STMicroelectronics STEVAL-ISB017V1

Overview

STEVAL-ISB017V1 from STMicroelectronics is an evaluation board for the STC3117 gas gauge IC, designed to demonstrate accurate battery state-of-charge (SOC) and state-of-health (SOH) monitoring in portable devices. It supports I²C communication, integrates OptimGauge™ algorithm, features low-power operation (40 µA active, 2 µA standby), and includes hardware for battery voltage, current, and temperature sensing.

For engineers reviewing the STEVAL-ISB017V1 datasheet, STEVAL-ISB017V1 pinout, STEVAL-ISB017V1 application, or STEVAL-ISB017V1 equivalent, this board enables rapid validation of STC3117-based fuel gauging in handheld, wearables, and IoT battery-powered systems with real-time SOC/SOH reporting and low-battery alarm triggering.

Technical Context

The board implements the STC3117 in a 9-bump CSP package (1.49 × 1.594 mm), interfacing via I²C (SCL/SDA) and chip-select (CS) to host microcontrollers. It provides direct access to VBAT, GND, ALM (alarm output), BATD (battery detect), and CD (charge detect) signals through dual 10-pin headers (P1/P2) and auxiliary 4-/5-pin headers (P3/P4).

On-board passive components include precision resistors (Rcg, Rup1–Rup4, Rdn1) for current-sense calibration and voltage divider networks, plus decoupling capacitors (C1–C3) and a 10 mΩ sense resistor (Rcg) enabling accurate coulomb counting and OCV-based initialization at power-up.

Key Specifications

Availability

STEVAL-ISB017V1 is available at Aetrix Electronics and suitable for handheld devices, wearable electronics, and IoT edge sensors requiring stable component supply, rapid prototyping of battery fuel gauging, and production-ready validation of SOC accuracy under varying temperature and aging conditions.

Supply support for STEVAL-ISB017V1 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-ISB017V1 belongs to ST's STC31xx evaluation platform family, engineered to accelerate development of high-accuracy battery fuel gauging systems in compact, low-power portable applications.

FAQ

What is the primary function of the STEVAL-ISB017V1 evaluation board?

The STEVAL-ISB017V1 is a dedicated evaluation platform for the STC3117 gas gauge IC. Its primary function is to demonstrate and validate real-time battery state-of-charge (SOC) and state-of-health (SOH) estimation using ST's OptimGauge™ algorithm, including OCV-based initialization, current integration, temperature compensation, and fault detection such as missing or swapped batteries.

Does the board support direct connection to a host MCU without additional level-shifting?

Yes - the STEVAL-ISB017V1 operates at 1.8–3.6 V logic levels and uses standard I²C pull-ups compatible with most 1.8 V or 3.3 V microcontrollers. SCL, SDA, and CS signals are directly accessible via P1/P2 headers; no external level shifters are required when interfacing with MCUs within the same voltage domain.

How is battery current measured on this evaluation board?

Battery current is measured using the onboard 10 mΩ sense resistor (Rcg) placed in series with the battery return path. The STC3117 internally digitizes the voltage drop across Rcg to compute average current and perform coulomb counting. Calibration coefficients can be programmed via I²C to compensate for resistor tolerance and PCB layout effects.

Can the STEVAL-ISB017V1 be used to evaluate battery swap detection and protection features?

Yes - the board implements full battery swap detection logic via the BATD pin and internal firmware of the STC3117. When a battery is removed or replaced, the IC detects voltage transients and OCV discontinuities, triggers the ALM output, and prevents false insertion by enforcing a minimum stabilization delay before resuming SOC calculation - all verifiable using the provided headers and I²C register reads.