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Programmable 64-bit encoder crypt key

Two 64-bit IFF keys

Keys are read protected

32-bit bi-directional challenge and response using

one of two possible keys

69-bit transmission length

鈥?32-bit hopping code,

鈥?37-bit nonencrypted portion

Programmable 28/32-bit serial number

60-bit, read protected seed for secure learning

Two IFF encryption algorithms

Delayed counter increment mechanism

Asynchronous transponder communication

Transmissions include button Queuing

information

PACKAGE TYPES

PDIP, SOIC

S0

S1

S2/RFEN/LC1

LC0

1

8

V

DD

LED

DATA

GND

HCS412

2

3

4

7

6

5

BLOCK DIAGRAM

V

DD

Power

Control

Oscillator

鈥?/div>

Configuration Register

S0

S1

Debounce

Control

and

Queuer

Address EEPROM

Decoding

Wake-up

Logic

LED

鈥?/div>

2.0V to 6.3V operation

Three switch inputs: S2, S1, S0 鈥?seven functions

Battery-less bi-directional transponder capability

Selectable baud rate and code word blanking

Automatic code word completion

Battery low detector

PWM or Manchester data encoding

Combined transmitter, transponder operation

Anticollision of multiple transponders

Passive proximity activation

Device protected against reverse battery

Intelligent damping for high Q LC-circuits

100 mV

PP

sensitive LC input

Transponder

Circuitry

LC0

RFEN/S2/LC1

PPM

Detector

DATA

PPM

Manch.

Encoder

DATA

Driver

Other

鈥?/div>

Simple programming interface

On-chip tunable RC oscillator, 鹵 10%

On-chip EEPROM

64-bit user EEPROM in Transponder mode

Battery-low LED indication

Serialized Quick Turn Programming (SQTP

SM

)

8-pin PDIP/SOIC

RF Enable output

ASK and FSK PLL interface option

Built in LC input amplifier

Typical Applications

鈥?/div>

Automotive remote entry systems

Automotive alarm systems

Automotive immobilizers

Gate and garage openers

Electronic door locks (Home/Office/Hotel)

Burglar alarm systems

Proximity access control

漏

2002 Microchip Technology Inc.

Preliminary

DS41099C-page 1

Register

LED

Control

Control Logic

and Counters

Operating

Encryption/Increment

Logic

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