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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： | 3/52頁 |
| 文件大小： | 1023K |
| 代理商： | TRF7961RHBT |
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www.ti.com
SLOU186F – AUGUST 2006 – REVISED AUGUST 2010
5
System Description
5.1
Power Supplies
The positive supply pin, VIN (pin 2) has an input voltage range of 2.7 V to 5.5 V. The positive supply input
sources three internal regulators with output voltages VDD_RF, VDD_A and VDD_X that use external bypass
capacitors for supply noise filtering. These regulators provide enhanced PSRR for the RFID reader
system.
The regulators are not independent and have common control bits for output voltage setting. The
regulators can be configured to operate in either automatic or manual mode. The automatic regulator
mode setting ensures an optimal compromise between regulator PSRR and highest possible supply
voltage for RF output power. Whereas, the manual mode allows the user to manually configure the
regulator settings.
VDD_RF
The regulator VDD_RF (pin 3) is used to source the RF output stage. The voltage regulator can
be set for either 5-V or 3-V operation. When configured for the 5-V operation, the output
voltage can be set from 4.3 V to 5 V in 100-mV steps. The current sourcing capability for 5-V
operation is 150 mA maximum over the adjusted output voltage range.
When configured for 3-V operation, the output can be set from 2.7 V to 3.4 V, also in 100-mV
steps. The current sourcing capability for 3-V operation is 100 mA maximum over the adjusted
output voltage range.
VDD_A
Regulator VDD_A (pin 1) supplies voltage to analog circuits within the reader chip. The voltage
setting is divided in two ranges. When configured for 5-V operation, the output voltage is fixed
at 3.5 V.
When configured for 3-V operation, the output can be set from 2.7 V to 3.4 V in 100-mV steps.
Note that when configured, both VDD_A and VDD_X regulators are configured together
(their settings are not independent).
VDD_X
Regulator VDD_X (pin 32) can be used to source the digital I/O of the reader chip together with
other external system components. When configured for 5-V operation, the output voltage is
fixed at 3.4 V.
When configured for 3-V operation, the output voltage can be set from 2.7 to 3.4 V in 100-mV
steps. The total current sourcing capability of the VDD_X regulator is 20 mA maximum over the
adjusted output range. Note that when configured, both VDD_A and VDD_X regulators are
configured together (their settings are not independent).
VDD_PA
The VDD_PA pin (pin 4) is the positive supply pin for the RF output stage and is externally
connected to the regulator output VDD_RF (pin 3).
5.1.1
Negative Supply Connections
The negative supply connections are all externally connected together (to GND). The substrate connection
is VSS (pin 10), the analog negative supply is VSS_A (pin 15), the logic negative supply is VSS_D (pin 29),
the RF output stage negative supply is VSS_TX (pin 6), and the negative supply for the RF receiver input is
VSS_RX (pin 7).
5.1.2
Digital I/O Interface
To allow compatible I/O signal levels, the TRF7960/61 has a separate supply input VDD_I/O (pin 16), with
an input voltage range of 1.8 V to 5.5 V. This pin is used to supply the I/O interface pins (I/O_0 to I/O_7),
IRQ, SYS_CLK, and DATA_CLK pins of the reader. In typical applications, VDD_I/O is connected directly to
VDD_X to ensure that the I/O signal levels of the MCU are the same as the internal logic levels of the
reader.
Copyright 2006–2010, Texas Instruments Incorporated
System Description
11
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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 |
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