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LM931-0552
Bluetooth 4.1, Low Energy Module, 3.3V to 3.6V Supply, 55m Range, 1Mbps, -92dBm Sensitivity
⚠️ Reference pricing provided. In case of supply shortages, we will connect you with our trusted procurement partners to ensure your project's continuity.
- Manufacturer: LM TECHNOLOGIES
- Product type: Bluetooth Modules & Adaptors
- Bluetooth Version:Bluetooth 4.1; Supply Voltage Min:3.3V; Supply Voltage Max:3.6V; Signal Range Max:55m; Data Rate:1Mbps; Bluetooth Class:-; Receive Sensitivity:-92dBm; Operating Tempe
- SVHC: No SVHC (17-Dec-2015)
- Interfaces: I2C, UART
- Product Range: -
- Certifications: -
- Bluetooth Class: -
- Bluetooth Version: Bluetooth 4.1
- Supply Voltage Range: 3.3 V to 3.6 V
- Receiver Sensitivity Rx: -92 dBm
- Operating Temperature Range: -30 °C to 85 °C
| Delivery and price | |
|---|---|
| Units per pack | 250 |
| Price | 12.28 € |
| Current stock | 10+ |
| Lead time | 30 days |
Datasheet
## **LM931 Bluetooth® low energy Module**
Standalone (With Embedded Bluetooth® v4.1 Stack)
Product LM931 Part No See Last Page Revised 29/AUG/2017
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**----- Start of picture text -----**<br>
2.50mm<br>Zp yy<br>22mm<br>10.11mm<br>**----- End of picture text -----**<br>
## **Features**
- I2C and UART
- e 14 mA Current Consumption (at 0 dBm Tx Output Power) e
- 9 digital and 3 analogue I/O (10-bit ADC)
- IC Antenna Onboard (Peak Gain = 0.5 dBi)
- Wake-up interrupt and Watchdog timer
- e 9 dBm Tx Output Power (Max) and -92 dBm Rx Sensitivity e
- 4 PWM channels
- Over-the-Air Upgrade (OTAU) available
- 22mm x 10.11mm x 2.50mm
- Application Firmware Support
- ee
- SMT Side and Bottom Pads for easy production
- IoT Applications available including Serial over GATT, Eddystone™ Beacon and Cloud Sensor & Cloud Collector
- Fully integrated module with no additional components required
- RoHS, REACH and WEEE Compliant Solution
## **Overview**
The LM931 Bluetooth® low energy module is designed for use within embedded systems. It is implemented as a peripheral device within a product, while saving the developer valuable PCB space. The LM931 enables wireless communication with other nearby Bluetooth® low energy devices (e.g. iOS and Android) using a highly power efficient connection. The transmission output power ranges from 0 dBm to 9 dBm and can be configured to provide an extended battery life or a longer communication range.
This single core standalone module combines a Bluetooth® low energy radio using a Bluetooth® v4.1 stack, plus a microcontroller with 512 kB EEPROM for running the application. The LM931 incorporates 27 pin outs including UART and I2C for interfacing with a wide range of peripheral devices like sensors. It’s SMT side and bottom pads allow for easy manufacture and placement into your product. Application firmware and configuration settings can be preloaded to the module before supply.
for the module. IoT Applications such as Serial over GATT, iBeacon™ and Key Fob (with RGB LED Controller) are available with the module’s LM53X development kits. The firmware is customisable to meet your requirements.
**LM931**
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Page 1 of 14
## **LM931 Bluetooth® low energy Module**
Standalone (With Embedded Bluetooth® v4.1 Stack)
Product LM931 Part No See Last Page
##
|Wireless||
|---|---|
|Bluetooth® Standard|v4.1|
|Module Type|Standalone (Embedded Bluetooth® Stack)|
|Profiles|GATT-Based|
|Hardware||
|---|---|
|Chipset|Qualcomm®|
|Antenna|IC Antenna Onboard|
|Microcontroller (MCU)|16-bit RISC|
|EEPROM Memory|512 kB|
|RAM|64 kB|
|Programming Interface|SPI|
|Interfaces|I2C, UART, AIO and PIO|
|Power Supply|3V3 (3V6 Max)|
|Crystal Oscillators|32 kHz and 16 MHz|
|Development Kit|LM53X|
|RF Characteristics||
|---|---|
|Tx Output Power|0 dBm to 9 dBm|
|Rx Sensitivity|-92 dBm (Typical)|
|Current Consumption (Continuous Tx)|14 mA (at 0 dBm), 15.9 mA (at 3 dBm) and <25 mA (at 9 dBm)|
|Current Consumption (Continuous Rx)|22 mA (Typical)|
|Range (in open space)|Up to 55m|
|Data Rate|Up to 1 Mbps|
|Frequency|2.4 GHz to 2.485 GHz|
|Physical Characteristics||
|Operating Temperature|-30°C to +85°C|
|Dimensions (L x W x H)|22mm x 10.11mm x 2.50mm|
|Weight|0.83g|
|Certifications|See our website for this products certifications|
|Compliance|RoHS, REACH and WEEE Compliant Solution|
**LM931** Page 2 of 14
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## **LM931 Bluetooth® low energy Module**
Standalone (With Embedded Bluetooth® v4.1 Stack)
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**----- Start of picture text -----**<br>
Product LM931<br>Part No See Last Page<br>**----- End of picture text -----**<br>
## **IoT Applications**
The LM931 standalone module is capable of running your Bluetooth® low energy application. Requiring no external hardware and supports a wide range of applications such as:
- Alert Tag
- Automotive Key Fob
- Beacon
- Blood Pressure Sensor
- Cycling Speed and Cadence Sensor
- Environment Sensor
- Health Thermometer
- Heart Rate Sensor
- Keyboard & Mouse
- Multifunction Steering Wheel
- Security Tag
- Serial Communication Time Client
- Temperature and Pressure Weight Scale
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User Application<br>GAP GATT<br>a<br>SMP ATT<br>a<br>L2CAP<br>CS<br>Link Layer<br>LE PHY<br>Td<br>**----- End of picture text -----**<br>
LM provide firmware that can be customised to your specification.
Firmware available:
- Cloud Sensor
- Cloud Collector
- Eddystone™ Beacon
- URL Beacon
- iBeacon™
- Serial Server
- Console
- Key Fob (with RGB LED Controller)
**LM931** Page 3 of 14
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LM931 See Last Page
## **LM931 Bluetooth® low energy Module**
Standalone (With Embedded Bluetooth® v4.1 Stack)
Product
Part No
## **Radio Frequency Characteristics**
## **Transmit Power Measurements**
## **Crystal Trim**
|Specification<br>**Crystal Trim**||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|Specification|Measurement||Unit|||||||||||||
|Frequency Offset ±1KHz|0.75KHz||KHz|||||||||||||
|Trim Value|12||-|||||||||||||
|**Output Power**||||||||||||||||
|Specification|||Measurement||||||||||||Unit|
|Ppk<br><Pav +3 dBm<br>**Low Energy**|Ppk<br>-20 dBm<Pave<10dBm||Pav<br>8.1<br>8.4<br>Ppk<br>2402MHz (CH0*)||||8.4<br>Pav<br>2442MHz (CH20*)||8.6<br>Ppk<br>2442MHz (CH20*)||9<br>Pav<br>2480MHz (CH39*)||9.2<br>Ppk<br>2480MHz (CH39*)||dBm|
|**Receive Measurements**||||||||||||||||
|**Limitation Sensitivity**||||||||||||||||
|Specification|||Measurement||||||||||||Unit|
|**Low Energy**<br>BER≤30.8% for receiving power<br>is -70 dBm or better.|BER≤30.8% for receiving power<br>is -70 dBm or better.||-93<br>2402MHz (CH0*)||||-92<br>2442MHz (CH20*)||||-93<br>2480MHz (CH39*)||||dBm|
|**Maximum Input Level**||||||||||||||||
|Specification|||Measurement||||||||||||Unit|
|**Low Energy**<br>PER≤30.8% for receiving power<br>is -10 dBm or better.|PER≤30.8% for receiving power<br>is -10 dBm or better.||0<br>2402MHz (CH0*)||||0<br>2442MHz (CH20*)||||0<br>2480MHz (CH39*)||2480MHz (CH39*)||%|
## **Current Consumption Test**
Figure:
## **Test Condition**
(BLE PRBS9 Channel 2442MHz Package Length 37)
Continuous Tx: 14 mA (at 0 dBm), 15.9mA (at 3dBm) and <25 mA (at 9dBm) Continuous Rx: 22 mA (typ.) Power Boot Up: 3 mA (typ.)
**LM931** Page 4 of 14
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LM931 See Last Page
Product Part No
## **LM931 Bluetooth® low energy Module**
Standalone (With Embedded Bluetooth® v4.1 Stack)
## **Powering**
Use VDD_PADS (Pin 16) or VBAT (Pin 17) to power the module.
## **Pin Out**
|**GND**|**1**<br>**27**|**GND**|
|---|---|---|
|**GND**|**2**<br>**26**|**WAKE**|
|**GND**|**3**<br>**25**|**SPIPION**|
|**AIO2**|**4**<br>**24**|**IO11 / I2C**|
|**AIO1**|**5**<br>**23**|**IO10 / I2C**|
|**AIO0**|**6**<br>**22**|**IO9**|
|**GND**|**7**<br>**21**|**GND**|
|**IO0**|**8**<br>**20**|**IO8 / SPI**|
|**IO1**|**9**<br>**19**|**IO7 / SPI**|
|**IO3**|**10**<br>**18**|**IO6 / SPI**|
|**IO4**|**11**<br>**17**|**VBAT**|
|**IO5 / SPI**<br>**GND**|**12**<br>**13**<br>**16**<br>**15**<br>**14**<br>**GND**|**VDD_PADS**<br>**GND**|
**LM931** Page 5 of 14
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## **LM931 Bluetooth® low energy Module**
|**LM931 Bluetooth® low energy Module**|**LM931 Bluetooth® low energy Module**|**LM931 Bluetooth® low energy Module**|**LM931 Bluetooth® low energy Module**||Product|LM931|
|---|---|---|---|---|---|---|
|Standalone (With Embedded Bluetooth® v4.1 Stack)|Standalone (With Embedded Bluetooth® v4.1 Stack)||||Part No|See Last Page|
|**Pin Assignments**|**Pin Assignments**||||||
|Pin|Name|Type|Description|Min|Typical|Max|
|1|GND|Ground|Common Ground||0V||
|2|GND|Ground|Common Ground||0V||
|3|GND|Ground|Common Ground||0V||
|4|AIO2|Input|Analogue Input Output|||VDD|
|5|AIO1|Input|Analogue Input Output|||VDD|
|6|AIO0|Input|Analogue Input Output|||VDD|
|7|GND|Ground|Common Ground||0V||
|8|IO0|I/O|UART TX|||VDD|
|9|IO1|I/O|UART RX|||VDD|
|10|IO3|I/O|Programmable Input Output (PIO)|||VDD|
|11|IO4|I/O|Programmable Input Output (PIO)|||VDD|
|12*|IO5 / SPI|I/O|Programmable Input Output (PIO) / DEBUG_CLK|||VDD|
|13|GND|Ground|Common Ground||0V||
|14|GND|Ground|Common Ground||0V||
|15|GND|Ground|Common Ground||0V||
|16|VDD_PADS|Power|Positive supply for all digital and analogue I/O Pins|1V2|3V3|3V6|
|17|VBAT|Power|Module battery power supply DC|1V8|3V3|3V6|
|18*|IO6 / SPI|I/O|Programmable Input Output (PIO) / DEBUG_CS#|||VDD|
|19*|IO7 / SPI|I/O|Programmable Input Output (PIO) / DEBUG_MOSI|||VDD|
|20*|IO8 / SPI|I/O|Programmable Input Output (PIO) / DEBUG_MISO|||VDD|
|21|GND|Ground|Common Ground||0V||
|22|IO9|I/O|Programmable Input Output (PIO)|||VDD|
|23|IO10 / I2C|I/O|Programmable Input Output (PIO) / SDA|||VDD|
|24|IO11 / I2C|I/O|Programmable Input Output (PIO) / SCL|||VDD|
|25|SPIPION|Input|High to enable the SPI debug interface, Low to enable PIO|||VDD|
|26|WAKE|Input|Toggle to wake from Dormant Mode|||VDD_BAT|
|27|GND|Ground|Common Ground||0V||
Standalone (With Embedded Bluetooth® v4.1 Stack)
## **Pin Assignments**
- for SPI at P12, P18, P19 and P20 set P25 to High.
- for PIO at P12, P18, P19 and P20 set P25 to Low.
**LM931** Page 6 of 14
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Product LM931 Part No See Last Page
## **LM931 Bluetooth® low energy Module**
Standalone (With Embedded Bluetooth® v4.1 Stack)
## **Module Block Diagram**
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VBAT / PADS<br>ANT<br>PWM<br>AIO<br>Filter BT_RF<br>SPI_Debug<br>Qualcomm Chipset<br>UART<br>E² PROM I2C<br>512 kB<br>PIO<br>XTAL XTAL<br>32 kHz 16 MHz<br>LM931<br>**----- End of picture text -----**<br>
**LM931** Page 7 of 14
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## **LM931 Bluetooth® low energy Module**
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Product LM931<br>Standalone (With Embedded Bluetooth® v4.1 Stack) Part No See Last Page<br>Physical Dimensions<br>Top View<br>27 15<br>1.27<br>1.08<br>14 A 0.8 x 0.6mm<br>0.8<br>Pin 1 13<br>i 0.825 ww Pin Spacing<br>6.2mm<br>21.65mm<br>22mm<br>Front View<br>A<br>2.50mm<br>vo<br>6.2mm<br>21.65mm<br>22mm<br>Side View<br>2.50mm<br>-vy =<br>0.825mm<br>9.375mm<br>10.11mm<br>10.11mm 9.375mm<br>**----- End of picture text -----**<br>
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Page 8 of 14
## **LM931 Bluetooth® low energy Module**
Standalone (With Embedded Bluetooth® v4.1 Stack)
Product LM931 Part No See Last Page
## **PCB Footprint**
||**PCB Footprint**|||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
||Optimal Placement Position||**Pin 1**<br>**13**<br>**27**<br>**15**<br>**14**<br>EDGE OF HOST PCB<br>( Optimal )<br>ahaa<br>aah hhh<br>|<br>7<br>FARRAR AAR<br>RARRAAI|||||||||
|If the optimal placement position|**13**<br>**27**<br>**15**<br>**14**<br>Placement Note<br>If the optimal placement position<br>cannot be achieved, ensure<br>there is no metal beneath the<br>highlighted part of module.<br>NB<br>Aim to place the module<br>away from interference.<br>(i.e: place the module at the<br>edge of the board.)<br>**NO METAL**<br>!_|||||||||||
|||||**Pin 1**||||||||
||.||||**27**<br>**15**<br>ans<br>8 8-88 Cor)|||||||
|||||||||1.27||||
||10.11mm<br>9.375mm|||||**14**<br>oO|||0.8||1.08|
|||||**Pin 1**||**13**||||||
||0.825||||~~R~~AAAAAAAAAAAI|||Pin Spacing||||
||||6.2mm|||||||||
||||||21.65mm|||||||
||||||22mm|||||||
**LM931** Page 9 of 14
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## **LM931 Bluetooth® low energy Module** Standalone (With Embedded Bluetooth® v4.1 Stack)
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Product LM931<br>Part No See Last Page<br>**----- End of picture text -----**<br>
##
**LM931**
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Page 10 of 14
## **LM931 Bluetooth® low energy Module**
Standalone (With Embedded Bluetooth® v4.1 Stack)
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Product LM931<br>Part No See Last Page<br>**----- End of picture text -----**<br>
## **Tape and Reel Packaging**
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Tape Dimensions<br>**----- End of picture text -----**<br>
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16mm 0.15mm 4mm<br>LM930/931<br>°|<br>23mm 48mm<br>_ |<br>11mm<br>HI<br>3.25mm<br>Reel Dimensions<br>330mm<br>0.32mm<br>**----- End of picture text -----**<br>
Notes
Carton Dimensions (L x W x H): 360mm x 290mm x 370mm
Quantities
1250 modules per Tape 4 Boxes per Carton 5000 modules per Carton
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48mm<br>92mm<br>**----- End of picture text -----**<br>
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LM931<br>Page 11 of 14<br>**----- End of picture text -----**<br>
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LM931 See Last Page
Product Part No
**LM931 Bluetooth® low energy Module** Standalone (With Embedded Bluetooth® v4.1 Stack)
## **Tray Packaging**
Tray Dimensions
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8mm 9.1mm<br>LM930 LM931 4 X 15<br>4.6m<br>ee<br>{ CUTOUT WITT 7.1mm<br>J TUOTTT OOOO,<br>143mm<br>**----- End of picture text -----**<br>
312mm
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ll<br>10.8mm<br>**----- End of picture text -----**<br>
23.5mm
## Notes
Anti-Static PS Tray, Black .
- Electrical Resistance: 1 MΩ< R< 100MΩ . Thickness: T= 0.8 mm
- Carton Dimensions (L x W x H):
## Quantities
- 60 modules per Tray
- 600 modules per Box
- 4 Boxes per Carton
- 2400 modules per Carton
- 360mm x 325mm x 160mm
**LM931** Page 12 of 14
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Product LM931 Part No See Last Page
## **LM931 Bluetooth® low energy Module**
Standalone (With Embedded Bluetooth® v4.1 Stack)
## **Packaging for Tape & Reel / Tray**
The trays/reels are stacked and inserted into an anti-static vacuum bag, with the anti-static, model name and moisture sensitive labels affixed.
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**----- Start of picture text -----**<br>
Reels are place within a vacuum bag.<br>**----- End of picture text -----**<br>
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drying agent<br>Humidity Indicator Card<br>Anti-static aluminium vacuum bag.<br>**----- End of picture text -----**<br>
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**----- Start of picture text -----**<br>
Trays are stacked up with an empty tray on the top.<br>**----- End of picture text -----**<br>
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**----- Start of picture text -----**<br>
Model name label<br>aan =—<br>Anti-static aluminium vacuum bag. — DT<br>je<br> box<br>|<br>po<br>)<br>_a] — 7<br>box<br>carton<br>carton label<br>**----- End of picture text -----**<br>
Each carton contains 4 boxes.
**LM931** Page 13 of 14
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## **LM931 Bluetooth® low energy Module**
Standalone (With Embedded Bluetooth® v4.1 Stack)
Product LM931 Part No See Below
## **LM931 Packaging Options**
931-0551 **LM931 Module** 1 x LM931 SMT Plug & Play IC Antenna Module Retail Pack (RP) 931-0552 **LM931 Module** 1 x LM931 SMT Plug & Play IC Antenna Module Tray 931-0636 **LM931 Module** 1 x LM931 SMT Plug & Play IC Antenna Module Tape & Reel
**LM931** Page 14 of 14
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Updated at April 28, 2026
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