HCS500T-ISLASHST datasheet(4/42 Pages) MICROCHIP

4 / 42 page

HCS500

DS40000153E-page 4

 2001-2015 Microchip Technology Inc.

FIGURE 1-3:

BASIC OPERATION OF RECEIVER (DECODER)

Note: Circled numbers indicate the order of execution.

2.0

PIN ASSIGNMENT

The description of the pins of the HCS500 decoder is

provided in Table 2-1.

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

TABLE 2-1:

DECODER PIN ASSIGNMENT

Decoder

Function

I/O(1)

Buffer Type(1)

Description

1VDD

—

Power Connection

EE_CLK

TTL

Clock to I 2C™ EEPROM

EE_DAT

I/O

TTL

Data to I 2C™ 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

GND

—

Ground connection

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

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