- 您現在的位置：買賣IC網 > PDF目錄98287 > TRF7961RHBT (TEXAS INSTRUMENTS INC) SPECIALTY CONSUMER CIRCUIT, PQCC32 PDF資料下載
參數資料
| 型號： | TRF7961RHBT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQCC32 |
| 封裝： | 5 X 5 MM, GREEN, PLASTIC, QFN-32 |
| 文件頁數： | 29/52頁 |
| 文件大?。?/td> | 1023K |
| 代理商： | TRF7961RHBT |
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頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁當前第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頁第51頁第52頁
www.ti.com
SLOU186F – AUGUST 2006 – REVISED AUGUST 2010
the RF and receivers are switched ON. When this command is received, the reader observes the digitized
receiver output. If more than two edges are observed in 100 ms, the window comparator voltage is
increased. The procedure is repeated until the number of edges (changes of logical state) of the digitized
reception signal is less than 2 (in 100 ms). The command can reduce the input sensitivity in 5-dB
increments up to 15 dB. This command ensures better operation in a noisy environment.
The gain setting is reset to maximum gain at EN = 0, POR = 1.
5.4.9
Test External RF (RSSI at RX input with TX OFF)
This command can be used in active mode when the RF receiver is switched ON, and the RF output is
switched OFF (bit B1=1 in the chip status register, rec-on. See Table 5-9). The level of the RF signal
received on the antenna is measured and displayed in the RSSI levels register. The relation between the
3-bit code and the external RF field strength [A/m] must be determined by calculation or by experiments
for each antenna design. The antenna Q and connection to the RF input influence the result. The nominal
relation between the RF peak-to-peak voltage at the receiver inputs and its corresponding RSSI level is
presented as follows.
Receiver Input [mVPP]
40
60
80
100
140
180
300
RSSI level
1
2
3
4
5
6
7
If the direct command test RF internal or test RF external is used immediately after activation, it should be
preceded with a command enable RX to activate the RX section. For proper execution of the test RF
commands, the RX section must be enabled. This happens automatically when a data exchange between
the reader and the tag is done, or by sending a direct command enable RX.
5.4.10 Test Internal RF (RSSI at RX input with TX ON)
This command measures the level of the RF carrier at the receive inputs. Its operating range is between
300 mVp and 2.1 Vp with a step size of 300 mV. The two values are displayed in the RSSI levels register.
The command is intended for diagnostic purposes to set the correct RX_IN levels. The optimum RX_IN
input level is approximately 1.6 Vp, or an RSSI level of 5 or 6. The nominal relationship between the input
RF peak level and the RSSI code is presented as follows.
Receiver Input [mVPp]
300
600
900
1200
1500
1800
2100
RSSI Level
1
2
3
4
5
6
7
5.4.11 Block Receiver
The block receiver command puts the digital part of receiver (bit decoder and framer) in reset mode. This
is useful in an extremely noisy environment, where the noise level could otherwise cause a constant
switching of the sub-carrier input of the digital part of the receiver. The receiver (if not in reset) would try to
catch a SOF signal, and if the noise pattern matched the SOF pattern, an interrupt would be generated,
falsely signaling the start of an RX operation. A constant flow of interrupt requests can be a problem for
the external system (MCU), so the external system can stop this by putting the receive decoders in reset
mode. The reset mode can be terminated in two ways. The external system can send the enable receiver
command. The reset mode is also automatically terminated at the end of a TX operation. The receiver can
stay in reset after end of TX if the RX wait time register (address 08) is set. In this case, the receiver is
enabled at the end of the wait time following the transmit operation.
5.4.12 Enable Receiver
This command clears the reset mode in the digital part of the receiver if the reset mode was entered by
the block receiver command.
Copyright 2006–2010, Texas Instruments Incorporated
System Description
35
相關PDF資料 |
PDF描述 |
|---|---|
| TS(X)8387MFDSSC/SMD | 1-CH 8-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, CQFP68 |
| TS(X)8387MF_ | 1-CH 8-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, CQFP68 |
| TS(X)8387VF_ | 1-CH 8-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, CQFP68 |
| TS(X)8387VF | 1-CH 8-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, CQFP68 |
| TS8387MFB/C | 1-CH 8-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, CQFP68 |
相關代理商/技術參數 |
參數描述 |
|---|---|
| TRF7961RHBT | 制造商:Texas Instruments 功能描述:RFID Reader IC |
| TRF7961RHBTG4 | 功能描述:RFID應答器 Multi-Standard High Freq RFID Read/Writ RoHS:否 制造商:Murata 存儲容量:512 bit 工作溫度范圍:- 40 C to + 85 C 安裝風格:SMD/SMT 封裝 / 箱體: 封裝:Reel |
| TRF7962A | 制造商:TI 制造商全稱:Texas Instruments 功能描述:FULLY INTEGRATED 13.56-MHz RFID READER/WRITER IC FOR ISO15693/ISO18000-3 STANDARDS |
| TRF7962ARHBR | 功能描述:RFID應答器 Fully Integ 13.56MHz RFID R/W IC RoHS:否 制造商:Murata 存儲容量:512 bit 工作溫度范圍:- 40 C to + 85 C 安裝風格:SMD/SMT 封裝 / 箱體: 封裝:Reel |
| TRF7962ARHBT | 功能描述:RFID應答器 Fully Integ 13.56MHz RFID R/W IC RoHS:否 制造商:Murata 存儲容量:512 bit 工作溫度范圍:- 40 C to + 85 C 安裝風格:SMD/SMT 封裝 / 箱體: 封裝:Reel |
發布緊急采購，3分鐘左右您將得到回復。