HCS515-I Datasheet, PDF (4/32 Pages) Microchip Technology – KEELOQ Code Hopping Decoder

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.