© 1997 Microchip Technology Inc.

Preliminary

DS40158C-page 1

M

HCS410

FEATURES

Security

• Two programmable 64-bit encoder keys

• 16/32-bit bi-directional challenge and response

using one of two keys

• 69-bit transmission length

• 32-bit unidirectional code hopping, 37-bit

nonencrypted portion

• Encoder keys are read protected

• Programmable 28/32-bit serial number

• 60/64-bit, read-protected seed for secure learning

• Three IFF encryption algorithms

• Delayed increment mechanism

• Asynchronous transponder communication

• Queuing information transmitted

Operating

• 2.0V to 6.6V operation, 13V encoder only

operation

• Three switch inputs [S2, S1, S0]—seven functions

• Batteryless bi-directional transponder

• Selectable baud rate and code word blanking

• Automatic code word completion

• Battery low signal transmitted

• Nonvolatile synchronization

• PWM or Manchester RF encoding

• Combined transmitter, transponder operation

• Anti-collision of multiple transponders

• Passive proximity activation

• Device protected against reverse battery

• Intelligent damping for high Q LC-circuits

Other

• 37-bit nonencrypted part contains 28/32-bit serial

number, 4/0-bit function code, 1-bit battery low,

2-bit CRC, 2-bit queue

• Simple programming interface

• On-chip tunable RC oscillator (

±10%)

• On-chip EEPROM

• 64-bit user EEPROM in transponder mode

• Battery-low LED indication

• SQTP serialization quick-time programming

• 8-pin PDIP/SOIC/TSSOP and die

Typical Applications

• 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

PACKAGE TYPES

BLOCK DIAGRAM

S0

S1

S2/LED

LC1

LC0

PWM

GND

18

2

3

4

7

6

5

PDIP, SOIC

S2/LED

LC1

GND

PWM

1

2

3

4

8

7

6

5

S1

S0

LC0

TSSOP

Oscillator

Configuration Register

Power

Control

Wakeup

Logic

Address

DecodingEEPROM

Debounce

Control

and

Queuer

LED

Control

PWM

Driver

PPM

Detector

PWM

PPM

Manch.

Encoder

S0

S1

S2

LCI0

LCI1

PWM

Code Hopping Encoder and Transponder*

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