TRF7970A RFID与NFC集成收发器技术规格

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"TI-TRF7970A.pdf 是一份关于TI公司TRF7970A的详细数据手册，该芯片是一款13.56MHz RFID和近场通信(NFC)的集成收发器，适用于多种RFID协议处理。" TRF7970A是德州仪器(TI)推出的一款高度集成的13.56MHz RFID和NFC收发器集成电路，设计用于实现多种RFID标准和NFC协议。它支持NFCIP-1(ISO/IEC 18092)和NFCIP-2(ISO/IEC 21481)标准，能够处理ISO/IEC15693、ISO/IEC18000-3、ISO/IEC14443A和B以及FeliCa™等协议。这款芯片的特性包括： 1. 内置编码器、解码器和数据组帧功能，可支持NFC发起方和目标方的运行模式，包括所有三种比特率（106kbps、212kbps、424kbps）以及卡仿真功能。 2. 射频场检测器带有可编程唤醒电平，用于实现NFC无源应答器仿真，并能避免物理碰撞。 3. 集成的状态机实现了ISO/IEC14443A防撞功能，适用于应答器仿真或NFC无源目标。 4. 工作电压范围广泛，为2.7VDC至5.5VDC，输出功率可编程，最高可达+23dBm（200mW）。 5. I/O电压电平可编程，适应1.8VDC至5.5VDC的范围。 6. 可编程系统时钟频率输出，支持13.56MHz、27.12MHz晶振或振荡器产生的RF、RF/2、RF/4频率。 7. 集成的电压稳压器输出，最多可提供20mA电流，以驱动其他系统组件，如微控制器(MCU)、外设和指示器。 8. 可编程调制深度，可根据应用需求进行调整。 9. 包含针对“读”和“写”操作的保护机制，确保数据传输的安全性。此外，TI-TRF7970A还具有良好的电源管理和低功耗特性，使其在各种应用中都能高效工作，例如智能卡、无线支付系统、门禁控制、产品标签、物联网(IoT)设备等。由于其全面的协议支持和灵活的配置选项，开发者可以轻松地构建兼容多种标准的NFC和RFID系统，满足不同应用场景的需求。这款芯片的详细设计和使用说明可以在TI的官方文档SLOS743和ZHCS363L中找到，包括电气特性、封装信息、应用电路图以及推荐的外围元件等。

MUX

RX_IN1

RX_IN2

Phase and

Amplitude

Detector

Gain

RSSI

(AUX)

Logic

Level Shifter

State

Control

Logic

(Control

Registers and

Command

Logic)

127-Byte

FIFO

MCU

Interface

VDD_I/O

I/O_0

I/O_1

I/O_2

I/O_3

I/O_4

I/O_5

I/O_6

I/O_7

IRQ

SYS_CLK

DATA_CLK

ISO

Protocol

Handling

Decoder

RSSI

(External)

Gain

RSSI

(Main)

Filter

and AGC

Digitizer

Bit

Framing

Serial

Conversion

CRC and Parity

Transmitter

Analog Front End

TX_OUT

VDD_PA

VSS_PA

Digital Control

State Machine

Crystal or Oscillator

Timing System

EN2

ASK/OOK

MOD

OSC_IN

OSC_OUT

Voltage Supply Regulator Systems

(Supply Regulators and Reference Voltages)

VSS_A

VSS_RF

VDD_RF

VDD_X

VSS_D

VSS

VIN

VDD_A

BAND_GAP

RF Level

Detector

Phase and

Amplitude

Detector

TRF7970A

www.ti.com.cn

ZHCS363L –AUGUST 2011–REVISED MARCH 2017

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产品主页链接: TRF7970A

6.1.3.3 Card Emulation

The chip can enter this mode by setting appropriate option bits. The chip can emulate ISO/IEC 14443 A

and B card types. For ISO/IEC 14443 A and B, the emulation supports 106-kbps data rate to start. For

ISO/IEC 14443 A, the anticollision algorithm can be performed using an internal state machine, which

relieves the MCU of any real-time tasks; however, this method can present interoperability challenges with

other NFC devices due to timing requirements. To ensure best interoperability, TI recommends allowing

the MCU to manage the anticollision process, instead. The unique ID required for anticollision is provided

by the MCU after wakeup of the system.

6.2 System Block Diagram

图 6-2 shows a block diagram of the TRF7970A.

图图 6-2. System Block Diagram

6.3 Power Supplies

The TRF7970A positive supply input V

(pin 2) sources three internal regulators with output voltages

DD_RF

, V

DD_A

and V

DD_X

. All regulators use external bypass capacitors for supply noise filtering and must

be connected as indicated in reference schematics. These regulators provide a high power supply reject

ratio (PSRR) as required for RFID reader systems. All regulators are supplied by V

(pin 2).

The regulators are not independent and have common control bits in register 0x0B for output voltage

setting. The regulators can be configured to operate in either automatic or manual mode (register 0x0B,

bit 7). The automatic regulator setting mode ensures an optimal compromise between PSRR and the

highest possible supply voltage for RF output (to ensure maximum RF power output). The manual mode

allows the user to manually configure the regulator settings. For applications in which the TRF7970A may

be subjected to external noise, manually reducing the regulator settings can improve RF performance.

TRF7970A

ZHCS363L –AUGUST 2011–REVISED MARCH 2017

www.ti.com.cn

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产品主页链接: TRF7970A

6.3.1 Supply Arrangements

Regulator Supply Input: V

The positive supply at V

(pin 2) has an input voltage range of 2.7 V to 5.5 V. V

provides the supply

input sources for three internal regulators with the output voltages V

DD_RF

, V

DD_A

, and V

DD_X

. External

bypass capacitors for supply noise filtering must be used (per reference schematics).

注注

must be the highest voltage supplied to the TRF7970A.

RF Power Amplifier Regulator: V

DD_RF

The V

DD_RF

(pin 3) regulator is supplying the RF power amplifier. The voltage regulator can be set for

either 5-V or 3-V operation. External bypass capacitors for supply noise filtering must be used (per

reference schematics). When configured for 5-V manual-operation, the V

DD_RF

output voltage can be set

from 4.3 V to 5 V in 100-mV steps. In 3-V manual-operation, the output can be programmed from 2.7 V to

3.4 V in 100-mV steps. The maximum output current capability for 5-V operation is 150 mA and for 3-V

operation is 100 mA.

Analog Supply Regulator: V

DD_A

Regulator V

DD_A

(pin 1) supplies the analog circuits of the device. The output voltage setting depends on

the input voltage and can be set for 5-V and 3-V operation. When configured for 5-V manual-operation,

the output voltage is fixed at 3.4 V. External bypass capacitors for supply noise filtering must be used (per

reference schematics). When configured for 3-V manual-operation, the V

DD_A

output can be set from 2.7 V

to 3.4 V in 100-mV steps (see 表 6-2).

注注

The configuration of V

DD_A

and V

DD_X

regulators are not independent from each other. The

DD_X

output current should not exceed 20 mA.

Digital Supply Regulator: V

DD_X

The digital supply regulator V

DD_X

(pin 32) provides the power for the internal digital building blocks and

can also be used to supply external electronics within the reader system. When configured for 3-V

operation, the output voltage can be set from 2.7 to 3.4 V in 100-mV steps. External bypass capacitors for

supply noise filtering must be used (per reference schematics).

注注

The configuration of the V

DD_A

and V

DD_X

regulators are not independent from each other.

The V

DD_X

output current should not exceed 20 mA.

By default, the regulators are set in automatic regulator setting mode. In this mode, the regulators are

automatically set every time the system is activated by setting EN input High or each time the automatic

regulator setting bit, B7 in register 0x0B is set to a 1. The action is started on the 0 to 1 transition. This

means that, if the user wants to rerun the automatic setting from a state in which the automatic setting bit

is already high, the automatic setting bit (B7 in register 0x0B) should be changed: 1-0-1.

By default, the regulator setting algorithm sets the regulator outputs to a "Delta Voltage" of 400 mV below

, but not higher than 5 V for V

DD_RF

and 3.4 V for V

DD_A

and V

DD_A

TRF7970A

ZHCS363L –AUGUST 2011–REVISED MARCH 2017

www.ti.com.cn

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产品主页链接: TRF7970A

(1) x = Don't care

6.3.2 Supply Regulator Settings

The input supply voltage mode of the reader needs to be selected. This is done in the Chip Status Control

configuration is 5 V, which reflects an operating supply voltage range of 4.3 V to 5.5 V. If the supply

voltage is below 4.3 V, the 3-V configuration should be used.

As V

DD_RF

is increased, the system can become more susceptible to noise coupling on the RX lines. For

minimum noise coupling, TI recommends using the value of 0x00. For improved range, higher V

DD_RF

voltages may be set, but complete system testing is required to determine the value which provides

optimal performance.

The various regulators can be configured to operate in automatic or manual mode. This is done in the

Regulator and I/O Control register (0x0B), as shown in 表 6-1 and 表 6-2.

表表 6-1. Supply Regulator Setting: 5-V System

ADDRESS

(hex)

OPTION BITS SETTING IN REGULATOR CONTROL REGISTER

(1)

COMMENTS

B7 B6 B5 B4 B3 B2 B1 B0

Automatic Mode (default)

0B 1 x x x x x 0 0 Automatic regulator setting 400-mV difference

Manual Mode

0B 0 x x x x 1 1 1 V

DD_RF

= 5 V, V

DD_A

= 3.4 V, V

DD_X

= 3.4 V

0B 0 x x x x 1 1 0 V

DD_RF

= 4.9 V, V

DD_A

= 3.4 V, V

DD_X

= 3.4 V

0B 0 x x x x 1 0 1 V

DD_RF

= 4.8 V, V

DD_A

= 3.4 V, V

DD_X

= 3.4 V

0B 0 x x x x 1 0 0 V

DD_RF

= 4.7 V, V

DD_A

= 3.4 V, V

DD_X

= 3.4 V

0B 0 x x x x 0 1 1 V

DD_RF

= 4.6 V, V

DD_A

= 3.4 V, V

DD_X

= 3.4 V

0B 0 x x x x 0 1 0 V

DD_RF

= 4.5 V, V

DD_A

= 3.4 V, V

DD_X

= 3.4 V

0B 0 x x x x 0 0 1 V

DD_RF

= 4.4 V, V

DD_A

= 3.4 V, V

DD_X

= 3.4 V

0B 0 x x x x 0 0 0 V

DD_RF

= 4.3 V, V

DD_A

= 3.4 V, V

DD_X

= 3.4 V

(1) x = Don't care

表表 6-2. Supply Regulator Setting: 3-V System

ADDRESS

(hex)

OPTION BITS SETTING IN REGULATOR CONTROL REGISTER

(1)

COMMENTS

B7 B6 B5 B4 B3 B2 B1 B0

Automatic Mode (default)

0B 1 x x x x x 0 0 Automatic regulator setting 400-mV difference

Manual Mode

0B 0 x x x x 1 1 1 V

DD_RF

= 3.4 V, V

DD_A

= 3.4 V, V

DD_X

= 3.4 V

0B 0 x x x x 1 1 0 V

DD_RF

= 3.3 V, V

DD_A

= 3.3 V, V

DD_X

= 3.3 V

0B 0 x x x x 1 0 1 V

DD_RF

= 3.2 V, V

DD_A

= 3.2 V, V

DD_X

= 3.2 V

0B 0 x x x x 1 0 0 V

DD_RF

= 3.1 V, V

DD_A

= 3.1 V, V

DD_X

= 3.1 V

0B 0 x x x x 0 1 1 V

DD_RF

= 3.0 V, V

DD_A

= 3.0 V, V

DD_X

= 3.0 V

0B 0 x x x x 0 1 0 V

DD_RF

= 2.9 V, V

DD_A

= 2.9 V, V

DD_X

= 2.9 V

0B 0 x x x x 0 0 1 V

DD_RF

= 2.8 V, V

DD_A

= 2.8 V, V

DD_X

= 2.8 V

0B 0 x x x x 0 0 0 V

DD_RF

= 2.7 V, V

DD_A

= 2.7 V, V

DD_X

= 2.7 V

The regulator configuration function adjusts the regulator outputs by default to 400 mV below V

level, but

not higher than 5 V for V

DD_RF

, 3.4 V for V

DD_A

and V

DD_X

. This ensures the highest possible supply

voltage for the RF output stage while maintaining an adequate PSRR (power supply rejection ratio).

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