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參數(shù)資料
| 型號(hào)： | MCP450W |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 13.56 MHz Read/Write Passive RFID Device |
| 中文描述： | 13.56 MHz讀/寫無源RFID器件 |
| 文件頁(yè)數(shù)： | 30/50頁(yè) |
| 文件大?。?/td> | 1172K |
| 代理商： | MCP450W |
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MCRF450/451/452/455
DS40232H-page 30
2003 Microchip Technology Inc.
6.2.3.5
Calibration Of Time Reference For
Decoding
The device uses TCP to match its internal decoder
timing to the Interrogator timing. The Interrogator
transmits the timing pulses at the start of all
commands and at least every 17 symbols. The TCP
uses a code violation of the 1-of-16 PPM signal
consisting of three gap pulses within one symbol. The
first gap pulse is located at position 0, the second gap
pulse at position 6 and the third at position 14 of the
symbol. The time period between the last two gap
pulses is used to calibrate the device’s timing for
decoding. Figure 6-10 shows the calibration pulses
for Normal Speed mode. The waveform of the gap
pulses is the same as the 1-of-16 PPM signal, as
shown in Figure 6-2. For Fast Speed mode, the gap
positions are the same. PW
PPM
_
F
is the gap pulse
width and SW
PPM
_
F
is the symbol width of the Fast
mode.
FIGURE 6-10:
CALIBRATION PULSES FOR NORMAK SPEED MODE
6.2.3.6
Calculation Of Matching Code
When the Interrogator receives the FR response from
a device, it sends an MC to select the device. The MC
is sent during the device’s listening window. There are
two different types of matching codes: MC1 and MC2.
Both MC1 and MC2 are used in the detection loop.
MC2 is used in the reactivation loop, as detailed in
Figure 6-1. The MC1 command is used to send the
device to the sleeping loop, while MC2 is used to send
the device to the processing loop.
The MC is an 8-bit “match” of tag ID followed by 4-bit
matching code type and parity bit such that:
Matching code (12 bits) = “match (8 bits of tag
ID)” + matching code type (3 bits)+ parity (1-bit)
The matching code type and parity bit is bit-wise
structured as follows:
MC1:
010
P
MC2:
100
P
where P represents the parity bit of all match bits (8
bits) plus the MC type (3 bits).
The “match” part of the MC is 8 bits of the 32-bit Tag ID.
The Interrogator selects the 8 bits from the 32-bit Tag
ID by calculating the bit range of the Tag ID.
Equation 6-2 shows the equation for selecting the bit
range using the transmission counter (TC). Both the
1
0.5
0
1000
2000
2500
3000
(ms)
Gap Pulse Width
Calibration Time Reference
Position 0
Position 6
Position 14
500
1500
(PW
PPM
_
N
)
Symbol Width
(SW
PPM
_
N
)
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| MCP4531-104E/MS | 制造商:Microchip Technology Inc 功能描述:; LEADED PROCESS COMPATIBLE:YES; PEAK RE |
| MCP4531-502E/MS | 功能描述:數(shù)字電位計(jì) IC Sngl 7B V I2C POT RoHS:否 制造商:Maxim Integrated 電阻:200 Ohms 溫度系數(shù):35 PPM / C 容差:25 % POT 數(shù)量:Dual 每 POT 分接頭:256 弧刷存儲(chǔ)器:Volatile 緩沖刷: 數(shù)字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作電源電壓:1.7 V to 5.5 V 電源電流:27 uA 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFN-16 封裝:Reel |
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