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Two programmable 32-bit serial numbers

Two programmable 64-bit crypt keys

Two programmable 60-bit seed values

Each transmission is unique

67/69-bit transmission code length

32-bit hopping code

Crypt keys are read protected

PACKAGE TYPES

PDIP, SOIC

S0

S1

S2

S3/SHIFT/

RFEN

1

8

V

DD

LED

DATA

Vss

HCS365

2

3

4

7

6

5

Operating

鈥?/div>

2.05-5.5V operation

Four button inputs

15 functions available

Four selectable baud rates

Selectable minimum code word completion

Battery low signal transmitted to receiver

Nonvolatile synchronization data

PWM, VPWM, PPM, and Manchester modulation

Button queue information transmitted

Dual Encoder functionality

HCS365 BLOCK DIAGRAM

Oscillator

RESET circuit

LED

LED driver

Controller

Power

latching

and

switching

EEPROM

Encoder

DATA

32-bit SHIFT register

V

SS

V

DD

S3/SHIFT S2 S

1

S

0

RFEN

Button input port

Other

鈥?On-chip EEPROM

鈥?On-chip tuned oscillator (鹵10% over voltage and

temperature)

鈥?Button inputs have internal pull-down resistors

鈥?LED output

鈥?PLL control for ASK and FSK

鈥?Low external component count

GENERAL DESCRIPTION

The HCS365 is a code hopping encoder designed for

secure Remote Keyless Entry (RKE) and secure

remote control systems. The HCS365 utilizes the

K

EE

L

OQ 廬

code hopping technology, which incorpo-

rates high security, a small package outline, and low

cost to make this device a perfect solution for unidirec-

tional authentication systems and access control sys-

tems.

The HCS365 combines a hopping code generated by a

nonlinear encryption algorithm, a serial number, and

status bits to create a secure transmission code. The

length of the transmission eliminates the threat of code

scanning and code grabbing access techniques.

Typical Applications

The HCS365 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

漏

2002 Microchip Technology Inc.

Preliminary

DS41109D-page 1

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