br>0.004<br>0.006<br>0.009<br>0.012||°C|



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## PERFORMANCE SPECIFICATIONS (CONTINUED) 

## **DIGITAL INPUTS (SDA, SCL)** 

|**DIGITAL INPUTS (SDA, SCL)**|||||||
|---|---|---|---|---|---|---|
|**Parameter**|**Symbol**|**Conditions**|**Min.**|**Typ. **|**Max**|**Unit**|
|Serial data clock|SCL||||400|kHz|
|Input high voltage|VIH||80% VDD||100% VDD|V|
|Input low voltage|VIL||0% VDD||20% VDD|V|
|Input leakage current|Ileak25°C<br>Ileak85°C|at 25°c|||0.1|µA|
|**DIGITAL OUTPUTS (I2C, DOUT)**|||||||
|**Parameter **|**Symbol **|**Conditions**|**Min.**|**Typ. **|**Max **|**Unit**|
|Output high voltage|VOH|Isource= 0.6 mA|80% VDD||100% VDD|V|
|Output low voltage|VOL|Isink= 0.6 mA|0% VDD||20% VDD|V|
|Load capacitance|CLOAD|||16||pF|



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## TYPICAL PERFORMANCE CHARACTERISTICS 

## **PRESSURE AND TEMPERATURE ERROR VS PRESSURE AND TEMPERATURE (TYPICAL VALUES)** 

## **PRESSURE AND TEMPERATURE ERROR VS POWER SUPPLY** 

## **(TYPICAL VALUES)** 

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## FUNCTIONAL DESCRIPTION 

**==> picture [307 x 188] intentionally omitted <==**

**----- Start of picture text -----**<br>
VDD<br>+IN I [2] C Bus<br>SENSOR<br>Interface SDA<br>ADC dig.<br>-IN Filter<br>SCL<br>Sensor  Memory<br>Interface IC (PROM)<br>112 bits<br>SGND<br>GND<br>**----- End of picture text -----**<br>


Figure 1: Block diagram of MS5805-02BA 

## **GENERAL** 

The MS5805-02BA consists of a piezo-resistive sensor and a sensor interface integrated circuit. The main function of the MS5805-02BA is to convert the uncompensated analogue output voltage from the piezo-resistive pressure sensor to a 24-bit digital value, as well as providing a 24-bit digital value for the temperature of the sensor. 

## **FACTORY CALIBRATION** 

Every module is individually factory calibrated at two temperatures and two pressures. As a result, 6 coefficients necessary to compensate for process variations and temperature variations are calculated and stored in the 112bit PROM of each module. These bits (partitioned into 6 coefficients) must be read by the microcontroller software and used in the program converting D1 and D2 into compensated pressure and temperature values. 

## **COMMUNICATION INTERFACE** 

The MS5805-02BA has been built with I[2] C serial interface. 

|**Module ref **|**Mode**|**Pins used**|
|---|---|---|
|MS5805-02BA01|I2C|SDA,SCL|



The external microcontroller clocks in the data through the input SCL (Serial CLock) and SDA (Serial DAta). The sensor responds on the same pin SDA which is bidirectional for the I[2] C bus interface. So this interface type uses only 2 signal lines and does not require a chip select. 

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MS5805-02BA01 Miniature Altimeter Module 

PRESSURE AND TEMPERATURE CALCULATION 

|**Convert calibration data into coefficients (see bit pattern of W1 to W4)**<br>**Start**<br>Maximum values for calculation results:<br>P<br>MIN<br>= 10mbar   P<br>MAX<br>= 2000mbar<br>T<br>MIN<br>= -40°C T<br>MAX<br>= 85°C T<br>REF<br>= 20°C<br>**Read calibration d ta (fa tory alibrated) from PROM**<br>~~————~~|**Convert calibration data into coefficients (see bit pattern of W1 to W4)**<br>**Start**<br>Maximum values for calculation results:<br>P<br>MIN<br>= 10mbar   P<br>MAX<br>= 2000mbar<br>T<br>MIN<br>= -40°C T<br>MAX<br>= 85°C T<br>REF<br>= 20°C<br>**Read calibration d ta (fa tory alibrated) from PROM**<br>~~————~~|**Convert calibration data into coefficients (see bit pattern of W1 to W4)**<br>**Start**<br>Maximum values for calculation results:<br>P<br>MIN<br>= 10mbar   P<br>MAX<br>= 2000mbar<br>T<br>MIN<br>= -40°C T<br>MAX<br>= 85°C T<br>REF<br>= 20°C<br>**Read calibration d ta (fa tory alibrated) from PROM**<br>~~————~~|**Convert calibration data into coefficients (see bit pattern of W1 to W4)**<br>**Start**<br>Maximum values for calculation results:<br>P<br>MIN<br>= 10mbar   P<br>MAX<br>= 2000mbar<br>T<br>MIN<br>= -40°C T<br>MAX<br>= 85°C T<br>REF<br>= 20°C<br>**Read calibration d ta (fa tory alibrated) from PROM**<br>~~————~~|**Convert calibration data into coefficients (see bit pattern of W1 to W4)**<br>**Start**<br>Maximum values for calculation results:<br>P<br>MIN<br>= 10mbar   P<br>MAX<br>= 2000mbar<br>T<br>MIN<br>= -40°C T<br>MAX<br>= 85°C T<br>REF<br>= 20°C<br>**Read calibration d ta (fa tory alibrated) from PROM**<br>~~————~~|**Convert calibration data into coefficients (see bit pattern of W1 to W4)**<br>**Start**<br>Maximum values for calculation results:<br>P<br>MIN<br>= 10mbar   P<br>MAX<br>= 2000mbar<br>T<br>MIN<br>= -40°C T<br>MAX<br>= 85°C T<br>REF<br>= 20°C<br>**Read calibration d ta (fa tory alibrated) from PROM**<br>~~————~~|**Convert calibration data into coefficients (see bit pattern of W1 to W4)**<br>**Start**<br>Maximum values for calculation results:<br>P<br>MIN<br>= 10mbar   P<br>MAX<br>= 2000mbar<br>T<br>MIN<br>= -40°C T<br>MAX<br>= 85°C T<br>REF<br>= 20°C<br>**Read calibration d ta (fa tory alibrated) from PROM**<br>~~————~~|
|---|---|---|---|---|---|---|
||**Variable**|**Size**<br>**[1]**<br>**[bit]**<br>**min**<br>**Recommended**<br>**variable type**<br>**Description | Equation**<br>**Value**<br>**max**|||**Example /**<br>**Typical**||
||_C1_|Pressure sensitivity | SENS<br>T1<br>unsigned int 16<br>16<br>0|65535||46372||
||_C2_|Pressure offset | OFF<br>T1<br>unsigned int 16<br>16<br>0|65535||43981||
||_C3_|Temperature coefficient of pressure sensitivity | TCS<br>unsigned int 16<br>16<br>0|65535||29059||
||_C4_|Temperature coefficient of pressure offset | TCO<br>unsigned int 16<br>16<br>0|65535||27842||
||_C5_|Reference temperature | T<br>REF<br>unsigned int 16<br>16<br>0|65535||31553||
||_C6_|Temperature coefficient of the temperature | TEMPSENS<br>unsigned int 16<br>16<br>0|65535||28165||
|||**Read digital pressure and temperature data**<br>**Read digital pressure and temperature data**|||||
||_D1_|Digital pressure value<br>unsigned int 32<br>24<br>0|16777216||6465444||
||_D2_|Digital temperature value<br>unsigned int 32<br>24<br>0|16777216||8077636||
|||**Calculate temperature**|||||
||_dT_|Difference between actual and reference temperature<br>[2]<br>_dT_<br>= D2 - T<br>REF<br>=<br>_D2_<br>-<br>_C5 * 2_<br>_8_<br>signed int 32<br>25<br>-16776960|16777216||68||
||_TEMP_|signed int 32<br>Actual temperature (-40…85°C with 0.01°C resolution)<br>_TEMP_<br>=<br>20°C<br>+<br>dT<br>*<br>TEMPSENS<br>=<br>2000<br>+<br>_dT_<br>*<br>_C6_<br>/<br>2<br>23<br>-4000<br>41|8500||2000<br>= 20.00 °C||
|_OFF_<br>Offset at actual temperature<br>[3]<br>_OFF_<br>=<br> <br>OFF<br>T1<br>+<br>TCO<br>*<br>dT =<br>_C2_<br>*<br>2<br>17<br>+<br> <br>(C4<br>*<br>_dT_<br>)<br>/<br>2<br>6<br>signed int 64<br>41<br>-17179344900<br>25769410560<br>5764707214<br>_SENS_<br>Sensitivity at actual temperature<br>[4]<br>_SENS_<br>=<br>SENS<br>T1<br>+<br> <br>TCS<br>*<br> <br>dT<br>=<br>_C1 * 2_<br>_16_<br>+<br> <br>(<br>_C3_<br>*<br> <br>_dT_<br>)<br>/<br>2<br>7<br>signed int 64<br>41<br>-8589672450<br>12884705280<br>3039050829<br>110002<br>= 1100.02 mbar<br>120000<br>1000<br>58<br>_P_<br>signed int 32<br>Temperature compensated pressure (10…1200mbar with<br>0.01mbar resolution)<br>_P_<br>= D1 * SENS - OFF =<br>_(D1 * SENS / 2_<br>_21_<br>_- OFF) / 2_<br>_15_<br>**Calculate temperature compensated pressure**<br>**Calculate temperature compensated pressure**<br>**Pressure and temperature value first order**<br>~~——~~|||||||
||Notes||||||
||[1]|Maximal size of intermediate result during evaluation of variable|||||
||[2]|min and max have to be defined|||||
||[3]|min and max have to be defined|||||
||[4]|min and max have to be defined|||||



Figure 2: Flow chart for pressure and temperature reading and software compensation. 

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MS5805-02BA01 Miniature Altimeter Module 

## **SECOND ORDER TEMPERATURE COMPENSATION** 

The results of the last first order calculation are entered in the following chart to obtain the pressure and temperature compensated with the 2[nd] order: P2 and TEMP2. 

**==> picture [280 x 234] intentionally omitted <==**

**----- Start of picture text -----**<br>
Pressure and temperature value first order<br>Yes No<br>TEMP<20°C<br>Low temperature Low temperature<br>Ti = 11  dT 2 / 235<br>OFFi = 31  (TEMP – 2000) [2]  / 2 [3]<br>SENSi = 63  (TEMP – 2000) [2] / 2 [5]<br>Calculate pressure and temperature 2 [nd]  order<br>OFF2 = OFF - OFFi<br>SENS2 = SENS - SENSi<br>TEMP2 = (TEMP – Ti) / 100  [°C]<br>P2 = (( D1 * SENS2 / 2 [21]  – OFF2 ) / 2 [15]  ) / 100  [mbar]<br>**----- End of picture text -----**<br>


Figure 3: Flow chart for pressure and temperature to the optimum accuracy. 

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MS5805-02BA01 Miniature Altimeter Module 

## I[2] C INTERFACE 

## **COMMANDS** 

The MS5805-02BA has only five basic commands: 

1. Reset 

2. Read PROM (112 bit of calibration words) 

3. D1 conversion 

4. D2 conversion 

5. Read ADC result (24 bit pressure / temperature) 

Each I[2] C communication message starts with the start condition and it is ended with the stop condition. The MS5805-02BA address is 1110110x (write : x=0, read : x=1). 

Size of each command is 1 byte (8 bits) as described in the table below. After ADC read commands the device will return 24 bit result and after the PROM read 16bit result. The address of the PROM is embedded inside of the PROM read command using the a2, a1 and a0 bits. 

||**Command byte**|**Command byte**|**Command byte**||||||**hex value**|
|---|---|---|---|---|---|---|---|---|---|
|Bit number|0|1|2|3|4|5|6|7||
|Bit name|PRO<br>M|CO<br>NV|-|Typ|Ad2/<br>Os2|Ad1/<br>Os1|Ad0/<br>Os0|Stop||
|Command||||||||||
|Reset|0|0|0|1|1|1|1|0|0x1E|
|Convert D1(OSR=256)|0|1|0|0|0|0|0|0|0x40|
|Convert D1(OSR=512)|0|1|0|0|0|0|1|0|0x42|
|Convert D1(OSR=1024)|0|1|0|0|0|1|0|0|0x44|
|Convert D1(OSR=2048)|0|1|0|0|0|1|1|0|0x46|
|Convert D1(OSR=4096)|0|1|0|0|1|0|0|0|0x48|
|Convert D1(OSR=8192)|0|1|0|0|1|0|1|0|0x4A|
|Convert D2(OSR=256)|0|1|0|1|0|0|0|0|0x50|
|Convert D2(OSR=512)|0|1|0|1|0|0|1|0|0x52|
|Convert D2(OSR=1024)|0|1|0|1|0|1|0|0|0x54|
|Convert D2(OSR=2048)|0|1|0|1|0|1|1|0|0x56|
|Convert D2(OSR=4096)|0|1|0|1|1|0|0|0|0x58|
|Convert D2(OSR=8192)|0|1|0|1|1|0|1|0|0x5A|
|ADC Read|0|0|0|0|0|0|0|0|0x00|
|PROM Read|1|0|1|0|Ad2|Ad1|Ad0|0|0xA0 to<br>0xAE|



Figure 4: Command structure 

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MS5805-02BA01 Miniature Altimeter Module 

## **RESET SEQUENCE** 

The Reset sequence shall be sent once after power-on to make sure that the calibration PROM gets loaded into the internal register. It can be also used to reset the device PROM from an unknown condition. 

The reset can be sent at any time. In the event that there is not a successful power on reset this may be caused by the SDA being blocked by the module in the acknowledge state. The only way to get the MS5805 to function is to send several SCLs followed by a reset sequence or to repeat power on reset. 

||1|1|1|0|1|1|0|0|0|0|0|0|1|1|1|1<br>0|0|||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|||Device||Address||||||||command||||||||
|S||Device||Address||||W|A|||cmd||byte|||A|P||
|||||||||||||||||||||
||From||Master||||S = Start|||Condition||||||W = Write|||A = Acknowledge|
||From||Slave||||P = Stop Condition|||||||||R = Read|||N = Not Acknowledge|



Figure 5: I[2] C Reset Command 

## **PROM READ SEQUENCE** 

The read command for PROM shall be executed once after reset by the user to read the content of the calibration PROM and to calculate the calibration coefficients. There are in total 7 addresses resulting in a total memory of 112 bit. Addresses contains factory data and the setup, calibration coefficients, the serial code and CRC. The command sequence is 8 bits long with a 16 bit result which is clocked with the MSB first. The PROM Read command consists of two parts. First command sets up the system into PROM read mode. The second part gets the data from the system. 

**==> picture [287 x 51] intentionally omitted <==**

**----- Start of picture text -----**<br>
1 1 1 0 1 1 0 0 0 1 0 1 0 0 1 1 0 0<br>Device Address command<br>S Device Address W A cmd byte A P<br>From Master S = Start Condition W = Write A = Acknowledge<br>From Slave P = Stop Condition R = Read N = Not Acknowledge<br>**----- End of picture text -----**<br>


Figure 6: I[2] C Command to read memory address= 011 

|1<br>1<br>1<br>0<br>1<br>1<br>0<br>1<br>0<br>X<br>X<br>X<br>X<br>X<br>X<br>X<br>X<br>0<br>X<br>X<br>X<br>X<br>X<br>X<br>X<br>X<br>0<br>DeviceAddress<br>data<br>data|1<br>1<br>1<br>0<br>1<br>1<br>0<br>1<br>0<br>X<br>X<br>X<br>X<br>X<br>X<br>X<br>X<br>0<br>X<br>X<br>X<br>X<br>X<br>X<br>X<br>X<br>0<br>DeviceAddress<br>data<br>data|1<br>1<br>1<br>0<br>1<br>1<br>0<br>1<br>0<br>X<br>X<br>X<br>X<br>X<br>X<br>X<br>X<br>0<br>X<br>X<br>X<br>X<br>X<br>X<br>X<br>X<br>0<br>DeviceAddress<br>data<br>data|1<br>1<br>1<br>0<br>1<br>1<br>0<br>1<br>0<br>X<br>X<br>X<br>X<br>X<br>X<br>X<br>X<br>0<br>X<br>X<br>X<br>X<br>X<br>X<br>X<br>X<br>0<br>DeviceAddress<br>data<br>data|1<br>1<br>1<br>0<br>1<br>1<br>0<br>1<br>0<br>X<br>X<br>X<br>X<br>X<br>X<br>X<br>X<br>0<br>X<br>X<br>X<br>X<br>X<br>X<br>X<br>X<br>0<br>DeviceAddress<br>data<br>data|1<br>1<br>1<br>0<br>1<br>1<br>0<br>1<br>0<br>X<br>X<br>X<br>X<br>X<br>X<br>X<br>X<br>0<br>X<br>X<br>X<br>X<br>X<br>X<br>X<br>X<br>0<br>DeviceAddress<br>data<br>data|1<br>1<br>1<br>0<br>1<br>1<br>0<br>1<br>0<br>X<br>X<br>X<br>X<br>X<br>X<br>X<br>X<br>0<br>X<br>X<br>X<br>X<br>X<br>X<br>X<br>X<br>0<br>DeviceAddress<br>data<br>data|1<br>1<br>1<br>0<br>1<br>1<br>0<br>1<br>0<br>X<br>X<br>X<br>X<br>X<br>X<br>X<br>X<br>0<br>X<br>X<br>X<br>X<br>X<br>X<br>X<br>X<br>0<br>DeviceAddress<br>data<br>data|1<br>1<br>1<br>0<br>1<br>1<br>0<br>1<br>0<br>X<br>X<br>X<br>X<br>X<br>X<br>X<br>X<br>0<br>X<br>X<br>X<br>X<br>X<br>X<br>X<br>X<br>0<br>DeviceAddress<br>data<br>data|
|---|---|---|---|---|---|---|---|---|
|S|DeviceAddress|R|A|Memory bit15-8|A|Memory bit7 -0|N|P|
|From Master<br>S = Start Condition<br>W = Write<br>A = Acknowledge<br>From Slave<br>P = Stop Condition<br>R = Read<br>N = Not Acknowledage|||||||||
||||||||||
||||||||||



Figure 7: I[2] C answer from MS5805 

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MS5805-02BA01 Miniature Altimeter Module 

## **CONVERSION SEQUENCE** 

The conversion command is used to initiate uncompensated pressure (D1) or uncompensated temperature (D2) conversion. After the conversion, using ADC read command the result is clocked out with the MSB first. If the conversion is not executed before the ADC read command, or the ADC read command is repeated, it will give 0 as the output result. If the ADC read command is sent during conversion the result will be 0, the conversion will not stop and the final result will be wrong. Conversion sequence sent during the already started conversion process will yield incorrect result as well. A conversion can be started by sending the command to MS5805. When command is sent to the system it stays busy until conversion is done. When conversion is finished the data can be accessed by sending a Read command, when an acknowledge is sent from the MS5805, 24 SCL cycles may be sent to receive all result bits. Every 8 bits the system waits for an acknowledge signal. 

|||1<br>1<br>1<br>0<br>1<br>1|0|0<br>0<br>0<br>1<br>0<br>0<br>1<br>0|0<br>0<br>0|||
|---|---|---|---|---|---|---|---|
|S<br>Device Address<br>Device Address<br>~~a~~||||W A<br>A<br>P<br>cmd byte<br>command<br>~~OO~~||||
|~~O~~|~~O~~|From Master<br>From Slave<br>~~O~~|S = Start Condition<br>P = Stop Condition||W = Write<br>R = Read||A = Acknowledge<br>N = Not Acknowledge|



Figure 8: I[2] C command to initiate a pressure conversion (OSR=4096, typ=D1) 

|||1<br>1<br>1<br>0<br>1<br>1<br>0<br>0<br>0<br>0<br>0<br>0<br>0<br>0<br>0<br>0<br>0<br>0|||||||
|---|---|---|---|---|---|---|---|---|
|||S<br>W A<br>A<br>P<br>Device Address<br>Device Address<br>cmd byte<br>command<br>~~CT~~|||||||
|||From Master<br>S = Start Condition<br>W = Write<br>A = Acknowledge<br>From Slave<br>P = Stop Condition<br>R = Read<br>N = Not Acknowledge<br>~~co~~|||||||
|||Figure 9: I2C ADC read sequence|||||||
|||1<br>1<br>1<br>0<br>1<br>1<br>0<br>1<br>0<br>X<br>X<br>X<br>X<br>X<br>X<br>X<br>X<br>0<br>X<br>X<br>X<br>X<br>X<br>X<br>X<br>X<br>0<br>X|X<br>X<br>X<br>X|X|X|X|0||
|S<br>R<br>A<br>A<br>A<br>N<br>P<br>Data 7 - 0<br>Data 15 - 8<br>Device Address<br>Device Address<br>data<br>data<br>Data 23-16<br>data<br>~~LY~~|||||||||
|~~=~~|~~=~~|From Master<br>S = Start Condition<br>W = Write<br>A = Acknowledge<br>From Slave<br>P = Stop Condition<br>R = Read<br>N = Not Acknowledge<br>~~=~~|||||||



Figure 10: I[2] C answer from MS5805 

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MS5805-02BA01 Miniature Altimeter Module 

## CYCLIC REDUNDANCY CHECK (CRC) 

MS5805-02BA contains a PROM memory with 112-Bit. A 4-bit CRC has been implemented to check the data validity in memory. The C code example below describes the CRC calculation which is stored on DB12 to DB15 in the first PROM word. 

**==> picture [230 x 122] intentionally omitted <==**

**----- Start of picture text -----**<br>
A  D D D D D D D D D D D D D D D D<br>B B B B B B<br>d  B B B B B B B B B B<br>1 1 1 1 1 1<br>d  5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0<br>0  CRC Factory defined<br>1  C1<br>2  C2<br>3  C3<br>4  C4<br>5  C5<br>6  C6<br>**----- End of picture text -----**<br>


Figure 11: Memory PROM mapping 

C Code example for CRC-4 calculation: 

unsigned char crc4(unsigned int n_prom[]) // n_prom defined as 8x unsigned int (n_prom[8]) { int cnt; // simple counter unsigned int n_rem=0; // crc reminder unsigned char n_bit; n_prom[0]=((n_prom[0]) & 0x0FFF); // CRC byte is replaced by 0 n_prom[7]=0; // Subsidiary value, set to 0 for (cnt = 0; cnt < 16; cnt++) // operation is performed on bytes { // choose LSB or MSB if (cnt%2==1) n_rem ^= (unsigned short) ((n_prom[cnt>>1]) & 0x00FF); else n_rem ^= (unsigned short) (n_prom[cnt>>1]>>8); for (n_bit = 8; n_bit > 0; n_bit--) { if (n_rem & (0x8000)) n_rem = (n_rem << 1) ^ 0x3000; else n_rem = (n_rem << 1); } } n_rem= ((n_rem >> 12) & 0x000F); // final 4-bit reminder is CRC code return (n_rem ^ 0x00); 

} 

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MS5805-02BA01 Miniature Altimeter Module 

## APPLICATION CIRCUIT 

The MS5805-02BA is a circuit that can be used in conjunction with a microcontroller in mobile altimeter applications. It is designed for low-voltage systems with a supply voltage of 3 V. 

Figure 12: Typical application circuit with I[2] C protocol communication 

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MS5805-02BA01 Miniature Altimeter Module 

## PIN CONFIGURATION 

Figure 13: pin configuration 

|**Pin**|**Name**|**Type**|**Function **|
|---|---|---|---|
|1|VDD|P|Positive supplyvoltage|
|2|SCL|I|Serial data Clock|
|3|SDA|IO|I2C data IO|
|4|GND|P|Ground|



## DEVICE PACKAGE OUTLINE 

Figure 14: MS5805-02BA package outlines 

- Notes: (1) Dimensions in mm 

   - (2) Interpret Dim and tolerance per ASME Y14.5M - 1994 

   - (3) Angular dimensions ± 0.3° 

   - (4) Hole locations ± 0.1 

   - (4) Linear dimension ± 0.1 

   - (5) Cap centering ± 0.15 from center of the ceramic 

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MS5805-02BA01 Miniature Altimeter Module 

## RECOMMENDED PAD LAYOUT 

Pad layout for bottom side of the MS5805 soldered onto printed circuit board. 

Figure 15: MS5805 pad layout 

## SHIPPING PACKAGE 

Figure 16: Tape and Reel 

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MS5805-02BA01 Miniature Altimeter Module 

## MOUNTING AND ASSEMBLY CONSIDERATIONS 

## **SOLDERING** 

Please refer to the application note AN808 available on our website for all soldering issues. 

## **CONNECTION TO PCB** 

The package outline of the module allows the use of a flexible PCB for interconnection. This can be important for applications in watches and other special devices. 

## **CLEANING** 

The MS5805-02BA has been manufactured under cleanroom conditions. It is therefore recommended to assemble the sensor under class 10’000 or better conditions. Should this not be possible, it is recommended to protect the sensor opening during assembly from entering particles and dust. To avoid cleaning of the PCB, solder paste of type “no-clean” shall be used. Cleaning might damage the sensor! 

## **ESD PRECAUTIONS** 

The electrical contact pads are protected against ESD up to 2 kV HBM (human body model). It is therefore essential to ground machines and personnel properly during assembly and handling of the device. The MS5805-02BA is shipped in antistatic transport boxes. Any test adapters or production transport boxes used during the assembly of the sensor shall be of an equivalent antistatic material. 

## **DECOUPLING CAPACITOR** 

Particular care must be taken when connecting the device to the power supply. A 100 nF ceramic capacitor must be placed as close as possible to the MS5805-02BA VDD pin. This capacitor will stabilize the power supply during data conversion and thus, provide the highest possible accuracy. 

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MS5805-02BA01 Miniature Altimeter Module 

## ORDERING INFORMATION 

|**Part Number / Art. Number **|**Product**|**Delivery Form**|
|---|---|---|
|MS580502BA01-50|MS5805-02BA Miniature Altimeter Module T&R|Tape& reel TOP-UP|



## **NORTH AMERICA** 

Measurement Specialties, Inc., a TE Connectivity company Tel:  800-522-6752 

Email: customercare.frmt@te.com 

## **EUROPE** 

Measurement Specialties (Europe), Ltd., a TE Connectivity Company Tel:  800-440-5100 Email: customercare.bevx@te.com 

## **ASIA** 

Measurement Specialties (China) Ltd., a TE Connectivity company Tel:  0400-820-6015 Email: customercare.shzn@te.com 

## **TE.com/sensorsolutions** 

Measurement Specialties, Inc., a TE Connectivity company. 

Measurement Specialties, TE Connectivity, TE Connectivity (logo) and EVERY CONNECTION COUNTS are trademarks. All other logos, products and/or company names referred to herein might be trademarks of their respective owners. 

The information given herein, including drawings, illustrations and schematics which are intended for illustration purposes only, is believed to be reliable. However, TE Connectivity makes no warranties as to its accuracy or completeness and disclaims any liability in connection with its use. TE Connectivity‘s obligations shall only be as set forth in TE Connectivity‘s Standard Terms and Conditions of Sale for this product and in no case will TE Connectivity be liable for any incidental, indirect or consequential damages arising out of the sale, resale, use or misuse of the product. Users of TE Connectivity products should make their own evaluation to determine the suitability of each such product for the specific application. © 2015 TE Connectivity Ltd. family of companies All Rights Reserved. 

06/2015 

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Page 18 



## Links

- [View this product on Novapart](https://novapart.co/products/MS580502BA01-50/pressure-sensor-2-bar-digital-36-v-o-ring-seal)
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- [Supplier page](https://es.farnell.com/en-ES/te-connectivity/ms580502ba01-50/pressure-sensor-1200mbar-digital/dp/3397831)
---

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