STMicroelectronics STEVAL-ISB014V2

Overview

STEVAL-ISB014V2 from STMicroelectronics is an evaluation board for the STC3115 gas gauge IC, designed to demonstrate battery state-of-charge (SOC) estimation using mixed-mode Coulomb counting and voltage-based algorithms. It supports 2.7–4.5 V Li-ion/Li-polymer batteries, features programmable low-SOC/voltage alarms via open-drain ALM output, and includes on-board current-sense resistor (10 mΩ), decoupling capacitors, and I²C interface for real-time register access and configuration.

For engineers reviewing the STEVAL-ISB014V2 datasheet, STEVAL-ISB014V2 pinout, STEVAL-ISB014V2 application, or STEVAL-ISB014V2 equivalent, this board enables rapid validation of STC3115 integration in handheld power management systems - including SOC accuracy verification under dynamic load, alarm threshold calibration, and mixed-mode algorithm behavior across temperature and discharge profiles.

Technical Context

The STEVAL-ISB014V2 implements the STC3115's dual-gas-gauge architecture: a 14-bit sigma-delta ADC performs 500 ms current conversions (5.88 µV LSB) and 250 ms voltage/temperature conversions (2.20 mV / 1 °C resolution), synchronized to a 32.768 kHz internal oscillator with ±2.5% accuracy. The board routes CG and VIN pins with dedicated Kelvin connections to isolate sense-path ground, preserving <±0.5% voltage measurement accuracy and enabling robust OCV-based SOC initialization at power-up.

It exposes all critical STC3115 control signals - SDA/SCL (I²C up to 400 kHz), ALM (open-drain, pull-up required), RSTIO (reset sense/control), and BATD/CD (battery detection/charge inhibit) - allowing full functional testing of battery swap detection, standby mode entry (2 µA), and alarm latching behavior per REG_CTRL bit states.

Key Specifications

Availability

STEVAL-ISB014V2 is available at Aetrix Electronics and suitable for battery fuel gauging validation, handheld device power management development, and embedded Li-ion battery health monitoring requiring stable component supply and documented reference design implementation.

Supply support for STEVAL-ISB014V2 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, specializing in microcontrollers, analog ICs, and power management solutions for automotive, industrial, and consumer markets.

The STEVAL-ISB014V2 belongs to ST's STC31xx evaluation platform family, engineered specifically to accelerate adoption of high-accuracy battery fuel gauging in space-constrained portable electronics with minimal external component count.

FAQ

What battery chemistries does the STEVAL-ISB014V2 support?

The board is configured for single-cell Li-ion and Li-polymer batteries (2.7–4.5 V), leveraging the STC3115's built-in OCV curve modeling and configurable REG_VM_CNF parameter to adapt to varying internal resistance and capacity profiles across common handheld battery types.

How do I configure the low-battery alarm thresholds?

Thresholds are programmed via I²C writes to REG_SOC_ALM (0.5% SOC steps, default = 2 → 1%) and REG_ALARM_VOLTAGE (17.60 mV steps, default = 170 → 3.00 V); the ALM pin asserts low when either condition is met and remains latched until ALM_SOC/ALM_VOLT bits in REG_CTRL are cleared by host firmware.

Does the board support battery swap detection?

Yes - the BATD/CD pin is routed to a test point and configured per STC3115's battery detection logic; insertion/removal triggers automatic OCV reinitialization and SOC reset, validated via RSTIO pin behavior and REG_MODE register status during hot-swap testing.

Can I use the STEVAL-ISB014V2 for production-level accuracy validation?

Yes - its PCB layout follows AN4324 guidelines: isolated CG/GND Kelvin routing, dedicated VCC plane, and 1 µF C1 decoupling minimize noise coupling; measured voltage accuracy stays within ±0.5% and current sensing maintains ±0.5% full-scale error under 1 A load per STC3115 datasheet conditions.