HCS500 datasheet(1/40 Pages) MICROCHIP

Part #	HCS500

Description	KEELOQ짰 Code Hopping Decoder encoders to implement a unidirectional

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Manufacturer	MICROCHIP [Microchip Technology]

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DS40153D-page 1

HCS500

FEATURES

Security

• Encrypted storage of manufacturer’s code

• Encrypted storage of crypt keys

• Up to seven transmitters can be learned

•KEELOQ® code hopping technology

• Normal and Secure learning mechanisms

Operating

• 3.0V—5.5V operation

• Internal oscillator

• Auto bit rate detection

Other

• Stand-alone decoder chipset

• External EEPROM for transmitter storage

• Synchronous serial interface

• 1 Kbit user EEPROM

• 8-pin DIP/SOIC package

Typical Applications

• Automotive remote entry systems

• Automotive alarm systems

• Automotive immobilizers

• Gate and garage openers

• Electronic door locks

• Identity tokens

• Burglar alarm systems

Compatible Encoders

All KEELOQ encoders and transponders configured for

the following setting:

• PWM modulation format (1/3-2/3)

•TE in the range from 100us to 400us

• 10 x TE Header

• 28-bit Serial Number

• 16-bit Synchronization counter

• Discrimination bits equal to Serial Number 8 LSbs

• 66- to 69-bit length code word.

DESCRIPTION

The Microchip Technology Inc. HCS500 is a code hop-

ping decoder designed for secure Remote Keyless

Entry (RKE) systems. The HCS500 utilizes the pat-

ented KEELOQ code hopping system and high security

learning mechanisms to make this a canned solution

when used with the HCS encoders to implement a uni-

directional remote and access control systems. The

HCS500 can be used as a stand-alone decoder or in

conjunction with a microcontroller.

PACKAGE TYPE

BLOCK DIAGRAM

The manufacturer’s code, crypt keys, and synchroniza-

tion information are stored in encrypted form in external

EEPROM. The HCS500 uses the S_DAT and S_CLK

inputs to communicate with a host controller device.

The HCS500 operates over a wide voltage range of

3.0 volts to 5.5 volts. The decoder employs automatic

bit-rate detection, which allows it to compensate for

wide variations in transmitter data rate. The decoder

contains sophisticated error checking algorithms to

ensure only valid codes are accepted.

PDIP, SOIC

1

2

3

4

VDD

EE_CLK

EE_DAT

MCLR

8

7

6

5

VSS

RFIN

S_CLK

S_DAT

Reception Register

External

CONTROL

DECRYPTOR

RFIN

OSCILLATOR

S_DAT

S_CLK

MCLR

EEPROM

EE_DAT

EE_CLK

KEELOQ® Code Hopping Decoder

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