HCS515 datasheet(4/38 Pages) MICROCHIP

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HCS515

DS40183E-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

—

No connection

—

No connection

3VDD

—

Power connection

TTL

S1 function output

TTL

S0 function output

6MCLR

Master clear input

—

No connection

—

No connection

S_DAT

I/O

TTL

Synchronous data from controller

S_CLK

TTL

Synchronous clock from controller

RF_IN

TTL

Input from RF receiver

GND

—

Ground connection

—

No connection

—

No connection

Note:

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

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