hcs500 Microchip Technology Inc., hcs500 Datasheet - Page 14

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

HCS500
FIGURE 4-9:
FIGURE 4-10: STAND-ALONE MODE LEARN/ERASE-ALL TIMING
FIGURE 4-11: TYPICAL STAND-ALONE APPLICATION CIRCUIT
DS40153C-page 14
Decoder
C DATA
DATA
DATA
CLK
CLK
1
2
3
4
Note:
A
A
A0
A1
A2
V
24LC02B
V
SS
Start Command
CC
T
ERASE ALL
SDA 5
PP
SCL 6
V
WP 7
Because each HCS500 is individually matched to its EEPROM, in-circuit programming is
strongly recommended.
CC
1
B
MCP100-4.5
Power Supply
Supervisor
Vi
8
Learn Activation
B
V
LSB
RST
CC
T
Command Byte
1K
PP
2
1
2
3
4
MSB
V
EECLK
EEDAT
MCLR
DD
HCS500
C
C
SCLK 6
SDAT 5
RFIN 7
LSB
V
22
SS
Subcommand Byte
8
F
Receiver
RF
MSB
Erase-All Activation
Vcc
10K
T
PP
D
3
LSB
LEARN
10K
LED
Dummy Byte
10K
MSB
T
Vcc
ERA
NPN
2002 Microchip Technology Inc.
In-circuit
Programming
Probe Pads (Note)
E
D
Successful
T
Acknowledge
T
ACK
RELAY SPST
PP
4
OUTPUT
E
T
RESP
T
F
ACK
2