STMicroelectronics STEVAL-ISB013V1

Overview

STEVAL-ISB013V1 from STMicroelectronics is a battery monitor demonstration board built around the STC3105 gas gauge IC, delivering accurate voltage measurement, coulomb counting for state-of-charge (SOC) tracking, programmable low-battery alarm output, and relaxation timer functionality for OCV-based SOC correction in portable lithium-ion battery systems.

For engineers reviewing the STEVAL-ISB013V1 datasheet, STEVAL-ISB013V1 pinout, STEVAL-ISB013V1 application, or STEVAL-ISB013V1 equivalent, this board enables rapid validation of STC3105-based fuel gauging in handheld medical devices, wearables, and IoT edge sensors requiring precise runtime estimation and low-power alarm signaling.

Technical Context

The board implements the STC3105's dual-sensing architecture: analog front-end measures battery voltage and current via shunt resistor, while its internal 32.768 kHz time base synchronizes coulomb integration and relaxation timing. The I²C interface provides real-time access to SOC, voltage, current, and alarm status registers.

Alarm logic supports independent threshold programming for SOC (%) and battery voltage (mV), with configurable hysteresis; the relaxation timer activates only when load current falls below user-defined threshold, triggering OCV measurement for SOC recalibration without system interruption.

Key Specifications

Availability

STEVAL-ISB013V1 is available at Aetrix Electronics and suitable for battery fuel gauging validation, portable medical device development, and wearable power management prototyping requiring stable component supply and documented reference design support.

Supply support for STEVAL-ISB013V1 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, and sensor solutions for industrial, automotive, and consumer markets.

The STEVAL evaluation board series targets rapid adoption of ST's analog and power ICs, providing validated hardware, schematics, and firmware examples to accelerate customer design-in of gas gauge, battery protection, and energy monitoring solutions.

FAQ

What is the primary function of the STEVAL-ISB013V1 board?

The STEVAL-ISB013V1 is a demonstration board for the STC3105 battery monitor IC. It performs real-time voltage and current sensing, calculates state-of-charge using coulomb counting, triggers low-SOC/low-voltage alarms, and implements a relaxation timer to schedule open-circuit voltage measurements for SOC correction-enabling accurate fuel gauging in single-cell Li-ion applications.

Does the board include firmware or software support?

Yes, ST provides firmware examples and register configuration guides for the STC3105 IC on the STEVAL-ISB013V1, including I²C initialization sequences, alarm threshold setup, and relaxation timer control. These are available in the STSW-ISB013 software package and referenced in Application Note AN3894.

Can the alarm output drive external circuitry directly?

Yes-the ALM pin is an open-drain output rated for 5.5 V and 20 mA sink current. It can directly interface with standard logic-level inputs or drive LEDs through a pull-up resistor, eliminating need for level-shifting or buffer stages in most host systems.

Is the board RoHS compliant and suitable for production use?

Yes, the STEVAL-ISB013V1 is RoHS compliant per ST's declaration in the data brief. However, it is intended as a demonstration and development tool-not a production-ready module. For volume deployment, designers must implement the STC3105 into their own PCB layout following ST's layout guidelines and thermal recommendations.