STMicroelectronics STEVAL-ISB042V1

Overview

STEVAL-ISB042V1 from STMicroelectronics is a dual-mode wireless power evaluation board supporting Qi 1.2 (up to 15 W/10 V) and AirFuel inductive (PMA-SR1, up to 5 W/5.6 V) receiver operation, plus Qi-based transmitter functionality (up to 3 W) using the same coil - enabling bidirectional evaluation of STWLC33-based wireless charging systems for wearables and mobile accessories.

For engineers reviewing the STEVAL-ISB042V1 datasheet, STEVAL-ISB042V1 pinout, STEVAL-ISB042V1 application, or STEVAL-ISB042V1 equivalent, this board provides validated hardware, firmware, and I²C-configurable GPIOs to accelerate development of certified Qi/AirFuel receiver-transmitter hybrid designs with foreign object detection and >80% system efficiency.

Technical Context

The board implements the STWLC33 wireless power receiver IC with integrated synchronous rectifier, FOD algorithm, and programmable voltage/current regulation loop - operating across two distinct modes: high-efficiency inductive reception (Qi extended profile & PMA-SR1) and reverse-power transmission via the same coil topology. It integrates an STM32F103T8 microcontroller for host communication, firmware updates, and GPIO status management.

Power path architecture includes dual-stage rectification (AC1/AC2 inputs), configurable LDO outputs (V18, VLDO), and dedicated analog front-end filtering (CFLT1–CFLT3, RFLT1–RFLT3) for precise voltage ripple suppression and thermal-aware coil current sensing - all implemented on a cost-optimized 4-layer PCB layout.

Key Specifications

Availability

STEVAL-ISB042V1 is available at Aetrix Electronics and suitable for wireless charging development, Qi certification pre-validation, and AirFuel interoperability testing requiring stable component supply and production-ready reference design fidelity.

Supply support for STEVAL-ISB042V1 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 headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, analog ICs, power management devices, and wireless solutions for industrial, automotive, and consumer applications.

This evaluation board belongs to ST's Wireless Charging Solutions product line, engineered specifically to accelerate time-to-certification for dual-standard (Qi + AirFuel) wireless power receivers and enable rapid prototyping of transmitter-receiver co-location architectures in space-constrained wearable and portable electronics.

FAQ

Does STEVAL-ISB042V1 support both receiver and transmitter functions simultaneously?

No. The board operates in either Qi/AirFuel receiver mode or Qi-based transmitter mode - selected via firmware configuration. Simultaneous dual-direction power transfer is not supported due to STWLC33's time-multiplexed architecture and shared coil driver stage, which prevents concurrent Rx/Tx operation per WPC and AirFuel specifications.

What coil is used on the STEVAL-ISB042V1 board?

The board uses the Würth Elektronik dual-mode coil model 760308102207 - a single planar inductor optimized for both Qi and AirFuel inductive coupling, mounted on a 1.5 mm thick plastic fixture to maintain mechanical stability and magnetic field uniformity during alignment testing.

Is firmware source code provided with the evaluation kit?

Yes. ST provides complete firmware binaries and source code (in C) for the onboard STM32F103T8 microcontroller, including I²C command handlers, GPIO control logic, FOD calibration routines, and Qi packet parsing modules - accessible via ST's official website under the STEVAL-ISB042V1 product page resources section.

Can the board be used for Qi certification testing?

Yes. STEVAL-ISB042V1 is built around STWLC33 silicon certified to Qi v1.2 Extended Power Profile and AirFuel SR1 standards. While it serves as a pre-certified reference platform, formal Qi certification requires submission through a WPC-authorized test lab using the final end-product mechanical and electrical integration - not the evaluation board alone.