HCS473T-I/SN Microchip Technology, HCS473T-I/SN Datasheet - Page 33

• Manufacturer Part Number: HCS473T-I/SN
• Description: IC KEELOQ 3AXIS TRANSCODER 8SOIC
• Manufacturer: Microchip Technology
• Series: KEELOQ®r
• Type: Code Hopping Encoder and Transponderr

Specifications of HCS473T-I/SN

• Applications: Access Control Systems
• Mounting Type: Surface Mount
• Package / Case: *
• Lead Free Status / RoHS Status: Request inventory verification / Request inventory verification

Table 7-5 timing values are compensated only for
HCS473 internal filter delays. The transponder reader
designer must compensate communication timing
accordingly for the cumulative antenna delays.
Use LF Demodulator mode to see the effects of the
internal filters and the LC antennae, Section 3.2.1.2.
FIGURE 3-19:
 2002 Microchip Technology Inc.
Transponder Select Sequence
Anticollision Off Sequence
Present Transport Code Sequence
Write Sequence
RF Response
RF Response
RF Response
(LC Pins)
(DATA Pin)
Inductive
(LC Pins)
(DATA Pin)
Inductive
(LC Pins)
(DATA Pin)
RF Response
Inductive
(LC Pins)
(DATA Pin)
Inductive
Command
Command
LF ACK RESPONSE ADJUSTMENTS (LFRSP=1)
T
Command
CMD
Command
T
CMD
T
T
CMD
CMD
Transport
32-Bit
Address
12-Bit
T
VID
AOACK
CRC
ACOL Off ACK
T
5 LF
CRC
TPACK
T
Write Data
TID=0
6 LF
FINH
Simultaneous
16-Bit
TE
Transport ACK
LF ACK
TE
5 LF
Preliminary
T
TID=1 TID=2
T
CMD
FINH
Simultaneous
TE
LF ACK
CRC
Command
T
Next
T
Transponder Select ACK
CMD
CMD
It must be clearly understood that the HCS473 core
does not see the LF field immediately upon the base
station turning it on, nor does it immediately detect its
removal. If the internal analog delay and cumulative
antenna delays are greater than a given low time, the
HCS473 will obviously never “see” the low.
Command
5 LF
Simultaneous
Next
T
CMD
LF ACK
T
TE
TSACK
T
WRT
T
TSCMD
Command
Next
Write ACK
5 LF
T
Simultaneous
FINH
TE
LF ACK
T
CMD
HCS473
Command
DS40035C-page 31
Next
T
CMD