STN2100 OBD-II to UART Interpreter IC

Part No.: MPST-STN2100-OBD-II-to-UART-Interpreter-IC
STN2100 offers twice as much flash and four times as much RAM, while keeping the same low cost as STN1110.


STN2100 OBD-II to UART Interpreter IC

STN2100 offers the same features and functionality as STN1110 with even higher performance. STN2100 offers twice as much flash and four times as much RAM, while keeping the same low cost as STN1110.



STN2100 is a 28-pin OBD to UART interpreter IC that provides bi-directional, half-duplex communication with all vehicle OBD-II legislated protocols. STN2100 has all the functionality of and the same price as STN1110, yet has twice as much flash and four times as much RAM, allowing for more features to be included with future firmware updates and higher performance.


Key Features

  • Configurable GPIO pins.
  • Safe, secure bootloader. Reflash the firmware in the field, even over a poor quality link and avoid expensive product recalls.
  • Fully compatible with ELM327 command set, ensuring out-of-the-box compatibility with the dozens of existing software applications.
  • Extended “ST” command set provides access to enhanced functionality, without compromising compatibility.
  • PowerSave mode with multiple sleep and wakeup triggers. Ideal for permanent in-vehicle setups, device can be left connected for extended periods of time without draining the battery.
  • Perfect form factor for any application. STN2120 is available in the QFN28 package.
  • RoHS compliant


  • Solid, field-tested software. STN2100 runs the same proven code that powers the popular STN1110 and OBDLink family of PC-based OBD interfaces. Thanks to its large user base, any problems are discovered and corrected quickly.
  • Large OBD message buffer. STN2100 has over five times as much RAM as its nearest competitor, virtually eliminating BUFFER OVERFLOW errors.
  • Automatic protocol detection algorithm is continuously fine-tuned to insure that STN2100 will connect to the widest array of vehicles, even those that do not fully conform to the OBD-II standard.

Powersave Sleep & Wakeup Triggers

The diagram shows the various triggers available in the STNxxxx family of ICs.

PowerSave Diagram


Device Weight 0.0064 oz (0.18 g)
Dimensions 8.04 x 8.04 x 0.87 mm
Operating Voltage 3-3.6V DC
Operating Current 63 mA
Battery SaverTM Mode < 2 mA
Operating Temperature -4º to 185ºF (-40º to 85ºC)



  • All legislated OBD-II protocols
    • ISO 15765-4 (CAN 250/500 Kbps, 11/29 bit)
    • ISO 14230-4 (Keyword Protocol 2000)
    • ISO 9141-2 (Asian, European, Chrysler)
    • SAE J1850 VPW (GM)
    • SAE J1850 PWM (Ford)
  • Non-legislatd OBD-II protocols
    • ISO 15765
    • ISO 11898 (raw CAN)
  • SAE J1939 OBD protocol used in heavy-duty vehicles