TI公司的TRF7960TB是13.56MHz RFID阅读器系统,集成了模拟前端和数据成帧系统,成帧系统支持ISO14443 和ISO15693协议, 工作电压2.7 V到5.5 V内置的可编程特性是器件非常适合各种接近式RFID系统的应用,以及安全接入控制,产品鉴别,无接触支付系统和医疗系统.本文介绍了TRF7960/61主要特性, 典型应用框图, TRF796x EVM应用电路图(SPI模式)和TRF7960TB HF RFID阅读器模块特性与电路图,材料清单以及MSP430F5438实验板(MSP-EXP430F5438)电路图和材料清单.

The TRF7960/61 is an integrated analog front end and data-framing system for a 13.56-MHz RFID reader system. Built-in programming options make it suitable for a wide range of applications for proximity and vicinity RFID systems.

The reader is configured by selecting the desired protocol in the control registers. Direct access to all control registers allows fine tuning of various reader parameters as needed.A parallel or serial interface can be implemented for communication between the MCU and reader.

Transmit and receive functions use internal encoders and decoders with a 12-byte FIFO register. For direct transmit or receive functions, the encoders / decoders can be bypassed so the MCU can process the data in real time. The transmitter has selectable output power levels of 100 mW (20 dBm) or 200 mW (23 dBm) into a 50-Ω load (5 -V supply) and is capable of ASK or OOK modulation. Integrated voltage regulators ensure power-supply noise rejection for the complete reader system.

Data transmission comprises low-level encoding for ISO15693, modified Miller for ISO14443-A, high-bit-rate systems for ISO14443 and Tag-it coding systems. Included with the data encoding is automatic generation of SOF, EOF, CRC, and / or parity bits.

The receiver system enables AM and PM demodulation using a dual-input architecture. The receiver also includes an automatic gain control option and selectable gain. Also included is a selectable bandwidth to cover a broad range of input sub-carrier signal options. The received signal strength for AM and PM modulation is accessible via the RSSI register. The receiver output is a digitized sub-carrier signal among a selectable protocol. A selected decoder delivers bit stream and a data clock as outputs.

The receiver system also includes a framing system. This system performs CRC and / or parity check, removes the EOF and SOF settings, and organizes the data in bytes. Framed data is then accessible to the MCU via a 12-byte FIFO register and MCU interface. The framing supports ISO14443 and ISO15693 protocols.

The TRF7960/61 supports data communication levels from 1.8 V to 5.5 V for the MCU I/O interface, while also providing a data synchronization clock. An auxiliary 20-mA regulator (pin 32) is available for additional system circuits.

TRF7960/61主要特性:

• Completely Integrated Protocol Handling

• Separate Internal High-PSRR Power Supplies for Analog, Digital, and PA Sections Provide Noise Isolation for Superior Read Range and (5 mm × 5 mm) Reliability

• Dual Receiver Inputs With AM and PM Demodulation to Minimize Communication Software Holes

• Receiver AM and PM RSSI

• Reader-to-Reader Anti-Collision

• High Integration Reduces Total BOM and Board Area

– Single External 13.56-MHz Crystal Oscillator

– MCU-Selectable Clock-Frequency Output of RF, RF/2, or RF/4

– Adjustable 20-mA, High-PSRR LDO for Powering External MCU

• Easy to Use With High Flexibility

– Auto-Configured Default Modes for Each Supported ISO Protocol

– 12 User-Programmable Registers

– Selectable Receiver Gain and AGC

– Programmable Output Power (100 mW or 200 mW)

– Adjustable ASK Modulation Range(8% to 30%)

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• Wide Operating Voltage Range of 2.7 V to 5.5 V

• Ultra-Low-Power Modes

– Power Down < 1 mA

– Standby 120 mA

Active (Rx only) 10 mA

• Parallel 8-Bit or Serial 4-Pin SPI Interface With MCU Using 12-Byte FIFO

• Ultra-Small 32-Pin QFN Package(5 mm × 5 mm)

• Available Tools

Reference Design/EVM With Development

Source Code Available for MSP430

TRF7960/61应用:

• Secure Access Control

• Product Authentication

– Printer Ink Cartridges

– Blood Glucose Monitors

• Contactless Payment Systems

• Medical Systems

图1.TRF7960/61典型应用框图


图2.TRF796x EVM应用电路图(SPI模式)

TRF7960TB HF RFID阅读器模块

TRF7960TB HF RFID Reader Module

This document provides direction for TRF796x users implementing a 13.56-MHz RFID reader solution using the TRF796x IC connected to a Texas Instruments embedded microcontroller or microprocessor development platform. Examples of such development platforms are the MSP-EXP430F5438 board, the ARM® Cortex™-M3 based DK-LM3S9B96 board, MAVRK™ Reference Kit, or any other TI embedded microcontroller platform with the EM socket headers populated.


图3.TRF7960TB 评估模块外形图


图4.TRF7960TB 评估模块电路图

MSP430F5438实验板(MSP-EXP430F5438)

The MSP430F5438 Experimenter Board (MSP-EXP430F5438) is a development platform for the latest generation MSP430 MCUs. It features a 100-pin socket which supports the MSP430F5438 and other devices with similar pinouts. The socket allows for quick upgrades to newer devices or quick applications changes. It is also compatible with many TI low-power RF wireless evaluation modules such as the CC2520EMK and the TRF7960TB module discussed here in this document.

The Experimenter Board helps designers quickly learn and develop using the new F5xx MCUs, which provide the industry’s lowest active power consumption, more memory and leading integration for applications such as energy harvesting, wireless sensing and automatic metering infrastructure (AMI).

图5.MSP430F5438实验板外形图

图6.MSP430F5438实验板电路图: MSP430F5438A和外设电路

图7.MSP430F5438实验板电路图:USB到UART电路

图8.MSP430F5438实验板(MSP-EXP430F5438)开发平台

详情请见:
http://focus.ti.com/lit/ug/slou297/slou297.pdf
和
http://focus.ti.com/lit/ug/slau263f/slau263f.pdf