hcs473 Microchip Technology Inc., hcs473 Datasheet - Page 36

• Manufacturer Part Number: hcs473
• Description: Code Hopping Encoder And Transponder
• Manufacturer: Microchip Technology Inc.

HCS473
FIGURE 3-23:
DS40035C-page 34
Wake-up Sequence
Transponder Select Sequence
ACK Response Sequences Concluding with CRC
Data Response Sequences Concluding with CRC
- Present Transport Code
- Write
- Anticollision Off
- IFF
- Read
- Request Hopping Code
ASK
FSK
ASK
FSK
ASK
FSK
ASK
FSK
Inductive In (LC)
Inductive In (LC)
Inductive In (LC)
Inductive In (LC)
PLL (RFEN)
PLL (RFEN)
PLL (RFEN)
PLL (RFEN)
PLL (RFEN)
PLL (RFEN)
PLL (RFEN)
PLL (RFEN)
RF (DATA)
RF (DATA)
RF (DATA)
RF (DATA)
RF (DATA)
RF (DATA)
RF (DATA)
RF (DATA)
RFEN BEHAVIOR DURING LF COMMUNICATION
CRC
CRC
12-Bit VID
1 LF
T
SF
TE
Response
Response
Time
Time
Preliminary
TID=0
TID=1 TID=2 TID=3
1 LF
TE
1 LF
T
TE
CMD
Command
Command
1 LF
T
CMD
TE
Command
Next
 2002 Microchip Technology Inc.
Command