TRF7961 Fully Integrated 13.56-MHz RFID Reader/Writer IC for ISO15693 - TRF7961


TRF7961 Fully Integrated 13.56-MHz RFID Reader/Writer IC for ISO15693



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- 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 and bit rate as outlined in . 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.


  • Completely Integrated Protocol Handling
  • Separate Internal High-PSRR Power Supplies for Analog, Digital, and PA Sections
    Provide Noise Isolation for Superior Read Range and Reliability
  • Dual Receiver Inputs With AM and PM Demodulation to Minimize Communication 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%)
    • Built-In Receiver Band-Pass Filter With User-Selectable Corner Frequencies
  • Wide Operating Voltage Range of 2.7 V to 5.5 V
  • Ultra-Low-Power Modes
    • Power Down < 1 µA
    • Standby 120 µA
    • 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 Software
    • Source Code Available for MSP430
    • Secure Access Control
    • Product Authentication
      • Printer Ink Cartridges
      • Blood Glucose Monitors
    • Contactless Payment Systems
    • Medical Systems

Tag-it is a trademark of Texas Instruments Incorporated.

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Parametrics Compare all products in NFC / RFID

Operating Temperature Range (C)
Package Group
Package Size: mm2:W x L (PKG)
TRF7961 TRF7960
ISO 15693
ISO 18000-3   
ISO 14443A
ISO 14443B
ISO 15693
ISO 18000-3   
-40 to 110    -40 to 110   
13.56 MHz    13.56 MHz   
32VQFN: 25 mm2: 5 x 5(VQFN)    32VQFN: 25 mm2: 5 x 5(VQFN)