STMicroelectronics STEVAL-L99615C

Overview

STEVAL-L99615C from STMicroelectronics is an evaluation kit comprising the L9961 battery monitor IC expansion board and the NUCLEO-G071RB STM32 development board, enabling full-stack BMS validation for up to 5-series Li-ion packs. It delivers synchronized cell voltage (±10 mV accuracy), stack current (via integrated shunt amplifier), NTC temperature sensing, overcurrent detection via coulomb counting, and embedded charge/discharge MOSFET control.

For engineers reviewing the STEVAL-L99615C datasheet, STEVAL-L99615C pinout, STEVAL-L99615C application, or STEVAL-L99615C equivalent, this kit supports rapid firmware integration, GUI-based real-time monitoring (STSW-L99615C), I²C interface validation, and industrial BMS design verification including OV/UV threshold testing and fuse emulation.

Technical Context

The kit implements a complete hardware-software BMS reference: the L9961 IC performs simultaneous 5-cell voltage sampling with no inter-cell desynchronization, while the STM32G071RB (Arm Cortex-M0+, 128 KB Flash) runs preloaded firmware to manage I²C communication, fault reporting (FAULTN, FAULTN_SAFE), and GPIO-controlled charge/discharge sequencing.

Expansion board schematics confirm direct morpho connector stacking onto NUCLEO-G071RB, with dedicated analog inputs for NTC, isolated current sense (ISENSEN/ISENSEP), and power path routing through STL210N4F7 MOSFETs and STL7N6F7 fuse emulator - all coordinated via L9961's OD, CHG, DCHG, and FUSE control terminals.

Key Specifications

Availability

STEVAL-L99615C is available at Aetrix Electronics and suitable for power tool BMS validation, industrial cordless equipment qualification, and 5-cell Li-ion pack safety certification requiring stable component supply and repeatable test platform access.

Supply support for STEVAL-L99615C 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 devices, and sensors for industrial, automotive, and consumer applications.

The STEVAL-L99615C belongs to ST's battery management evaluation platform family, engineered to accelerate adoption of the L9961 for industrial-grade BMS designs requiring high-accuracy cell monitoring and integrated protection logic.

FAQ

What firmware is preloaded on the NUCLEO-G071RB included in the STEVAL-L99615C?

The NUCLEO-G071RB ships with factory-programmed firmware that establishes I²C communication with the L9961, reads cell voltages, stack current, and NTC data, and exposes status flags (RDY, FAULTN) via GPIO. This firmware is compatible with the STSW-L99615C PC GUI for real-time visualization and threshold configuration.

Can the STEVAL-L99615C be used with battery packs other than 5-cell Li-ion configurations?

Yes - the expansion board accepts external DC input (via J5 power connector) to emulate any 5-cell stack voltage (15–22 V). While optimized for 5-cell Li-ion, it supports alternative chemistries if voltage thresholds and NTC curves are reconfigured in firmware; cell count is fixed by L9961 hardware architecture.

Does the kit include hardware-level fault isolation between the L9961 and STM32G071RB?

No galvanic isolation is implemented - I²C lines (SDA/SCL), RDY, FAULTN, and WAKEUP signals connect directly between the L9961 and STM32G071RB pins per schematic Figure 1. Protection relies on L9961's internal fault latching and software-handled response, not hardware isolation.

Is the STSW-L99615C GUI compatible with Linux or macOS?

STSW-L99615C is officially supported only on Windows 10/11 (64-bit) and requires Microsoft .NET Framework 4.7.2. No native Linux or macOS version is provided by ST; cross-platform alternatives would require custom serial/I²C bridge implementation and parsing of raw L9961 register dumps.