STMicroelectronics STEVAL-ISB014V3

Overview

STEVAL-ISB014V3 from STMicroelectronics is an evaluation board based on the GG25L battery gas gauge IC, designed for accurate state-of-charge (SoC) estimation in portable medical and wearable fitness devices. It supports Coulomb counting and voltage-mode gas gauge operation, features 0.25% battery voltage monitoring accuracy, programmable low-battery alarm output, and internal temperature sensing for compensation.

For engineers reviewing the STEVAL-ISB014V3 datasheet, STEVAL-ISB014V3 pinout, STEVAL-ISB014V3 application, or STEVAL-ISB014V3 equivalent, this board enables rapid validation of GG25L-based battery monitoring in space-constrained, low-power wearable and healthcare systems requiring robust OCV initialization and battery-swap detection.

Technical Context

The STEVAL-ISB014V3 implements a complete hardware reference design for the GG25L - a dedicated single-cell Li-ion/Li-polymer gas gauge IC. It integrates current-sense resistor interface (CG+), I²C communication (SCL/SDA), alarm output (ALM), reset control (RSTIO), and battery detection (BATD) circuitry with precision biasing and filtering components.

It validates key GG25L capabilities including debounced open-circuit voltage measurement at power-up, dual-threshold programmable alarm signaling, and <2 µA standby current consumption - all within a compact 1.4 × 2.0 mm CSP footprint replicated on the board layout.

Key Specifications

Availability

STEVAL-ISB014V3 is available at Aetrix Electronics and suitable for wearable fitness trackers, portable medical monitors, and handheld diagnostic devices requiring stable component supply and validated gas gauge reference designs.

Supply support for STEVAL-ISB014V3 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, specializing in microcontrollers, analog ICs, power management, and sensor solutions for industrial, automotive, and consumer markets.

The STEVAL-ISB014V3 belongs to ST's ST EVAL evaluation board portfolio, engineered to accelerate development of battery-powered portable electronics by providing fully tested, documented hardware platforms for their analog and mixed-signal ICs.

FAQ

What is the primary function of the STEVAL-ISB014V3 evaluation board?

The STEVAL-ISB014V3 is a hardware reference platform for the GG25L gas gauge IC, enabling engineers to validate battery state-of-charge estimation using Coulomb counting and voltage-mode algorithms. It includes all necessary signal conditioning, I²C interface, alarm output, and battery detection circuitry pre-integrated and tested per ST's design guidelines.

Does the board support both voltage-based and current-based SoC calculation?

Yes - the board implements the full functionality of the GG25L, supporting simultaneous voltage-mode and Coulomb counter-based SoC estimation. The CG+ terminal connects to a sense resistor for current integration, while VIN and internal ADCs perform high-accuracy battery voltage sampling with 0.25% tolerance.

Can the low-battery alarm threshold be customized in firmware?

Yes - the ALM output behavior is controlled via I²C register writes to the GG25L. Engineers can program two independent thresholds (e.g., 10% and 5% SoC) and select whether the alarm triggers on low SoC, low voltage, or both conditions, with configurable hysteresis.

Is the STEVAL-ISB014V3 RoHS compliant and suitable for medical applications?

Yes - the board is RoHS compliant (as stated in the data brief) and targets portable medical equipment per its design intent and validation scope. Its low-power operation, battery-swap detection, and temperature-compensated SoC algorithm align with regulatory requirements for Class IIa wearable medical devices.