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| 型号： | TRF7961RHBR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQCC32 |
| 封装： | 5 X 5 MM, GREEN, PLASTIC, QFN-32 |
| 文件页数： | 5/52页 |
| 文件大小： | 1023K |
| 代理商： | TRF7961RHBR |
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www.ti.com
SLOU186F – AUGUST 2006 – REVISED AUGUST 2010
Table 5-3. Supply-Regulator Setting – Automatic – 5-V System
Byte
Option Bits Setting in Control Register
Action
Address
B7
B6
B5
B4
B3
B2(1)
B1
B0
00
1
5-V system
0B
1
x
1
Automatic regulator setting
250-mV difference
0B
1
x
1
0
Automatic regulator setting
350-mV difference
0B
1
x
0
Automatic regulator setting
400-mV difference
(1)
X are don't cares
Table 5-4. Supply-Regulator Setting – Automatic – 3-V System
Byte
Option Bits Setting in Control Register
Action
Address
B7
B6
B5
B4
B3
B2(1)
B1
B0
00
0
3-V system
0B
1
x
1
Automatic regulator setting
250-mV difference
0B
1
x
1
0
Automatic regulator setting
350-mV difference
0B
1
x
0
Automatic regulator setting
400-mV difference
(1)
X are don't cares
5.1.4
Power Modes
The chip has seven power states, which are controlled by two input pins (EN and EN2) and three bits in
the chip status control register (00h).
The main reader enable input is EN (which has a threshold level of 1 V minimum). Any input signal level
from 1.8 V to VIN can be used. When EN is set high, all of the reader regulators are enabled, together with
the 13.56-MHz oscillator, while the SYS_CLK (output clock for external micro controller) is made available.
The auxiliary-enable input EN2 has two functions. A direct connection from EN2 to VIN ensures availability
of the regulated supply (VDD_X) and an auxiliary clock signal (60 kHz) on the SYS_CLK output (same for
the case EN = 0). This mode is intended for systems in which the MCU controlling the reader is also being
supplied by the reader supply regulator (VDD_X) and the MCU clock is supplied by the SYS_CLK output of
the reader. This allows the MCU supply and clock to be available during power-down.
A second function of the EN2 input is to enable start-up of the reader system from complete power down
(EN = 0, EN2 = 0). In this case the EN input is being controlled by the MCU or other system device that is
without supply voltage during complete power down (thus unable to control the EN input). A rising edge
applied to the EN2 input (which has a 1-V threshold level) starts the reader supply system and 13.56-MHz
oscillator (identical to condition EN = 1). This start-up mode lasts until all of the regulators have settled
and the 13.56-MHz oscillator has stabilized. If the EN input is set high by the MCU (or other system
device), the reader stays active. If the EN input is not set high within 100 ms after the SYS_CLK output is
switched from auxiliary clock (60 kHz) to high-frequency clock (derived from the crystal oscillator), the
reader system returns to complete power-down mode. This option can be used to wake the reader system
from complete power down by using a push-button switch or by sending a single pulse.
Copyright 2006–2010, Texas Instruments Incorporated
System Description
13
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相关代理商/技术参数 |
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| TRF7961RHBRG4 | 功能描述:RFID应答器 Multi-Standard High Frequency RFID RoHS:否 制造商:Murata 存储容量:512 bit 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体: 封装:Reel |
| TRF7961RHBT | 功能描述:RFID应答器 Multi-Standard High Freq RFid Reader RoHS:否 制造商:Murata 存储容量:512 bit 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体: 封装:Reel |
| TRF7961RHBT | 制造商:Texas Instruments 功能描述:RFID Reader IC |
| TRF7961RHBTG4 | 功能描述:RFID应答器 Multi-Standard High Freq RFID Read/Writ RoHS:否 制造商:Murata 存储容量:512 bit 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体: 封装:Reel |
| TRF7962A | 制造商:TI 制造商全称:Texas Instruments 功能描述:FULLY INTEGRATED 13.56-MHz RFID READER/WRITER IC FOR ISO15693/ISO18000-3 STANDARDS |
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