HCS300 Datasheet

IC型号：
HCS300
PDF描述：
KEELOQ® Code Hopping Encoder
文件大小：
542.70KB
PDF页数：
28页
芯片厂家：
Microchip

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HCS300

Code Hopping Encoder*

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 铿亁ed code (28-bit serial number,

4-bit button code, 2-bit status)

鈥?Encryption keys are read protected

鈥?/div>

PACKAGE TYPES

PDIP, SOIC

HCS300

LED

PWM

Operating

鈥?2.0鈥?.3V operation

鈥?Four button inputs

- No additional circuitry required

- 15 functions available

鈥?Selectable baud rate

鈥?Automatic code word completion

鈥?Battery low signal transmitted to receiver

鈥?Non-volatile synchronization data

HCS300 BLOCK DIAGRAM

Oscillator

Reset circuit

LED

LED driver

Controller

Power

latching

and

switching

EEPROM

Other

鈥?/div>

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

Synchronous transmission mode

PWM

32-bit shift register

Encoder

Button input port

Typical Applications

The HCS300 is ideal for Remote Keyless Entry (RKE)

applications. These applications include:

鈥?/div>

Automotive RKE systems

Automotive alarm systems

Automotive immobilizers

Gate and garage door openers

Identity tokens

Burglar alarm systems

The HCS300 combines a 32-bit hopping code

generated by a non-linear encryption algorithm, with a

28-bit serial number and six status bits to create a

66-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.

The encryption key, serial number, and con铿乬uration

data are stored in EEPROM which is not accessible via

any external connection. This makes the HCS300 a

very secure unit. The HCS300 provides an easy to use

serial interface for programming the necessary security

keys, system parameters, and con铿乬uration data.

The encyrption keys and code combinations are pro-

grammable but read-protected. The keys can only be

veri铿乪d after an automatic erase and programming

operation. This protects against attempts to gain

access to keys and manipulate synchronization values.

DESCRIPTION

The HCS300, from Microchip Technology Inc., is a code

hopping encoder designed for secure Remote Keyless

Entry (RKE) systems. The HCS300 utilizes the K

code hopping technology, which incorporates high secu-

rity, a small package outline and low cost, to make this

device a perfect solution for unidirectional remote key-

less entry systems and access control systems.

KeeLoq is a trademark of Microchip Technology Inc.

*Code hopping encoder patents allowed and pending.

漏

1996 Microchip Technology Inc.

Preliminary

This document was created with FrameMaker 4 0 4

DS21137D-page 1

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