HCS201_11 datasheet(1/36 Pages) MICROCHIP

Part #	HCS201

Description	KEELOQ짰 Code Hopping Encoder 34-bit fixed code (28-bit serial number

PDF	36 Pages

Scroll/Zoom	100%

Manufacturer	MICROCHIP [Microchip Technology]

Direct Link	http://www.microchip.com

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1 / 36 page

DS41098D-page 1

FEATURES

Security

• Programmable 28-bit serial number

• Programmable 64-bit encryption key

• Each transmission is unique

• 66-bit transmission code length

• 32-bit hopping code

• 34-bit fixed code (28-bit serial number,

4-bit button code, 2-bit status)

• Encryption keys are read protected

Operating

• 3.5V-13V operation

(2.0V min. using the Step up feature)

• Three button inputs

• 7 functions available

• Selectable baud rate

• Automatic code word completion

• Battery low signal transmitted to receiver

• Non-volatile synchronization data

Other

• Simple programming interface

• On-chip EEPROM

• On-chip oscillator and timing components

• Button inputs have internal pull-down resistors

• Minimum component count

• Synchronous Transmission mode

• Built-in step up regulator

Typical Applications

• The HCS201 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

DESCRIPTION

The HCS201 from Microchip Technology Inc. is a code

hopping encoder designed for secure Remote Keyless

Entry (RKE) systems. The HCS201 utilizes the

KEELOQ® code hopping technology, incorporating high

security, a small package outline and low cost. The

HCS201 is a perfect solution for unidirectional remote

keyless entry systems and access control systems.

PACKAGE TYPES

HCS201 BLOCK DIAGRAM

The HCS201 combines a 32-bit hopping code,

generated by a nonlinear encryption algorithm, with a

28-bit serial number and 6 information bits to create a

66-bit code word. The code word length eliminates the

threat of code scanning and the code hopping mecha-

nism makes each transmission unique, thus rendering

code capture and resend schemes useless.

1

2

3

4

8

7

6

5

S0

S1

S2

VDDB

VDD

STEP

DATA

VSS

PDIP, SOIC

VSS

VDD

Oscillator

RESET circuit

Controller

Power

latching

and

switching

Button input port

32-bit shift register

Encoder

EEPROM

DATA

S2 S1 S0

Step Up

Controller

VDDB

VDD

STEP

HCS201

KEELOQ® Code Hopping Encoder

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HCS201 Datasheet(PDF) 1 Page - Microchip Technology

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