hcs500 Microchip Technology Inc., hcs500 Datasheet - Page 4

• Manufacturer Part Number: hcs500
• Description: Keeloq Code Hopping Decoder
• Manufacturer: Microchip Technology Inc.

HCS500
FIGURE 1-3:
Note: Circled numbers indicate the order of execution.
2.0
DS40153C-page 4
PIN
Note: P = power, I = in, O = out, and ST = Schmitt Trigger input.
1
2
3
4
5
6
7
8
5
PIN ASSIGNMENT
Perform Function
Indicated by
Button Press
button press
Function
Information
Decoder
EE_CLK
EE_DAT
S_DAT
S_CLK
MCLR
RFIN
GND
V
DD
BASIC OPERATION OF RECEIVER (DECODER)
1
2
Received Information
Serial Number
Check for
I/O
I/O
I/O
Match
P
O
P
I
I
I
(1)
Type
Buffer
TTL
TTL
TTL
TTL
TTL
ST
—
—
Synchronization
Encrypted Data
Decrypted
(1)
K
Decryption
Algorithm
32 Bits of
Counter
EE
L
3
Power Connection
Clock to I
Data to I
Master clear input
Synchronous data from controller
Synchronous clock from controller
RF input from receiver
Ground connection
OQ
2
2
C EEPROM
C
™
EEPROM
Manufacturer Code
4
Description
EEPROM Array
Check for
Serial Number
Match
Sync Counter
Crypt Key
2002 Microchip Technology Inc.