STMicroelectronics STEVAL-ISB041V1

Overview

STEVAL-ISB041V1 from STMicroelectronics is an evaluation board for the STBC02 single-cell Li-Ion/Li-Po battery power management IC, integrating linear charging (CC-CV), dual 3 Ω SPDT load switches, an always-on LDO regulator, battery protection circuitry, and smart reset logic. It supports programmable fast-charge/pre-charge currents up to 450 mA, adjustable floating voltage up to 4.45 V, and operates in standalone or single-wire-controlled mode.

For engineers reviewing the STEVAL-ISB041V1 datasheet, STEVAL-ISB041V1 pinout, STEVAL-ISB041V1 application, or STEVAL-ISB041V1 equivalent, this board enables rapid validation of battery charging, system power sequencing, low-quiescent-power shutdown, and intelligent reset behavior in portable medical devices, wearables, and IoT edge nodes with constrained battery capacity and strict power budgeting.

Technical Context

The board implements the full functional interface of the STBC02 IC, including CC-CV charge control with resistor-programmable current thresholds, dual independent SPDT load switches for dynamic power domain isolation, and a dedicated WAKE_UP input triggering hardware reset via integrated watchdog logic. The LDO regulator delivers stable output from either USB input (VBUS) or battery, with automatic source selection and <100 nA shutdown current.

System-level control is enabled through a single-wire interface (SW_SEL, CEN, WAKE_UP, RESET_NOW) that configures charge enable, reset assertion, and wake-up events without requiring a microcontroller. Battery monitoring includes BATSNSFV (full-voltage sense), BATMS (multi-point monitoring), and NTC thermistor support for temperature-aware charging.

Key Specifications

Availability

STEVAL-ISB041V1 is available at Aetrix Electronics and suitable for portable medical monitors, wearable health trackers, Bluetooth LE sensors, and industrial handheld terminals requiring stable component supply, validated battery management reference designs, and rapid prototyping of low-power embedded systems.

Supply support for STEVAL-ISB041V1 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 devices, and MEMS sensors for industrial, automotive, and consumer applications.

The STEVAL-ISB041V1 belongs to ST's STBC series of highly integrated battery management solutions, engineered specifically for space-constrained, battery-powered edge devices needing autonomous charge control, ultra-low standby power, and intelligent system-level power sequencing.

FAQ

What input sources can power the STEVAL-ISB041V1 board?

The board accepts power from a micro-AB USB connector (VBUS, 4.5–5.5 V) or directly from a single-cell Li-Ion/Li-Po battery (2.7–4.45 V). Internal circuitry automatically selects the active source: USB input powers both the battery charger and LDO when present; otherwise, the battery supplies the LDO and system loads via the SPDT switches.

How is charge current programmed on the STEVAL-ISB041V1?

Fast-charge current is set using an external resistor between the ISET pin and GND; pre-charge current uses the IPRE pin with a separate resistor. Both resistors scale linearly per STBC02's internal reference: e.g., 3.3 kΩ on ISET yields ~100 mA fast-charge current. Resistor values are documented in the STBC02 datasheet and verified on the board schematic.

Does the board support battery temperature monitoring?

Yes - the STEVAL-ISB041V1 provides dedicated header J19 for connecting an NTC thermistor to the STBC02's NTC pin. This enables temperature-dependent charge current/voltage derating and thermal cutoff, as defined in the STBC02's protection logic and confirmed in the board's schematic and BOM.

Can the dual SPDT load switches be controlled independently?

Yes - SW1_I/SW1_OA/SW1_OB and SW2_I/SW2_OA/SW2_OB are fully independent. Each switch has dedicated control paths routed to test points and headers (J7, J15), allowing discrete activation/deactivation. Their 3 Ω R_ON and 100 nA leakage are specified in the STBC02 datasheet and validated in the board's layout and component selection.