STMicroelectronics STEVAL-ISB012V1

Overview

STEVAL-ISB012V1 from STMicroelectronics is a battery monitoring system demonstration board built around the STC3105 Coulomb counter IC for single-cell Li-ion batteries. It measures voltage, current, and capacity up to ±10950 mAh, displays real-time SOC and charge/discharge status on LCD and LEDs, and transmits data to PC via USB virtual COM port using HyperTerminal or custom GUI.

For engineers reviewing the STEVAL-ISB012V1 datasheet, STEVAL-ISB012V1 pinout, STEVAL-ISB012V1 application, or STEVAL-ISB012V1 equivalent, this board serves as a validated reference for gas-gauge firmware integration, USB-based battery telemetry, low-voltage/SOC alarm implementation, and embedded power management validation in portable electronics.

Technical Context

The board implements the STC3105's integrated analog front-end for precision voltage and current sensing, coupled with its on-chip coulomb counting algorithm to compute state-of-charge without requiring battery model characterization. It supports real-time bidirectional current measurement and internal battery charging control.

Power is supplied either via USB (5 V) or external DC adapter, enabling standalone operation. The onboard LCD and dual-color LED indicators provide immediate visual feedback of battery polarity, low-voltage condition, and SOC thresholds - all driven directly by STC3105 status registers and firmware logic.

Key Specifications

Availability

STEVAL-ISB012V1 is available at Aetrix Electronics and suitable for battery validation labs, portable device design verification, embedded firmware development, and Li-ion gas-gauge algorithm prototyping requiring stable component supply and documented reference behavior.

Supply support for STEVAL-ISB012V1 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, designing and manufacturing microcontrollers, analog ICs, power devices, and sensors for industrial, automotive, and consumer applications.

This board belongs to ST's STEVAL (ST Evaluation) series, developed specifically to accelerate evaluation and firmware integration of ST's battery management ICs like the STC3105 in real-world portable systems.

FAQ

Does STEVAL-ISB012V1 support firmware reprogramming?

Yes - the board integrates an STM8S microcontroller that runs preloaded firmware for STC3105 communication and display control. ST provides source code and IAR EWSTM8 project files in the official design package, enabling full customization of SOC calculation, alarm thresholds, and USB data formatting.

Can STEVAL-ISB012V1 monitor multi-cell batteries?

No - it is designed exclusively for single-cell Li-ion configurations. The STC3105's analog front-end and voltage reference are optimized for 0–4.5 V input range; connecting stacked cells would exceed absolute maximum ratings and invalidate coulomb counting accuracy.

Is USB the only communication interface available?

Yes - the board uses only USB-to-serial (virtual COM port) for host communication. There is no I²C, SPI, or UART header exposed for external MCU connection; all telemetry is routed through the onboard STM8S and CH340 USB bridge IC.

What is the role of the onboard charger?

The linear charger IC (likely STBC02 or equivalent) provides regulated 4.2 V charging with thermal foldback and end-of-charge detection. It enables closed-loop testing of battery charge/discharge cycles without external power supplies, supporting automated gas-gauge calibration workflows.