PCF7941ATJ datasheet(3/18 Pages) NXP

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NXP Semiconductors

Product Specification

Security Transponder and RISC Controller (STARC 2XLite)

PCF7x41ATJ

2013 Oct 15

CONFIDENTIAL

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

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.

Unless other products, the device comes with a package

integrated Transponder LF coil to operate as Security

Transponder and enable contactless communication with

the base station. Neither other external components nor an

additional battery supply is needed. The basic transponder

operation is emulated utilizing the on-chip RISC and may

feature a customized functions or may utilize the built in

Transponder Library, that offer HT2 functional compatible

operation (e.g. PCF7936), except for the ReadOnly mode.

The

Security Transponder operation features secure

contactless authentication, employing a Secret Key and a

random number in order to cipher any communication

between the device and the base station. The device

features a factory programmed unique serial number that

also serves as product type identification.

Device operation is controlled by a ROM or E-ROM

(FLASH like features) based RISC Controller, powered by

NXP’ low power 8-Bit MICRO RISC KERNEL (MRK

). 11

general purpose I/Os are provided for command buttons,

LED, or control of an external RF transmitter/transceiver

circuitry.

In case of Remote Keyless Entry applications, the

application

program

may

accomplish

rolling

code

generation using the hardwired Calculation Unit. The

Calculation Unit may operate in standard HITAG2 (48 bit

Shift Register) or Enhanced mode (64 bit Shift Register).

The RISC employs a 2 stage pipeline architecture in order

to execute an instruction in a single clock cycle. Device

timing

derived

from

on-chip

low

tolerance

RC Oscillator that provides a programmable system clock,

with a frequency up to 2 MHz. The system clock may also

be derived from the transponder interface, e.g. LF field

clock.

Depending on the operation mode, the RISC is powered

from the external battery or derives its power supply by

inductive coupling to the LF field generated by the base

station.

The

PCF7x41ATJ

incorporates

advanced

power

management that supports battery voltage measurement.

For increased battery lifetime the device quiescent current

is minimized in POWER-OFF state by disconnecting the

battery from most of the internal circuitry.

The device comes in a 36 pin Leaded Stick Package (LSP).

The device is available as E-ROM (FLASH like features)

and ROM coded product. In case of the E-ROM version,

in-circuit program download and debugging is supported.

For further detailed descriptions about features, functional

blocks and known anomalies not related to the integrated

Transponder

functionality,

please

refer

datasheet

PCF7x41A compiled for the SSOP and TSSOP package.

PCF7941ATJ Datasheet(PDF) 3 Page - NXP Semiconductors

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