Texas Instruments RI-RFM-007B-00

Overview

RI-RFM-007B from Texas Instruments is a high-performance 134.2 kHz RFID reader frequency module designed for wireless identification of TI-RFid transponders. It integrates analog transmitter and receiver circuitry, supports pulse-width-modulated field strength control (0–50%), delivers up to 20 W peak pulse power, operates with dual isolated supplies (VSP: 7–24 V, VSL: 7–24 V), and enables multi-unit carrier phase synchronization (CPS) in industrial RFID reader systems.

For engineers reviewing the RI-RFM-007B datasheet, RI-RFM-007B pinout, RI-RFM-007B application, or RI-RFM-007B equivalent, key selection considerations include its 134.2 kHz FSK demodulation capability, dual-ground architecture (GND/GNDP), antenna resonance tuning via J3 (14-pin weighted capacitor interface), RXSS- signal strength detection with adjustable threshold, and compliance with FCC/CE regulatory requirements for RFID readers.

Technical Context

The RI-RFM-007B implements a dedicated 134.2 kHz oscillator driving a PWM-controlled transmitter stage, enabling precise field strength adjustment via external resistor on J4. Its receiver uses capacitive coupling from the antenna resonator to detect FSK-modulated return signals (134.2 kHz / 123.2 kHz), synchronized by RXCK clock and decoded via RXDT data output.

It features isolated power domains: VSP/GNDP supplies the high-current transmitter stage (up to 1.7 A peak), while VSL/GND powers logic and receiver circuits (14–22 mA). Carrier Phase Synchronization (CPS) allows one master RFM to coordinate timing across up to five slave units via CPS_IN/CPS_OUT, supporting synchronized multi-antenna deployments without interference.

Key Specifications

Pinout & Package

RI-RFM-007B is a through-hole mounted PCB module measuring 93 mm × 71.1 mm × 44.0 mm (H), weighing ~251 g, with integrated mounting spacers and heatsink interface. It uses standard 2.54 mm pitch connectors: J1 (16-pin), J2 (6-pin), J3 (14-pin), J4 (4-pin), plus ANT1/ANT2 M3 screw terminals.

Key Features

Applications

Availability

RI-RFM-007B is available at Aetrix Electronics and suitable for industrial RFID reader design, animal identification equipment, automated access control systems, and vehicle identification infrastructure requiring stable component supply and long-term lifecycle support.

Supply support for RI-RFM-007B includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor company specializing in analog, embedded processing, and connectivity technologies for industrial, automotive, and communications applications.

The RI-RFM-007B belongs to TI's TI-RFid™ Series 2000 Reader System product line, engineered specifically for high-reliability, low-frequency (134.2 kHz) RFID reader applications requiring field strength control, multi-unit synchronization, and robust EMI immunity in harsh environments.

FAQ

What is the primary function of the RI-RFM-007B in an RFID system?

The RI-RFM-007B serves as the analog frequency module in TI-RFid™ reader systems, responsible for generating the 134.2 kHz energizing field to power passive transponders and demodulating their FSK-encoded response signals. It interfaces directly with the antenna, control module, and power supplies-handling all RF transmission, reception, and signal conditioning functions required for reliable low-frequency RFID operation. The RI-RFM-007B does not perform digital protocol handling or microcontroller functions; those reside in the separate Control Module.

How does the RI-RFM-007B achieve field strength adjustment?

The RI-RFM-007B adjusts transmitted field strength via pulse-width modulation (PWM) of its 134.2 kHz oscillator signal. A resistor connected to J4 Pin 3 sets the pulse width ratio from 0% to 50%, directly scaling the antenna charge-up energy-and thus read range-without altering frequency or hardware components. Decreasing pulse width reduces peak antenna voltage (e.g., from 380 V_peak at 50% to 200 V_peak at ≤25%), enabling optimization for power-limited or EMI-sensitive deployments. This adjustment is implemented entirely within the RI-RFM-007B's analog circuitry.

Why must GND and GNDP be connected externally on the RI-RFM-007B?

GND (logic/receiver ground) and GNDP (transmitter power stage ground) are kept isolated internally on the RI-RFM-007B to prevent high-current return paths from injecting noise into sensitive analog and digital circuits. External bonding-using low-inductance wiring-is mandatory to complete both power loops and avoid latch-up, thermal runaway, or permanent damage. Failure to connect them causes unstable operation, excessive heating, and potential failure of the transmitter stage. This requirement is explicitly enforced in the RI-RFM-007B reference guide and applies regardless of whether the module is used standalone or integrated into a larger assembly.

Can the RI-RFM-007B operate with a switched-mode power supply (SMPS)?

The RI-RFM-007B can operate with an SMPS only if its fundamental switching frequency is ≥200 kHz and output ripple meets Table 3-1 specifications (≤50 mV_rms, 0–50 kHz bandwidth for VSP). Standard 50 kHz SMPS are prohibited because their harmonics interfere with the 134.2 kHz receiver band, degrading FSK demodulation accuracy and read reliability. Linear supplies are preferred; if an SMPS is used, additional LC filtering on both VSP and VSL lines-as detailed in Appendix F of the RI-RFM-007B reference guide-is required to suppress conducted noise before it reaches the RI-RFM-007B inputs.

What is the purpose of the J3 connector on the RI-RFM-007B?

J3 is a 14-pin antenna resonance tuning interface on the RI-RFM-007B that provides weighted binary selection (1–32 steps) of discrete tuning capacitors (ATC1–ATC6) to precisely match the antenna's resonant frequency to 134.2 kHz. Each pin pair connects a specific capacitor value to GNDA, allowing field technicians to calibrate antenna performance without soldering. This interface replaces manual capacitor replacement and enables rapid optimization of field strength and read range across varying antenna geometries, cable lengths, and environmental conditions-critical for achieving consistent performance in production RFID reader assemblies using the RI-RFM-007B.