HCS500 datasheet(4/40 Pages) MICROCHIP

No de pièce	HCS500

Description	KEELOQ짰 Code Hopping Decoder encoders to implement a unidirectional

PDF	40 Pages

Scroll/Zoom	100%

Fabricant	MICROCHIP [Microchip Technology]

Site Internet	http://www.microchip.com

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4 / 40 page

HCS500

DS40153D-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

VDD

P—

Power Connection

EE_CLK

OTTL

Clock to I2C™ EEPROM

EE_DAT

I/O

TTL

Data to I2C EEPROM

MCLR

IST

Master clear input

S_DAT

I/O

TTL

Synchronous data from controller

S_CLK

ITTL

Synchronous clock from controller

RFIN

ITTL

RF input from receiver

GND

P—

Ground connection

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

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