hcs512 Microchip Technology Inc., hcs512 Datasheet - Page 4

• Manufacturer Part Number: hcs512
• Description: Keeloq Code Hopping Decoder Keeloq Code Hopping Decoder
• Manufacturer: Microchip Technology Inc.

HCS512
FIGURE 1-3:
NOTE: Circled numbers indicate the order of execution.
2.0
DS40151D-page 4
Note 1: P = power, I = in, O = out, and ST = Schmitt Trigger input.
PIN
10
12
13
14
15
16
17
18
11
1
2
3
4
5
6
7
8
9
2: Pin 12 and Pin 13 have a dual purpose. After RESET, these pins are used to determine if Programming
5
PIN ASSIGNMENT
OSC
Perform Function
OSC
mode is selected in which case they are the clock and data lines. In normal operation, they are the clock
and data lines of the synchronous data output stream.
Indicated by
Button Press
button press
Function
LRNOUT
Information
Decoder
Ground
SLEEP
LRNIN
OUT
MCLR
DATA
RFIN
IN
V
CLK
V
NC
NC
S0
S1
S2
S3
LOW
DD
(4MHz)
(1MH
BASIC OPERATION OF RECEIVER (DECODER)
Z
)
1
2
Received Information
Serial Number
Check for
I/O
I/O
I/O
Match
—
—
O
P
O
O
O
O
O
P
O
I
I
I
I
I
(1)
TTL/ST
TTL/ST
Type
Buffer
TTL
TTL
TTL
TTL
TTL
TTL
TTL
TTL
TTL
TTL
TTL
ST
ST
—
—
—
Synchronization
Encrypted Data
Decrypted
(1)
K
Decryption
Algorithm
32 Bits of
(2)
(2)
Counter
EE
L
3
OQ
Learn input - initiates learning, 10K pull-up required on input
Oscillator in – recommended values 4.7 k
Clock in Programming mode and Synchronous mode
Data in Programming mode and Synchronous mode
Connect to RFIN to allow wake-up from SLEEP
Learn output - indicates learning
Battery low indication output
Oscillator out (test point)
RF input from receiver
Ground connection
Master clear input
Power connection
Do not connect
Manufacturer Code
4
Description
EEPROM Array
Check for
Serial Number
Switch 0
Switch 1
Switch 2
Switch 3
Match
Sync Counter
Crypt Key
2002 Microchip Technology Inc.
and 22 pF