LM068-1103

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## **LM068 Bluetooth® 5.0 Dual Mode RS232 Serial Adapter** Standalone (With Embedded Bluetooth® 5.0 Stack) 

Revised 19/JAN/2021 Datasheet Version 1.4 Ordering Options See last page 

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46.3mm<br>16mm<br>Sy<br>34mm<br>**----- End of picture text -----**<br>


## **Features** 

World’s smallest Bluetooth® 5.0 Serial Adapter 

Low Power Consumption 

- Applications available including SPP with GAP Central,  SPP or GAP Peripheral and SPP to Serial Bridge 

Serial (RS232) interface 

- 46.3mm x 34mm x 16mm 

Over-the-Air Upgrade (OTAU) available 

Powered by USB or Pin 9 

DTE / DCE (Master / Slave) mode switch 

DTR / DSR Handshaking and RTS / CTS Flow control lines 

RoHS, REACH and WEEE Compliant Solution 

Full Duplex for simultaneous communication between sender and receiver 

## **Overview** 

The LM068 is the world’s smallest Bluetooth® 5.0 serial adapter (RS232), providing a secure and reliable Bluetooth® 5.0 connection. 

Designed to replace RS232 cables between a master (DTE) device and slave (DCE) devices such as printers, data loggers and digital signalling devices. This standalone adapter incorporates a micro-controller unit with an 8 Mbit flash memory for running the application. 

used to change the configurations, plus the developer can also configure and modify the settings of a remote LM068 from a local LM068. 

between Bluetooth® 5.0 and is backward compatible with 2.0, v2.1 and Bluetooth® v4.0, v4.1 devices, using our SPP to Serial Bridge application.We also offer SPP with GAP Central and SPP or GAP Peripheral applications. 

+44 (0) 207 428 2647 

www.lm-technologies.com/contact 

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## **LM068 Bluetooth® 5.0 Dual Mode RS232 Serial Adapter** 

Standalone (With Embedded Bluetooth® 5.0 Stack) 

## 

|**General Specification**||
|---|---|
|Wireless||
|Bluetooth® Standard|5.0 (Dual Mode)|
|Adapter Type|Standalone (Configurable with AT Commands)|
|Profiles|SPP and GATT-Based|
|Hardware||
|Chipset|Qualcomm|
|Antenna|IC Antenna Onboard|
|Microcontroller (MCU)|16-bit RISC 80 MHz MCU|
|Flash Memory|8 Mbit|
|RAM|56 KB (12K x 24-bit)|
|Program Interface|SPI|
|Interfaces|Serial (RS232)|
|Power Supply|5V (USB) or 4V - 12V (Pin 9)|
|Crystal Oscillator|26 MHz|
|LED Indicators|Blink (BLUE), SPP (ORANGE) and LE Connection (RED) (TBC)|
|RS232 (Serial)||
|Interface|D_SUB 9 pin female|
|Signal|RxD, TxD, DTR, DSR, RTS, CTS and GND|
|Full Duplex|Yes|
|Baud Rate|9.6, 19.2, 38.4, 57.6, 115.2, 230.4, 460.8, 921.6 and 1382.4 Kbps|
|RF Characteristics||
|Tx Output Power|TBA|
|Rx Sensitivity|TBA|
|Antenna Gain|1 dBi to 3 dBi (Typical)|
|Range (in open space)|TBA|
|Data Rate|Up to 3Mbps|
|Frequency|2.4 GHz to 2.485 GHz|
|Physical Characteristics||
|Operating Temperature|TBA|
|Dimensions (L x W x H)|46.3mm x 34mm x 16mm|
|Weight|19.16g|
|Certifications|See our website for this products certifications|
|Compliance|RoHS, REACH and WEEE|



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Page 3 of 9 

## **LM068 Bluetooth® 5.0 Dual Mode RS232 Serial Adapter** 

Standalone (With Embedded Bluetooth® 5.0 Stack) 

## **Firmware** 

controls the primary operations such as information enquiry, connection/disconnection set up and settings. The LM068 module can be configured via its UART interface from a microcontroller or computer, using MCU software or a serial terminal (e.g. Hercules SETUP utility) respectively. At the start of every power up cycle the LM068 enters the configuration mode. 

When the LM068 is connected to another Bluetooth device it enters into data mode. In data mode, users can send/receive data between the module and the remote device via UART. To exit data mode, the user can use the escape sequence. If the LM068 responds with “OK” to the escape sequence it enters into the online_command_mode (i.e. the connection is still active, AT commands can be entered via UART or the connection can be dropped). The LM068 can re-enter into data mode by using AT commands. 

## **Default Factory Settings** 

## Device Settings 

Discoverable: ON Device Name: LM068_SPP+GAPCEN_0106 Echo of command: ON Response to commands: ON Pairable State: ON 

UART Settings Baud rate : 19200 Stop bit : ONE Parity bits: NONE Flow Control: OFF 

SPP Role: Dual Escape sequence check enabled: YES 

Bluetooth® low energy Settings 

GAP Role: Central or Peripheral (dependent on the application) 

## Security Settings 

Pin: 1234 DPIN: OFF MITM: OFF IOTYPE: No Input Output 

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## **LM068 Bluetooth® 5.0 Dual Mode RS232 Serial Adapter** 

Standalone (With Embedded Bluetooth® 5.0 Stack) 

## **Bluetooth® Applications** 

The LM068 module can run full application code for a wide range of industries. This includes the M2M (industrial cable replacement), EPOS, health & fitness and consumer electronics industries. 

The LM068 modules can run all Bluetooth® applications. Depending on whether the embedded developer requires a Bluetooth® low energy connection, a high-quality data stream Bluetooth® connection or both simultaneously. 

Alert Tag Health Thermometer Beacon Heart Rate Sensor Blood Pressure Sensor Keyboard & Mouse Cycling Speed and Cadence Sensor Multifunction Steering Wheel Environment Sensor Printer 

Security Tag Serial Communication Time Client Temperature and Pressure Weight Scale 

## **Firmware Available** 

SPP with GAP Central 

SPP or GAP Peripheral SPP to Serial Bridge 

+44 (0) 207 428 2647 www.lm-technologies.com/contact 

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## **LM068 Bluetooth® 5.0 Dual Mode RS232 Serial Adapter** 

Standalone (With Embedded Bluetooth® 5.0 Stack) 

## **Signals** 

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## **Pin out for LM068 Adapter** 

|Pin|RS232 Signal|RS232 Signal|DTE to DCE Direction|DCE to DTE Direction|Description|
|---|---|---|---|---|---|
|1|CD||Input|Output|Not Connected|
|2|RxD||Input|Output|Receive Data|
|3|TxD||Output|Input|Transmit Data|
|4|DTR||Output|Input|Data Terminal Ready|
|5|GND||n/a|n/a|Signal Ground|
|6|DSR||Input|Output|Data Set Ready|
|7|RTS||Output|Input|Request to Send|
|8|CTS||Input|Output|Clear to Send|
|9|Vcc||Input|Input|Power Supply|



## **Factory Settings** 

The factory settings of the COM Port are as follows: 

Baud Rate 19200 bps Data Bits 8 Parity None Stop Bits 1 Flow Control None 

and Flow Control Settings. 

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## **LM068 Bluetooth® 5.0 Dual Mode RS232 Serial Adapter** 

Standalone (With Embedded Bluetooth® 5.0 Stack) 

## **Hardware Structure** 

- **1** Blink LED. 

- **2** SPP LED. 

- **3** LE Connection LED. 

- **4** Mini USB Connector. **5** RS232 Connector. **6** Slide Switch. 

- **7** Reset Button. 

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## **Switch Functions** 

Reset Button 

By pressing the Reset Button you can: 

Disconnect a wireless connection (after a short press). Restore the factory settings (after over 3 seconds press). 

## Slide Switch 

The slide switch can swap TxD / RxD, RTS / CTS and DTR / DSR Signals. By switching, you can set the adapter as a DTE (towards antenna connector) or a DCE (towards RS232 connector). 

## **Physical Dimensions** 

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## **LM068 Bluetooth® 5.0 Dual Mode RS232 Serial Adapter** 

Standalone (With Embedded Bluetooth® 5.0 Stack) 

## **Block Diagram** 

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VDD<br>ANT<br>Filter BT_RF<br>SPI (Debug)<br>CSR Chipset<br>Serial (RS232)<br>FLASH<br>8 Mbit<br>SIO<br>XTAL<br>26MHz<br>LM068<br>**----- End of picture text -----**<br>


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Page 8 of 9 

## **LM068 Bluetooth® 5.0 Dual Mode RS232 Serial Adapter** 

Standalone (With Embedded Bluetooth® 5.0 Stack) 

## **Datasheet Version Notes** 

v1.0 13 MAR 2018 Added version notes to datasheet. v1.1 14 MAR 2018 Removed unsupported baud rate. Updated default firmware name and settings. v1.2 22 MAY 2019 Updated Bluetooth® core version references. v1.3 24 JUL 2019 Packing Page Revised and Extra Options added v1.4 19 JAN 2021 Datasheet branding updates. 

## **Helpful Notes** 

## **1** OC 

**Download the latest software and from** 

lm-technologies.com/btserial 

**Download any further documention to assist with your** 

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**device setup, such as;** 

Manual, Quick Start & Pairing Guides, Troubleshooting, Notes, Certifications, Applications and Datasheet. 

**3 Need support? Visit our FAQ Support Site** $ lm-technologies.com/support 

+44 (0) 207 428 2647 www.lm-technologies.com/contact 

Page 9 of 9 

## **LM068 Bluetooth® 5.0 Dual Mode RS232 Serial Adapter** 

Standalone (With Embedded Bluetooth® 5.0 Stack) 

## **Ordering Options** 

**068-1100 AO - Adapter Only** 1 x Bluetooth® 5.0 Serial Adapter **068-1102 SWB - Single White Box** 1 x Bluetooth® 5.0 Serial Adapter 1 x DB9 Gender Changer - male to male **068-1101 SRP - Single Retail Pack** 1 x Bluetooth® 5.0 Serial Adapter 1 x DB9 Gender Changer - male to male 1 x USB - mini USB Cable for power supply 1 x Power Supply Unit with Multi-Plug faces **068-1104 TWB - Twin White Box** 2 x Bluetooth® 5.0 Serial Adapters 1 x DB9 Gender Changers - male to male **068-1103 TRP - Twin Retail Pack** 2 x Bluetooth® 5.0 Serial Adapters 1 x DB9 Gender Changers - male to male 1 x USB mini USB Cable for power supply 1 x Power Supply Unit with Multi-Plug faces Optional - LM025 &eeeJ Slim Line 9 pin to 25 pin Convertor 

See our website to download any applicable Product Software, Manuals and Notes  - http://www.lm-technologies.com/downloads 

+44 (0) 207 428 2647 www.lm-technologies.com/contact