HCS515-I(2002) View Datasheet(PDF) - Microchip Technology

Part Name

Description

MFG CO.

HCS515-I
(Rev.:2002)

KEELOQ® Code Hopping Decoder

Microchip Technology 

HCS515

FIGURE 1-3:

BASIC OPERATION OF RECEIVER (DECODER)

1 Received Information

Button Press

Information

Serial Number

32 Bits of

Encrypted Data

EEPROM Array

Manufacturer Code

2

Check for

Match

Perform Function

5

Indicated by

button press

3

KEELOQ

Decryption

Algorithm

Decrypted

Synchronization

Counter

Serial Number

Sync Counter

Crypt Key

4

Check for

Match

NOTE: Circled numbers indicate the order of execution.

2.0 PIN ASSIGNMENT

PIN

1

2

3

4

5

6

7

8

9

10

11

12

13

14

Note:

Decoder

Function

I/O(1)

Buffer

Type(1)

Description

NC

—

—

No connection

NC

—

—

No connection

VDD

—

—

Power connection

S1

O

TTL S1 function output

S0

O

TTL S0 function output

MCLR

I

ST

Master clear input

NC

—

—

No connection

NC

—

—

No connection

S_DAT

I/O

TTL Synchronous data from controller

S_CLK

I

TTL Synchronous clock from controller

RF_IN

I

TTL Input from RF receiver

GND

—

—

Ground connection

NC

—

—

No connection

NC

—

—

No connection

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

DS40183D-page 4

© 2002 Microchip Technology Inc.

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