Product details


Frequency 134.2 kHz Standard ISO 11785 Operating temperature range (C) -40 to 85 Rating Automotive Transmission principle HDX - FSK open-in-new Find other Other wireless technologies

Package | Pins | Size

SOIC (D) 16 59 mm² 9.9 x 6 open-in-new Find other Other wireless technologies


  • Base Station IC for TI-RFid™ RF Identification Systems
  • Drives Antenna
  • Sends Modulated Data to Antenna
  • Detects and Demodulates Transponder Response (FSK)
  • Short-Circuit Protection
  • Diagnosis
  • Sleep-Mode Supply Current: 0.2 mA
  • Designed for Automotive Requirements
  • 16-Pin SOIC (D) Package

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The TMS3705 transponder base station IC is used to drive the antenna of a TI-RFid transponder system, to send data modulated on the antenna signal, and to detect and demodulate the response of the transponder. The response of the transponder is a frequency shift keyed (FSK) signal. The high or low bits are coded in two different high-frequency signals (134.2 kHz for low bits and 123 kHz for high bits, nominal). The transponder induces these signals in the antenna coil according an internally stored code. The energy that the transponder needs to send out the data is stored in a charge capacitor in the transponder. The antenna field charges this capacitor in a preceding charge phase. The IC has an interface to an external microcontroller.

There are two configurations for the clock supply to both the microcontroller and the base station IC:

The base station IC has an on-chip PLL that generates a clock frequency of 16 MHz for internal clock supply only. Only TMS3705DDRQ1 is recommended in combination with AES transponder products (for example, TRPWS21GTEA or RF430F5xxx). TMS3705EDRQ1 is recommended for best performance in combination with DST40, DST80, MPT transponders (for example, TMS37145TEAx, TMS37126xx, TMS37x128xx, TMS37x136xx, TMS37x158xx, RI-TRP-DR2B-xx, RI-TRP-BRHP-xx) and cannot be used in combination with AES transponder products.

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Technical documentation

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Type Title Date
* Data sheet TMS3705 Transponder Base Station IC datasheet (Rev. E) Oct. 31, 2018
Application note Integrated TIRIS RF Module TMS3705A Introduction to Low Frequency Reader (Rev. A) Mar. 06, 2020
Technical article Bluetooth® Low Energy shifts gears for car access Jul. 15, 2019
Technical article An out-of-the-box Internet of Things: building a seamless and secure smart home network Jun. 12, 2018
Technical article Thread vs. Zigbee – what’s the difference? May 16, 2018
Technical article Your microcontroller deserves a nap – designing “sleepy” wireless applications Mar. 28, 2018
Application note TMS3705 Range Extender Power Solution Using UCC27424-Q1 Aug. 09, 2012
Application note TMS3705 Passive Antenna Solution Jul. 12, 2010
More literature MSP430 Ultra-Low-Power MCUs and TI-RFid Devices Apr. 03, 2009

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