STMicroelectronics STEVAL-ISB045V1

Overview

STEVAL-ISB045V1 from STMicroelectronics is a turn-key 2.5 W wireless battery charger transmitter evaluation kit based on the STWBC-WA digital controller, designed for wearable and smart watch applications. It integrates a two-layer PCB layout, resistive/capacitive modulation, foreign object detection (FOD), active presence detection, and full firmware/GUI/dongle support.

For engineers reviewing the STEVAL-ISB045V1 datasheet, STEVAL-ISB045V1 pinout, STEVAL-ISB045V1 application, or STEVAL-ISB045V1 equivalent, this kit enables rapid validation of Qi-compliant 2.5 W transmitter behavior, real-time protocol status monitoring, regulation error analysis, and customizable I²C/UART/GPIO control in compact wearable power systems.

Technical Context

The kit implements a complete Qi v1.2.2 transmitter stack using the STWBC-WA digital controller, which executes closed-loop power regulation via resonant tank voltage (TANK_VOLTAGE), bridge voltage (VBRIDGE), and current sense (ISENSE) feedback. It supports dual-mode modulation-resistive for low-power mode and capacitive for higher efficiency-and performs real-time FOD using CPP_REF and CPP_INT[0–3] inputs.

Control is delivered through UART_TX/RX and I²C_SDA/SCL interfaces, with GPIO_0/GPIO_1 configurable for LED signaling or external event triggering. The board includes an NTC-based coil temperature monitoring path (NTC_TEMP) and uses discrete P/N-MOSFET half-bridge drivers (STL4P2UH7/STL6N3LLH6) for 6.3 µH Würth coil drive at ~125 kHz.

Key Specifications

Availability

STEVAL-ISB045V1 is available at Aetrix Electronics and suitable for wearable device development, smartwatch reference design validation, and Qi-compliant low-power wireless charging system prototyping requiring stable component supply and full-stack firmware visibility.

Supply support for STEVAL-ISB045V1 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, power management, and wireless solutions for industrial, automotive, and consumer markets.

The STEVAL-ISB045V1 belongs to ST's wireless power evaluation platform family, engineered specifically to accelerate development of compact, low-power Qi transmitter systems for wearables and hearables where size, thermal safety, and regulatory compliance are critical.

FAQ

What firmware and GUI tools are included with the STEVAL-ISB045V1?

The kit ships with preloaded firmware supporting LED/GPIO customization and I²C/UART signal tuning. The STSW-STWBCGUI graphical user interface runs on Windows and connects via the included STEVAL-WBCDNGV1 USB-to-UART dongle to display real-time metrics including regulation error, operating frequency, and Qi protocol status.

Does the STEVAL-ISB045V1 support Qi certification testing?

Yes - the board implements full Qi v1.2.2 transmitter functionality, including compliant FOD, active presence detection, and power regulation. While not pre-certified, it meets all mandatory electrical and protocol requirements for Class 0 wearable transmitters and serves as a validated starting point for formal Qi certification testing.

Can the STWBC-WA controller be reprogrammed or updated in-circuit?

Yes - the STWBC-WA supports in-system programming via SWIM interface (pin 27) and firmware updates over UART. The evaluation kit includes SWIM header access and full documentation for custom firmware development using ST's STM32Cube ecosystem and STWBC SDK.

What external components must be added to use the STEVAL-ISB045V1 with a receiver?

No external components are required for basic operation - the board includes the 6.3 µH transmitter coil, MOSFET half-bridge, NTC sensor, and USB-powered 5 V input. To test with a receiver, only a Qi-compliant 2.5 W receiver (e.g., STEVAL-ISB033V1) and appropriate mechanical alignment fixture are needed.