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GENERAL DESCRIPTION

The PCF7x41ATJ is a high performance single chip Security Transponder and RISC Controller, ideally suited for automotive applications with combined vehicle Immobilization and Remote Keyless Entry functions.

FEATURES

? Single chip Security Transponder and Remote Keyless

Entry solution

? RISC programmable device features

? Up to seven Keyless Entry command buttons

? 512 Byte EEPROM for extended data storage

? 32 bit unique device and product type identification

? Package integrated Transponder LF coil

Security Transponder

? Transponder operation like PCF7936 family

? Fast mutual authentication, 39ms (48 bit Secret Key)

? EEPROM read/write protection capability

? RISC programmable transponder extensions

Calculation Unit

? Hardwired security algorithm

? 48 (96) bit Secret Key

RISC Controller and Peripherals

? 8 Bit RISC Architecture (MRK ??)

? 4 kByte E-ROM respectively ROM (application)

? 4 kByte ROM (device firmware and library functions)

? 128 Byte User RAM

? 11 general purpose I/O (incl. 7 command button inputs)

? Two 8 Bit Timer/Counter

? Optional external clock input for Timer/Counter

? Watchdog

? Single level interrupt architecture

? On-chip RC Oscillator (< ?8)

? Short instruction execution time (as fast as 0.5 ?s)

? Programmable battery low detection

? Low power consumption

RUN: 300 ?A, IDLE: 20?A, PD: 100 nA

? Single Lithium cell operation, 2.1V to 3.6V