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© Copyright 2003 Texas Instruments Incorporated.

11-07-22-003 11/03

The LF base station IC TMS3705ADR allows efficient development and

production of RFID readers for vehicle immobilizers. This base station

IC drives the antenna of a TI-RFid transponder system to send data modulated on the antenna signal, and

to detect and demodulate the response from the transponder. It allows also minimizing the external

component count.

Key functions:

-

Low current consumption in sleep mode

-

Automatic transponder frequency measurement and adaptation

-

Diagnosis function

-

Full bridge antenna driver

-

Built in band-pass filter and limiter

-

Digital FSK demodulator

-

High speed data transmission in synchronous mode

-

Power on reset

-

PLL

-

Short circuit protection

-

Support of all TI-RFID LF transponder functions

Specifications:

Part Number

RI-TMS3705ADR

Operating Frequency

Typical 134.2kHz, FSK

Operating Voltage

4.5V to 5.5V DC

Current Consumption

Charge Phase (without antenna load) typical 8 mA;

max. 20mA

Sleep Mode (without I/O currents)

typical 15

µA;

max. 0.2mA

Interface to Micro Controller

Two wire multifunctional serial interface, 15625 baud

Antenna Inductivity

400

µH - 700µH recommended

ESD Protection (MILSTD 883, HBM )

-2000V to +2000V

Operating Temperature

-40

°C to +85°C

Storage Temperature

-40

°C to +100°C (125°C up to 1000hrs over lifetime)

Package / Pin count

SO 16 (10 mm x 6 mm)

Packing / Delivery

Tape on Reel, 2500 units per reel

For more information, contact the sales office or distributor nearest you. This contact information can be found

on our web site at:

http://www.ti-rfid.com

LF Base Station IC

TMS3705ADR