STMicroelectronics STEVAL-ISB003V1

Overview

STEVAL-ISB003V1 from STMicroelectronics is a demonstration board implementing a USB-powered single-cell Li-Ion battery charger, built around the ST72F60E2M1 low-speed USB microcontroller and ST7FLIT15BY0M6 battery charge controller. It supports 250 mA max charging current, operates from USB (5 V) or external 5 V/1 A supply, and integrates a L6920D-based step-up converter and TL1431-based precision voltage reference for charger control - used in portable audio devices such as MP3 players.

For engineers reviewing the STEVAL-ISB003V1 datasheet, STEVAL-ISB003V1 pinout, STEVAL-ISB003V1 application, or STEVAL-ISB003V1 equivalent, this page provides verified functional architecture, power-path topology, USB controller interface mapping, and reprogrammable ICP header details essential for evaluation and system integration.

Technical Context

The board implements a modified non-inverting buck-boost converter (per AN2390) to deliver regulated charging voltage to a single Li-Ion cell. The ST7FLIT15BY0M6 handles analog sensing (AIN0–AIN4), PWM-controlled switching (ATPWM0/2/3), and comparator-based termination logic, while the ST72F60E2M1 manages USB enumeration, status reporting, and host command parsing via low-speed USB 1.1.

Power selection is handled by discrete MOSFETs (STT3PF30L, 2STR1215) and diodes (1N5817/1N5819), with dual regulation paths: one for USB controller (L6920D step-up to 3.3 V) and another for charger IC (TL1431 reference + linear regulator). Current limiting and fault indication are implemented via series resistors (R26: 0.5 W, 1 %) and status LEDs (D3/D4/D8/D9).

Key Specifications

Availability

STEVAL-ISB003V1 is available at Aetrix Electronics and suitable for USB-powered portable audio, handheld medical monitors, and rechargeable IoT sensor nodes requiring stable component supply and validated firmware-ready hardware.

Supply support for STEVAL-ISB003V1 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 ICs, sensors, and analog/mixed-signal products for industrial, automotive, and consumer applications.

This board belongs to ST's STEVAL (ST Evaluation) series - purpose-built to demonstrate complete subsystem functionality using ST's own controllers and power management ICs, accelerating design validation for battery-powered USB peripherals.

FAQ

What microcontroller is used on the STEVAL-ISB003V1 board?

The board uses the ST72F60E2M1 - an 8-bit ST7 core microcontroller with integrated low-speed USB transceiver, 32 KB Flash, and 1 KB RAM. It runs the USB device firmware and communicates with the ST7FLIT15BY0M6 charger IC via GPIO and SPI-like signals (SCK/MISO/MOSI pins mapped to PB1–PB3).

Can the STEVAL-ISB003V1 charge batteries other than single-cell Li-Ion?

No - the board is specifically designed for single-cell Li-Ion (nominal 3.7 V, full-charge 4.2 V). Its feedback network, TL1431 reference, and ST7FLIT15BY0M6 configuration target 4.2 V ±1 % CV termination and 250 mA CC current; altering components would be required for LiFePO₄ or multi-cell configurations.

Does the board support firmware updates in-system?

Yes - it features two dedicated ICP (In-Circuit Programming) headers: J3 (12-pin) for the ST72F60E2M1 and J4 (12-pin) for the ST7FLIT15BY0M6. Both support ST's standard ICC programming protocol using STVP or compatible tools, enabling field firmware revision without chip removal.

Is USB host communication required for basic charging operation?

No - the board can operate stand-alone when powered by external 5 V/1 A supply. USB connection is optional and used only for status reporting (e.g., charge progress, fault codes) and host-initiated control; the charge algorithm executes autonomously once enabled via SW1/SW2 reset buttons.