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HCS500 Datasheet(PDF) 4 Page - Microchip Technology

Part # HCS500
Description  KEELOQ짰 Code Hopping Decoder encoders to implement a unidirectional
PDF  40 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

HCS500 Datasheet(HTML) 4 Page - Microchip Technology

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HCS500
DS40153D-page 4
© 2011 Microchip Technology Inc.
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
1
3
4
Check for
Match
2
Perform Function
Indicated by
button press
5
Crypt Key
PIN
Decoder
Function
I/O(1)
Buffer
Type(1)
Description
1
VDD
P—
Power Connection
2
EE_CLK
OTTL
Clock to I2C™ EEPROM
3
EE_DAT
I/O
TTL
Data to I2C EEPROM
4
MCLR
IST
Master clear input
5
S_DAT
I/O
TTL
Synchronous data from controller
6
S_CLK
ITTL
Synchronous clock from controller
7
RFIN
ITTL
RF input from receiver
8
GND
P—
Ground connection
Note: P = power, I = in, O = out, and ST = Schmitt Trigger input.



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