HCS361-IP Microchip Technology, HCS361-IP Datasheet

HCS361-IP

Manufacturer Part Number

HCS361-IP

Description

KEELOQ CODE HOPPING ENCODER

Manufacturer

Microchip Technology

Datasheet

1.HCS361-IP.pdf (24 pages)

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FEATURES

Security

• Programmable 28/32-bit serial number

• Programmable 64-bit encryption key

• Each transmission is unique

• 67-bit transmission code length

• 32-bit hopping code

• 35-bit ﬁxed code (28/32-bit serial number,

• Encryption keys are read protected

Operating

• 2.0-6.6V operation

• Four button inputs

• Selectable baud rate

• Automatic code word completion

• Battery low signal transmitted to receiver

• Nonvolatile synchronization data

• PWM and VPWM modulation

Other

• Easy to use programming interface

• On-chip EEPROM

• On-chip oscillator and timing components

• Button inputs have internal pulldown resistors

• Current limiting on LED output

• Minimum component count

Enhanced Features Over HCS300

• 48-bit seed vs. 32-bit seed

• 2-bit CRC for error detection

• 28/32-bit serial number select

• Two seed transmission methods

• PWM and VPWM modulation

• Wake-up signal in VPWM mode

• IR modulation mode

Typical Applications

The HCS361 is ideal for Remote Keyless Entry (RKE)

applications. These applications include:

• Automotive RKE systems

• Automotive alarm systems

• Automotive immobilizers

• Gate and garage door openers

• Identity tokens

• Burglar alarm systems

*Code hopping encoder patents issued in Europe, U. S. A., R. S. A. — US: 5,517,187; Europe: 0459781

4/0-bit function code, 1-bit status, 2-bit CRC)

- 15 functions available

1996 Microchip Technology Inc.

is a trademark of Microchip Technology Inc.

Code Hopping Encoder*

Preliminary

PACKAGE TYPES

HCS361 BLOCK DIAGRAM

DESCRIPTION

The HCS361 is a code hopping encoder designed for

secure Remote Keyless Entry (RKE) systems. The

HCS361 utilizes the K

which incorporates high security, a small package

outline and low cost, to make this device a perfect

solution for unidirectional remote keyless entry systems

and access control systems.

The HCS361 combines a 32-bit hopping code

generated by a nonlinear encryption algorithm, with a

28/32-bit serial number and 7/3 status bits to create a

67-bit transmission stream. The length of the

transmission eliminates the threat of code scanning

and the code hopping mechanism makes each

transmission unique, thus rendering code capture and

resend (code grabbing) schemes useless.

PDIP, SOIC

PWM

LED

Reset circuit

Oscillator

LED driver

EEPROM

HCS361

32-bit shift register

code hopping technology,

Button input port

Controller

DS40146C-page 1

Encoder

LED

PWM

Power

latching

and

switching

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