HCS500-I Datasheet, PDF (14/34 Pages) Microchip Technology – KEELOQ Code Hopping Decoder

HCS500
FIGURE 4-9: ERASE ALL
TERA
TACK
TRESP
CLK
µC DATA
LSB
MSB
LSB
MSB
LSB
MSB
Decoder
DATA
Start Command
A
B
Command Byte
Subcommand Byte
Dummy Byte
C
D
E
FIGURE 4-10: STAND-ALONE MODE LEARN/ERASE-ALL TIMING
TPP1
TPP2
TPP3
TACK2
Acknowledge
F
TPP4
CLK
DATA
A
Learn Activation
B
C
Erase-All Activation
Successful
D
E
FIGURE 4-11: TYPICAL STAND-ALONE APPLICATION CIRCUIT
VCC
RF
Receiver
1
2
3
4
A0
A1
A2
VSS
VCC
WP
SCL
SDA
8
7
6
5
24LC02B
1K
1
2
3
4
VDD
EECLK
EEDAT
MCLR
VSS
RFIN
SCLK
SDAT
8
7
6
5
HCS500
22 µF
Vcc
LEARN
10K
10K
10K
Vcc
NPN
OUTPUT
RELAY SPST
VCC
Power Supply
Supervisor
Vi
RST
MCP100-4.5
LED
In-circuit
Programming
Probe Pads (Note)
Note: Because each HCS500 is individually matched to its EEPROM, in-circuit programming is
strongly recommended.
DS40153C-page 14
© 2002 Microchip Technology Inc.