參數(shù)資料
型號： HCS473-SLSQTP
廠商： Microchip Technology Inc.
英文描述： Code Hopping Encoder and Transponder
中文描述： 跳碼編碼器和轉(zhuǎn)發(fā)器
文件頁數(shù)： 27/68頁
文件大?。?/td> 1629K
代理商： HCS473-SLSQTP
2002 Microchip Technology Inc.
Preliminary
DS40035C-page 25
HCS473
3.2.3.2
PRESENT TRANSPORT CODE
Prior to modifying the device EEPROM, the correct 32-
bit transport code (password) must be presented to
gain write access. This is done with the PRESENT
TRANSPORT CODE command followed by the 32-bit
transport code and CRC calculated on the 3-bit com-
mand and 32 bits of data.
The HCS473 will return an Acknowledge if the trans-
port code matches the value programmed in produc-
tion; write access has been granted.
The next command (usually a write) must begin T
CMD
after the Acknowledge, Figure 3-13.
The present transport code sequence must precede a
write sequence but not necessarily immediately. Per-
haps all four user memory locations will be written and
verified. The present transport code sequence must
precede only the first write to gain write access. The
system may then alternately write and read (verify)
multiple memory locations. Write access remains until
the next time the device returns to Low Power mode -
communication error or T
CMD
time out without receiving
another command.
FIGURE 3-13:
PRESENT TRANSPORT CODE SEQUENCE (RF RESPONSE EXAMPLE)
T
SF
ACK
CMD
TCODE
T
CMD
‘001
2
’
CRC
2 bits
32 bits
‘
‘
‘
L
Command
M
C
C
CRC
b
b
32-Bit
Transport
b
M
L
ACK
Transport ACK
T
TPACK
b
CMD
ADR
DATA
T
CMD
WRITE Sequence
‘
‘
‘
b
b
b
Address
Command
b
b
16-Bit
Write Data
b
b
T
CMD
Write
Wake Sequence
or
Previous Command
Response
Inductive In
(LC Pins)
RF Response
(DATA Pin)
T
CMD
T
CMD
5 LF
TE
T
CMD
T
FINH
M
L
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HCS473T-I/SL 功能描述:編碼器、解碼器、復(fù)用器和解復(fù)用器 w/ Passive Entry RoHS:否 制造商:Micrel 產(chǎn)品:Multiplexers 邏輯系列:CMOS 位數(shù): 線路數(shù)量（輸入/輸出）:2 / 12 傳播延遲時間:350 ps, 400 ps 電源電壓-最大:2.625 V, 3.6 V 電源電壓-最小:2.375 V, 3 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray
HCS4870C 制造商:Power-One 功能描述:POWER SUPPLY
HCS500 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Memory Programming Specification
HCS500/P 功能描述:編碼器、解碼器、復(fù)用器和解復(fù)用器 3 fnc RoHS:否 制造商:Micrel 產(chǎn)品:Multiplexers 邏輯系列:CMOS 位數(shù): 線路數(shù)量（輸入/輸出）:2 / 12 傳播延遲時間:350 ps, 400 ps 電源電壓-最大:2.625 V, 3.6 V 電源電壓-最小:2.375 V, 3 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray
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