HCS500-ISLASHP datasheet(4/34 Pages) MICROCHIP

4 / 34 page

HCS500

DS40153C-page 4

FIGURE 1-3:

BASIC OPERATION OF RECEIVER (DECODER)

Note: Circled numbers indicate the order of execution.

2.0

PIN ASSIGNMENT

Button Press

Information

EEPROM Array

Manufacturer Code

32 Bits of

Encrypted Data

Serial Number

Received Information

Decrypted

Synchronization

Counter

Check for

Match

Sync Counter

Serial Number

KEELOQ

Decryption

Algorithm

Check for

Match

Perform Function

Indicated by

button press

Crypt Key

Decoder

Function

I/O(1)

Buffer

Type(1)

Description

1VDD

—

Power Connection

EE_CLK

OTTL

Clock to I 2C™ EEPROM

EE_DAT

I/O

TTL

Data to I2C EEPROM

4MCLR

Master clear input

S_DAT

I/O

TTL

Synchronous data from controller

S_CLK

TTL

Synchronous clock from controller

RFIN

TTL

RF input from receiver

8GND

—

Ground connection

Note: P = power, I = in, O = out, and ST = Schmitt Trigger input.

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