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© 2012 NXP Semiconductors N.V.

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Date of release: April 2012

Document order number: 9397 750 17269

Printed in the Netherlands

Powered by an external, single-cell lithium battery, the device

features a power-down mode, which minimizes quiescent

current.

The programmable power amplifier stabilizes the output power

to minimize carrier, over-temperature and battery-voltage

variations. Security transponder operation is compatible

with the PCF7936/37 & PCF7938 families, for simple system

upgrades. The transponder requires no battery supply, so full

operation is guaranteed, even when the battery is low.

A complete suite of on-chip memory is available. For customer

application software, up to 16 Kbyte of EROM are provided. For

extended data storage, the device offers 512 bytes of on-chip

EEPROM, with access control defined by the application.

brb380

IN1

leaded stick package

IN2

VBAT

MSDA

VFLD

CVFLD

15 nF

VDDA

XT1

XT2

PAOUT

Li

3 V

PCF7961

E-ROM

(ROM)

4 k

ROM

192 Byte

RAM

EEPROM

512 Byte

CALCULATION

UNIT

INTERRUPT

CONTROL

RC

OSCILLATOR

UHF

TRANSMITTER

TIMER

MODULATOR

I/O

POWER MANAGEMENT

VSS

buttons

MSCL

P22 1

P10

P11

P14

P15

P16

P21

VSSA

VSSPA

Note

1. Button inputs or generic I/O, however

external p'up resp. p'down required

PCF7961 block diagram