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| 型号： | HCS473SLQTP |
| 厂商： | Microchip Technology Inc. |
| 英文描述： | Code Hopping Encoder and Transponder |
| 中文描述： | 跳码编码器和转发器 |
| 文件页数： | 26/68页 |
| 文件大小： | 1629K |
| 代理商： | HCS473SLQTP |
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HCS473
DS40035C-page 24
Preliminary
2002 Microchip Technology Inc.
3.2.3.1
SELECT TRANSPONDER
The SELECT TRANSPONDER sequence must imme-
diately follow the HCS473 wake-up. A 12-bit Vehicle ID
(VID) follows the 3-bit command. The 4-bit Token ID
(TID) is sent by pulsing the field to identify which tran-
sponder should respond.
The HCS473 counts each time the field is pulsed (6
LF
TE
period), the first pulse setting the counter equal to
0. If the VID matched, the HCS473 will send an
Acknowledge when the TID matches the counter. Any
further TID pulses after the Acknowledge occurs will
deselect the device, putting it back to SLEEP - again
requires a wake-up sequence to communicate.
Any HCS473 that did not match both the presented VID
and TID will return to SLEEP, unselected, remaining
that way until the next wake-up pulse occurs.
The next command must begin T
TSCMD
after the
Acknowledge. If the LC input is high a point T
TSCMD
MIN
after the Acknowledge ends, the HCS473 will return to
SLEEP, unselected, assuming the transponder reader
is sending additional TID pulse(s) to select a different
device. A device of any TID value may therefore be
uniquely selected, regardless if a device with lower TID
has already acknowledged.
FIGURE 3-12:
TRANSPONDER SELECT SEQUENCE (RF RESPONSE EXAMPLE)
T
SF
ACK
CMD
VID
T
CMD
‘000
2
’
TID
T
TSCMD
12 bits
‘
‘
‘
L
Command
M
TID=0
b
b
12-Bit
VID
b
M
L
ACK
Transponder Select ACK
b
1-16
Pulses
CMD
‘XXX’
TID=1
TID=2
TID=3
5 LF
TE
6 LF
TE
b
b
b
T
TSCMD
Next
Command
Example for TID=’0011’
T
TSACK
WAKE ACK
Inductive In
(LC Pins)
RF Response
(DATA Pin)
T
CMD
T
CMD
16-bit Device Identifier = [ 12-bit Vehicle ID ] [ 4-bit Token ID ]
b
b
b
b
b
b
b
b
b
b
b
M
b
b
b
b
b
L
b
b
b
b
b
b
b
b
b
b
b
M
b
L
b
M
b
b
b
L
DID
TID
VID
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相关代理商/技术参数 |
参数描述 |
|---|---|
| HCS473-SLQTP | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Code Hopping Encoder and Transponder |
| HCS473SLROM | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Code Hopping Encoder and Transponder |
| HCS473-SLROM | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Code Hopping Encoder and Transponder |
| HCS473SLSQTP | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Code Hopping Encoder and Transponder |
| HCS473-SLSQTP | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Code Hopping Encoder and Transponder |
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