Texas Instruments TMS3705A Datasheet

RADIO FREQUENCY IDENTIFICATION SYSTEMS

LF Base Station IC TMS3705A

The LF base station IC TMS3705A allows an efficient development and
production of handheld RFID readers & 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.

The key functions of the base station IC TMS3705A are:
» Self-adapting to transponders with a resonance frequency
between 129 kHz – 140 kHz
» Supports all TI-RFid LF transponder functions
» Asynchronous and synchronous data transmission to the IC
» Power management for 5V operation
» Internal full bridge antenna driver
» PLL for internal clock generation of 16 MHz
» Overcurrent protection of antenna driver

Specifications:

Part Number RI-TMS3705ADR

Operating Frequency Typical 134.2kHz, FSK
Operating Voltage 4.5V to 5.5V DC
Current Consumption

Interface to Micro Controller Two wire multifunctional serial interface, 15625 baud
Antenna Inductivity
ESD Protection (MILSTD 883) -2000V to +2000V
Operating Temperature
Storage Temperature
Package / Pin count SO 16 (10 mm x 6 mm)
Packing / Delivery Tape on Reel, 2500 units per reel

TIRIS TRANSPONDER

IC

Sample Set-up of a Transponder System
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on our web site at:

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technical areas, but does not have fu ll access to data concerning the uses and applications of customers products. Therefore, TI assumes no
responsibility for customer product design or for infringement of patents and/or the rights of third parties, which may result from assistance
provided by TI.

© Copyright 2002 Texas Instruments Incorporated. 11-07-22-003 07/02

Charge Phase (without antenna load) typical 8 mA; max. 20mA
Sleep Mode (without I/O currents) typical 15 µA; max. 0.2mA

400µH - 700µH recommended

-40°C to +85°C

-40°C to +100°C (125°C up to 1000hrs over lifetime)

T IRIS READER

READER
ANTENNA

TMS3705A

RF MODULE

+5 V

µC

C ONTRO L MO D UL E

POWER
SUPPLY

RS232
DRIVER

http://www.ti-rfid.com

+1 2 V

GND

RXD
TXD
GND