آر اف (فرکانس رادیویی) و بی‌سیم آی‌سی آر‌اف‌آی‌دی و کنترل دسترسی

Product Attributes

Introduction

The TRF7970A is an integrated AFE and multi-protocol data framing device for 13.56 MHz NFC/RFID systems, supporting all three NFC operating modes: Read/Write mode, Peer-to-Peer mode, and Card Emulation mode. It complies with ISO/IEC 14443 A and B, Sony FeliCa, ISO/IEC 15693, NFCIP-1 (ISO/IEC 18092), and NFCIP-2 (ISO/IEC 21481) standards. With built-in programmable options, the device is well-suited for a wide range of NFC, proximity, and vicinity identification applications. The device 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. The TRF7970A handles all framing and synchronization tasks for on-board ISO-compliant protocols, supporting data rates up to 848 kbps. It also supports Read/Write mode for NFC Forum Tag Types 1, 2, 3, 4, and 5. Additional standards or even custom protocols can be implemented using one of the direct modes provided by the device. These direct modes give users full control over the AFE, with access to raw subcarrier data or unframed but ISO-formatted data along with the associated (extracted) clock signal. The receiver system features a dual-input receiver architecture for maximum communication reliability. It also includes multiple automatic and manual gain control options. Signal strength received from transponders, ambient sources, or internal levels is available in the RSSI register. MCU-to-TRF7970A communication can be performed via SPI or parallel interface. When using the built-in hardware encoder and decoder, transmit and receive functions utilize a 127-byte FIFO register. For direct transmit or receive operations, the encoder or decoder can be bypassed, allowing the MCU to process data in real time. The TRF7970A supports a wide supply voltage range of 2.7 V to 5.5 V and 1.8 V to 5.5 V data communication levels for MCU I/O interfaces. When operating at 5 V supply, the transmitter offers selectable output power levels equivalent to 100 mW (+20 dBm) or 200 mW (+23 dBm) into a 50 Ω load, with support for OOK and ASK modulation with selectable modulation depth. The auxiliary regulator supplies up to 20 mA for the MCU and other external circuits in the reader system. With an integrated RF field detector featuring programmable wake-up levels, eight selectable power modes, and ultra-low-power operating modes, designers can easily develop reliable, cost-effective designs with extended battery life.

Features

• NFC standard NFCIP-1 (ISO/IEC 18092) and NFCIP-2 (ISO/IEC 21481) support
• Full protocol handling for ISO/IEC 15693, ISO/IEC 18000-3, ISO/IEC 14443 A and B, and FeliCa
• Integrated encoder, decoder, and data framing for NFC initiator mode, active and passive target modes — all three bit rates (106 kbps, 212 kbps, 424 kbps) and card emulation
• NFC passive transponder emulation via RF field detector with programmable wake-up level
• NFC physical collision avoidance via RF field detector
• ISO/IEC 14443 A anti-collision (broken byte) via integrated state machine (transponder emulation or NFC passive target)
• Input voltage range: 2.7 VDC to 5.5 VDC
• Programmable output power: +20 dBm (100 mW), +23 dBm (200 mW)
• Programmable I/O voltage levels from 1.8 VDC to 5.5 VDC
• Programmable system clock frequency output from 13.56 MHz or 27.12 MHz crystal or oscillator (RF, RF/2, RF/4)
• Integrated voltage regulator output for external system components (MCU, peripherals, indicators), 20 mA (max)
• Programmable modulation depth
• Dual receiver architecture with RSSI for "read vulnerability" elimination and in-band noise detection from adjacent reader systems or surrounding environment
• Programmable power modes for ultra-low-power system design (< 1 µA in power-down)
• Parallel or SPI interface (with 127-byte FIFO)
• Temperature range: -40°C to 110°C
• 32-pin QFN package (5 mm × 5 mm)

Applications

• Mobile devices (tablets, phones)
• Secure pairing (Bluetooth, Wi-Fi, other paired wireless networks)
• Public transit or event ticketing
• Passport or POS reader systems
• Short-range wireless communication tasks (firmware upgrades)
• Product identification or authentication
• Medical devices or consumables
• Access control, digital door locks
• Electronic business card sharing