STMicroelectronics STEVAL-ISB009V1

Overview

STEVAL-ISB009V1 from STMicroelectronics is a Li-ion battery monitoring and gas-gauge demonstration board built around the STC3100 fuel gauge IC, enabling real-time voltage (±0.5 % accuracy), current (up to 2.5 A), temperature, and state-of-charge tracking via integrated 12–14-bit ADC and Coulomb counting (1 % accuracy with external RTC). It targets portable medical devices, handheld test equipment, and smart battery packs.

For engineers reviewing the STEVAL-ISB009V1 datasheet, STEVAL-ISB009V1 pinout, STEVAL-ISB009V1 application, or STEVAL-ISB009V1 equivalent, this board provides validated hardware for rapid evaluation of single-cell Li-ion battery fuel gauging-including I²C register access, low-power operation (2 µA standby), and configurable gas-gauge calibration-prior to custom PCB integration.

Technical Context

The board implements the STC3100's dual-slope ADC architecture for high-precision voltage and current sensing, with internal temperature compensation and programmable gain settings. Its coulomb counter integrates current samples over time using either the internal 32 kHz oscillator or an external RTC reference to achieve 1 % SoC accuracy.

Hardware design includes shunt-based current measurement (supports ±7000 mAh capacity range, 0.2 mAh resolution), dedicated analog front-end filtering, and I²C-level-shifting circuitry compatible with 1.8 V–5.5 V host controllers. All critical signals are routed to accessible test points and headers for oscilloscope probing and firmware validation.

Key Specifications

Availability

STEVAL-ISB009V1 is available at Aetrix Electronics and suitable for battery-powered medical monitors, portable instrumentation, and industrial handheld terminals requiring stable component supply and validated reference designs for Li-ion fuel gauging.

Supply support for STEVAL-ISB009V1 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 management, sensors, and automotive-grade components.

The STEVAL evaluation board series delivers application-specific, fully tested hardware platforms for ST's analog and mixed-signal ICs-designed to accelerate development of battery management, motor control, and sensor interface systems.

FAQ

What battery chemistries does STEVAL-ISB009V1 support?

STEVAL-ISB009V1 is specifically designed for single-cell Li-ion and Li-polymer batteries. It is not configured for NiMH, lead-acid, or multi-cell stacks. The STC3100 IC on board uses voltage, temperature, and current profiles optimized for Li-based chemistries, with built-in protection against overvoltage and deep discharge conditions typical of these cells.

Can the board operate without an external RTC signal?

Yes-the board uses the STC3100's internal 32 kHz oscillator by default, delivering 3.5 % Coulomb counter accuracy. An external RTC input (via J2 pin 3) improves SoC accuracy to 1 %; no hardware modification is required, only firmware configuration of the STC3100's clock source register.

Is the shunt resistor value fixed or user-replaceable?

The board includes a factory-installed 5 mΩ, 1 % tolerance shunt resistor (R2) optimized for ±2.5 A full-scale current sensing. The footprint supports replacement with other 0805-size resistors, but recalibration of the STC3100's current gain register is mandatory to maintain accuracy after substitution.

Does STEVAL-ISB009V1 provide overcurrent or short-circuit protection?

No-the board is a monitoring-only platform and lacks active protection circuitry such as MOSFET drivers or fault latching. It reports current and voltage in real time via I²C but relies on the host system or external power path controller to implement safety responses like load disconnect or charger throttling.