- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄383589 > MCRF452 (Microchip Technology Inc.) 13.56 MHz Read/Write Passive RFID Device PDF資料下載
參數(shù)資料
| 型號： | MCRF452 |
| 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 |
| 文件頁數(shù)： | 22/50頁 |
| 文件大小： | 1172K |
| 代理商： | MCRF452 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁當前第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁
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 |
|---|---|
| MCRF455 | 13.56 MHz Read/Write Passive RFID Device |
| MCP450P | 400000 SYSTEM GATE 1.8 VOLT FPGA - NOT RECOMMENDED for NEW DESIGN |
| MCP450S | 13.56 MHz Read/Write Passive RFID Device |
| MCP450SB | 13.56 MHz Read/Write Passive RFID Device |
| MCP450SN | 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 |
|---|---|
| MCRF455 | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:13.56 MHz Read/Write Passive RFID Device |
| MCRFG0201 | 制造商:SPC Multicomp 功能描述:MODULAR COUPLER IN-LINE CAT5E 制造商:SPC Multicomp 功能描述:MODULAR, COUPLER, IN-LINE, CAT5E 制造商:SPC Multicomp 功能描述:MODULAR, COUPLER, IN-LINE, CAT5E; Connector Type:In-Line Adapter; Convert From Connector:RJ45; Convert From Gender:Jack; Convert From Positions:8; Convert To Connector:RJ45; Convert To Gender:Jack; Convert To Positions:8; SVHC:No ;RoHS Compliant: Yes |
| MCR-FL-C-UI-2UI-DCI | 制造商:Phoenix Contact 功能描述:ANALOG CONVERTER MCR-FL |
| MCR-FL-C-UI-2UI-DCI-NC | 制造商:Phoenix Contact 功能描述:INTERFACE ANALOG 制造商:Phoenix Contact 功能描述:SIGNAL MULTIPLIER, CURRENT/VOLTAGE, 30V, DIN RAIL, Signal Conditioner Output:Current / Voltage, No. of Output Channels:2, Supply Voltage Min:20VDC, Supply Voltage Max:30VDC, Supply Voltage Range:20VDC to 30VDC , RoHS Compliant: Yes |
| MCR-FL-C-UI-UI-DCI-24/230 | 制造商:Phoenix Contact 功能描述:INTERFACE ANALOG ((NS)) 制造商:Phoenix Contact 功能描述:Configurable 3-way isol amplifier,0-20mA |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。