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參數(shù)資料
| 型號： | MCP451WB |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 400000 SYSTEM GATE 1.8 VOLT FPGA - NOT RECOMMENDED for NEW DESIGN |
| 中文描述： | 13.56 MHz讀/寫無源RFID器件 |
| 文件頁數(shù)： | 22/50頁 |
| 文件大小： | 1172K |
| 代理商： | MCP451WB |
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MCRF450/451/452/455
DS40232H-page 22
2003 Microchip Technology Inc.
6.2.3
DETECTION OF INTERROGATOR
COMMANDS
The Interrogator sends commands to the device by
amplitude modulating the carrier signal (gap pulse).
The Interrogator uses two classes of encoding signals
for modulation. They are (1) 1-of-16 PPM for data
transmission, and (2) specially timed gap pulse
sequence for the FRR and FRB commands. These
commands consist of five gap pulses within nine possi-
ble gap pulse positions (1.575 ms). The combination of
the possible gap positions determines the command
type and parameters of the Fast Read command.
The Interrogator also sends TCP prior to the 1-of-
16 PPM. The TCP is used to calibrate the time-base of
the decoder in the device. The specifics of the two
encoding methods and the TCP are described in the
following sections.
6.2.3.1
Fast Read (FR) Commands
The FR commands are composed of five 175
μ
s wide
gap pulses (see Figure 6-2) whose spacing within
1.575 ms determines the command type and its param-
eters. Table 6-4 shows the specification of the gap
signal for the FR commands. Two commands are used
for the fast read. They are: (1) Fast Read Request
(FRR) in the Detection loop, and (2) Fast Read Bypass
(FRB) in the Reactivation loop. See Tables 6-5 and 6-6
for the FRR gap pulse positions. See Figures 6-3 to 6-8
for the gap modulation patterns.
The parameters of FRR are: (1) number of time slots
(TSMAX = 1,16, or 64), (2) maximum transmission
counter (TCMAX) and (3) data transmission speed.
The FRB has only a data transmission speed parame-
ter (Normal or Fast Speed mode). The device extracts
these parameters based on the positions of the five gap
pulses within the 1.575 ms time span, as shown in
Figures 6-3 to 6-8.
TSMAX = 1 is given if there is only one device in the
field. This is called “Conveyor mode” or “single tag
environment”. In this mode, the device responds with
the FR response signal in every time slot until it
receives a correct matching code, or until TCMAX is
elapsed.
6.2.3.2
Data Transmission Speed
The Interrogator can send data with two different data
rates: (1) Normal and (2) Fast Speed modes. The
normal speed uses 2.8 ms/symbol, while the fast
speed uses 160
μ
s/symbol. One symbol represents
one 4-bit data packet (see
Section 6.2.3.4 “1-of-16
PPM”
). The data transmission speed is a parameter of
the FRR and FRB commands. This parameter
indicates the data speed of subsequent Interrogator
commands. The data rate of the device output (70 kHz)
is not affected by this parameter.
TABLE 6-4:
SPECIFICATION OF GAP SIGNAL FOR FRR AND FRB COMMANDS
Number of gaps for one command
5
Total available number of gap positions within the command time span
9
Command time span
1.575 ms
Gap pulse width
175
μ
s
相關(guān)PDF資料 |
PDF描述 |
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| MCP451WF | 400000 SYSTEM GATE 1.8 VOLT FPGA - NOT RECOMMENDED for NEW DESIGN |
| MCP451X | 400000 SYSTEM GATE 1.8 VOLT FPGA - NOT RECOMMENDED for NEW DESIGN |
| MCP452 | 13.56 MHz Read/Write Passive RFID Device |
| MCP452P | 13.56 MHz Read/Write Passive RFID Device |
| MCP452S | 13.56 MHz Read/Write Passive RFID Device |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MCP4531-103E/MS | 功能描述:數(shù)字電位計 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 |
| MCP4531-103E/MS | 制造商:Microchip Technology Inc 功能描述:Digital Potentiometer IC |
| MCP4531-104E/MS | 功能描述:數(shù)字電位計 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 |
| 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 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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