TMS3705

Product Folder Order Now Technical Documents Tools & Software Support & Community TMS3705 SCBS881E – JANUARY 2010 – REVISED OCTOBER 2018 TMS3705 Transponder Base Station IC 1 Device Overview 1.1 Features 1 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 1.2 Applications Car Access Immobilization Building Access Livestock Reader 1.3 Description 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: 1. The microcontroller and bas...