STMicroelectronics STEVAL-ISQ008V1

Overview

STEVAL-ISQ008V1 from STMicroelectronics is an evaluation board for single-cell Li-Ion battery fuel gauge implementation, based on the STM32F103x ARM Cortex-M3 microcontroller, featuring a 12-bit on-chip ADC for Coulomb counting, dual power input (USB or 5 V DC), and integrated LCD display for real-time capacity monitoring in mAh.

For engineers reviewing the STEVAL-ISQ008V1 datasheet, STEVAL-ISQ008V1 pinout, STEVAL-ISQ008V1 application, or STEVAL-ISQ008V1 equivalent, this board enables rapid validation of battery state-of-charge algorithms, USB-powered embedded fuel gauge systems, and hardware-accelerated current integration architectures using STM32's analog and timing peripherals.

Technical Context

The board implements real-time Coulomb counting by measuring both charge and discharge currents via precision operational amplifier circuitry feeding the STM32F103x's 12-bit ADC, with firmware performing numerical integration to compute remaining capacity in mAh. It uses internal STM32 timers and GPIOs to drive a 2-line LCD module without external controllers.

Power management includes automatic source selection between USB VBUS and external 5 V DC, regulated down to 3.3 V for MCU and analog sections, with dedicated current-sense paths for bidirectional measurement across the battery terminal using shunt resistors and op-amp gain stages.

Key Specifications

Availability

STEVAL-ISQ008V1 is available at Aetrix Electronics and suitable for battery management validation, portable medical device prototyping, and handheld industrial instrument development requiring stable component supply and legacy design continuity.

Supply support for STEVAL-ISQ008V1 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, power devices, sensors, and analog ICs for industrial, automotive, and consumer applications.

This evaluation board belongs to ST's STEVAL (ST Evaluation) series, purpose-built to demonstrate reference implementations of battery monitoring, power management, and embedded firmware algorithms using STM32 MCUs.

FAQ

Is STEVAL-ISQ008V1 still in active production?

No. STEVAL-ISQ008V1 is marked as Obsolete in ST's official documentation (Doc ID 18364 Rev 1, January 2011). It remains available through authorized distributors and Aetrix Electronics for legacy design support and repair BOM fulfillment, but no new silicon revisions or firmware updates are planned.

Does this board include a dedicated fuel gauge IC?

No. STEVAL-ISQ008V1 implements fuel gauging entirely in firmware on the STM32F103x MCU, using its 12-bit ADC and timers for Coulomb counting. There is no standalone fuel gauge IC (e.g., bq27xxx or MAX1704x) on the board - all capacity calculation logic runs on the ARM Cortex-M3 core.

Can the board measure battery voltage and temperature?

Yes - the schematic shows dedicated ADC channels connected to battery voltage (via resistor divider) and an NTC thermistor interface. However, the documented firmware focus is on current-based Coulomb counting; voltage and temperature readings are present in hardware but not highlighted as primary features in the data brief.

What debug interface does STEVAL-ISQ008V1 support?

The board includes standard 20-pin JTAG/SWD headers compatible with ST-LINK, RLink, and other ARM Cortex-M debug probes. Pin assignments follow ST's SWD protocol mapping (SWCLK, SWDIO, NRST, GND), enabling full firmware download, breakpoint debugging, and real-time register inspection during fuel gauge algorithm development.