STMicroelectronics STEVAL-ISB008V1

Overview

STEVAL-ISB008V1 from STMicroelectronics is a standalone USB/DC-powered Li-ion battery charger demonstration board built around the STw4102 charger IC and STM32F103C6 microcontroller. It delivers up to 400 mA from USB or 800 mA from DC adapter, integrates a 5-LED gas gauge for real-time capacity monitoring (configurable 1200–2100 mAh), and uses I²C for MCU-to-charger communication.

For engineers reviewing the STEVAL-ISB008V1 datasheet, STEVAL-ISB008V1 pinout, STEVAL-ISB008V1 application, or STEVAL-ISB008V1 equivalent, this board serves as a validated reference for embedded portable power management, USB-compliant charging firmware integration, and analog/digital co-design of battery status feedback systems.

Technical Context

The board implements a dual-source charging architecture: USB VBUS (5 V ±5%) and external DC input (5–12 V) feed the STw4102, which regulates charge current and voltage with thermal foldback. The STM32F103C6 executes preloaded firmware that reads STw4102 registers via I²C, computes state-of-charge, and drives five discrete LEDs for capacity level indication plus two dual-color LEDs for charge/discharge/fault status.

Firmware supports user-adjustable full-scale battery capacity (1200, 1500, 1800, or 2100 mAh) in 300 mAh steps, enabling calibration across different cell chemistries and form factors without hardware modification. All control logic, USB enumeration, and LED sequencing are handled on-board-no host PC or external controller required.

Key Specifications

Availability

STEVAL-ISB008V1 is available at Aetrix Electronics and suitable for portable medical monitors, handheld test equipment, and rechargeable IoT edge nodes requiring stable component supply and proven USB battery charging reference design.

Supply support for STEVAL-ISB008V1 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, power management ICs, sensors, and analog devices for industrial, automotive, and consumer applications.

This evaluation board belongs to ST's STEVAL (ST Evaluation) series, developed specifically to accelerate prototyping and validation of battery management subsystems using ST's integrated analog+MCU solutions.

FAQ

Does STEVAL-ISB008V1 support USB Battery Charging (BC) 1.2 specification?

No. The board uses standard USB 2.0 upstream port detection (VBUS presence only) and does not implement BC 1.2 D+/D− handshake or dedicated charging port (DCP) identification. Charging current is fixed per input source-not negotiated via USB protocol.

Can the firmware be reprogrammed or modified?

Yes. The STM32F103C6 is accessible via SWD interface using ST-LINK/V2 or compatible debuggers. ST provides the original firmware source code and application note AN3123, enabling full customization of gas gauge algorithm, LED behavior, and charge termination criteria.

What battery chemistry is supported?

The STw4102 is configured for single-cell Li-ion/Li-polymer batteries with 4.2 V nominal termination voltage. It does not support LiFePO₄, NiMH, or lead-acid chemistries due to fixed charge profile and voltage thresholds.

Is external power required to operate the gas gauge when USB is disconnected?

Yes. The gas gauge function relies on continuous power to the STM32F103C6 and STw4102. When both USB and DC inputs are removed, the board powers down completely-no battery-backed operation or coulomb counting in sleep mode is implemented.