参数资料
型号: HCS473PSQTP
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: 24/68页
文件大小: 1629K
代理商: HCS473PSQTP
HCS473
DS40035C-page 22
Preliminary
2002 Microchip Technology Inc.
3.2.2.4
Command Sequence
The transponder reader follows the HCS473’s Field
Acknowledge by sending the desired 3-bit command,
3-bit option or address, associated data and CRC;
each as required. LF commands are Pulse Position
Modulated (PPM) as shown in Figure 3-10. The last bit
(CRC bit) should be followed by leaving the field on for
T
FINH
.
T
FINH
should be appropriately adjusted to receive con-
secutive
commands
or
Section 3.2.4 and Section 3.2.5 for LF response and
consecutive command considerations.
LF
responses.
See
FIGURE 3-11:
HCS473 TRANSPONDER WAKE-UP SEQUENCE
Communication from reader to HCS473
Communication from HCS473 to reader
SKIPACK = 1 - Field Acknowledge is not sent
Inductive
(LC)
T
SF
Command
T
CMD
T
SF
MAX
SKIPACK = 0 - Field Acknowledge sent when device wakes
Inductive
(LC)
RF
Response
(DATA)
125kHz Field
(on LC pins)
T
CMD
b
b
b
Command
b
b
b
T
CMD
3LF
TE
3LF
TE
3LF
TE
Simultaneous LF
Acknowledge
(LFRSP=1)
RF Acknowledge
(RFRSP=1)
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