HCS473 Datasheet, PDF (36/68 Pages) Microchip Technology – Code Hopping Encoder and Transponder

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