STMicroelectronics EFL1-NFC-PMB

Overview

EFL1-NFC-PMB from STMicroelectronics is a power management board integrating the EnFilm™ EFL700A39 solid-state thin-film battery, ST M24LR04E-R dynamic NFC/RFID tag IC, and an ultra-low-current power management IC for charge control and deep discharge protection. It measures 38.0 × 36.0 mm, supports contactless 25 mW NFC charging, and enables direct connection to energy-constrained IoT sensor nodes.

For engineers reviewing the EFL1-NFC-PMB datasheet, EFL1-NFC-PMB pinout, EFL1-NFC-PMB application, or EFL1-NFC-PMB equivalent, this board serves as a reference design for NFC-powered autonomous sensors, batteryless wake-up systems, and ultra-low-power wireless monitoring platforms requiring integrated energy harvesting interface and NFC-based configuration.

Technical Context

The board implements a dual-input power architecture: primary NFC wireless power harvesting via the M24LR04E-R (ISO15693-compliant, 13.56 MHz, 25 mW max delivered), and secondary wired input for external sources such as energy harvesters or DC supplies. The embedded power management IC regulates charging current to the EFL700A39 with <1 µA quiescent current and enforces deep discharge cutoff at 1.8 V.

It provides direct access to the M24LR04E-R's I²C interface and RF memory bank, enabling bidirectional NFC communication for firmware updates, sensor data readout, and battery state reporting without host MCU intervention.

Key Specifications

Availability

EFL1-NFC-PMB is available at Aetrix Electronics and suitable for NFC-powered environmental sensors, predictive maintenance vibration monitors, and contactless-configurable smart tags requiring stable component supply and long-term lifecycle support.

Supply support for EFL1-NFC-PMB 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

STMicroelectronics is a global semiconductor leader specializing in microcontrollers, analog ICs, MEMS, and power management solutions for industrial, automotive, and IoT applications.

This board belongs to ST's EnFilm™ ecosystem product line, designed to accelerate development of maintenance-free, battery-integrated wireless sensing nodes powered by ambient RF or harvested energy.

FAQ

What interfaces does the EFL1-NFC-PMB expose for host system integration?

The board provides a standard 0.1″ pitch 10-pin header with I²C (SCL/SDA), VCC, GND, NFC antenna connection points, and dedicated pins for external power input and battery voltage monitoring. No UART or SPI is exposed - all communication occurs via the M24LR04E-R's ISO15693 RF interface or its I²C slave port.

Can the EFL1-NFC-PMB be used without NFC infrastructure?

Yes. The board accepts wired DC input on its auxiliary power pin, allowing operation with energy harvesters (e.g., solar, thermal, or piezoelectric) or regulated 3.0–4.2 V supplies. NFC is optional for charging and configuration; the EFL700A39 can be charged and monitored entirely through wired paths.

Does the EFL1-NFC-PMB include protection against overvoltage or reverse polarity?

No. The board lacks reverse-polarity or overvoltage protection circuitry on its external power input. Users must ensure applied DC voltage remains within 3.0–4.2 V and observe correct polarity. The internal power management IC only handles battery-side protection (deep discharge, charge termination).

Is the EFL700A39 battery replaceable on the EFL1-NFC-PMB?

No. The EFL700A39 is surface-mounted and soldered directly to the board with no socket or replacement interface. ST specifies it for >10,000 charge cycles and 10-year calendar life under typical use, eliminating need for field replacement in intended applications.