STMicroelectronics EVAL-L99H02QF

Overview

EVAL-L99H02QF from STMicroelectronics is an evaluation board for the L99H02QF dual-channel high-side/low-side gate driver IC, designed specifically for automotive DC motor control applications. It integrates a pre-assembled L99H02QF daughterboard with an STM8A-based motherboard featuring SPI interface, real-time diagnostics, and GUI-controlled parameter configuration. Key confirmed capabilities include 6–28 V operating supply, 30 kHz PWM operation, integrated charge pump (100% duty cycle), reverse battery protection control, and current sense amplifier with zero-adjust trimming.

For engineers reviewing the EVAL-L99H02QF datasheet, EVAL-L99H02QF pinout, EVAL-L99H02QF application, or EVAL-L99H02QF equivalent, this board enables rapid validation of L99H02QF's motor drive performance-including free-wheeling control, thermal monitoring via embedded sensors, and diagnostic feedback on motor evolution and board temperature-within automotive-grade power stages.

Technical Context

The EVAL-L99H02QF comprises two tightly coupled PCBs: a daughterboard hosting the L99H02QF IC with its full gate-drive signal chain (EN, DIR, PWM, CSN, CLK, DI, DO, CSO, CSI1±, CSI2±, TS, GL/SL/GH/SH pins), and a motherboard centered on an STM8AF51xAT microcontroller that implements SPI master communication, LIN/CAN physical layer support, USB-to-serial bridging (FT232RL), and real-time GUI-driven register access. The system supports dual independent motor channel evaluation through configurable VS_A/VS_B power domains.

Hardware-level features include reverse battery MOSFET control circuitry, programmable freewheeling modes, thermal sensing via LM135 and on-die temperature reporting (TS pin), and precision current sensing using 2 mΩ shunt resistors (R18, R28) with differential amplification. All critical signals-including charge pump (CP), gate drivers (GH1/GL1/SH1/SL1, GH2/GL2/SH2/SL2), and fault reporting-are routed to test points (TP1–TP16) and external headers (IO_CON1–IO_CON12) for oscilloscope validation.

Key Specifications

Availability

EVAL-L99H02QF is available at Aetrix Electronics and suitable for automotive ECU development, body control module prototyping, and HVAC blower motor validation requiring stable component supply and production-representative thermal/power behavior.

Supply support for EVAL-L99H02QF 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, Switzerland, specializing in automotive, industrial, and power management solutions with broad IP portfolios and AEC-Q100 qualified product lines.

The EVAL-L99H02QF belongs to ST's automotive motor control evaluation platform family, engineered to accelerate design-in of high-reliability gate drivers in safety-critical 12 V/24 V vehicle subsystems such as seat adjusters, window lifts, and cooling fans.

FAQ

What software tools are required to operate EVAL-L99H02QF?

The official ST Motor Control Workbench GUI software is required, supporting Windows OS and communicating over USB virtual COM port. It provides real-time register configuration, diagnostic dashboard (motor speed, temperature, fault flags), and waveform capture of PWM, current sense, and gate drive signals via onboard ADC and logic analyzers.

Does EVAL-L99H02QF support both brushed and brushless DC motors?

EVAL-L99H02QF is optimized for brushed DC motor control using the L99H02QF's dual half-bridge architecture. While it can drive 3-phase BLDC motors in trapezoidal mode with external commutation logic, no built-in FOC or Hall sensor interface is provided - BLDC use requires custom firmware on the STM8A motherboard.

Can the board be powered directly from a car battery?

Yes - the daughterboard accepts 6 V to 28 V input via Vs_Per and Vs_B terminals, with reverse polarity protection implemented by Q1 (STB270N04) controlled by the L99H02QF. Transient suppression is provided by SMCJ24CA TVS diode (U1 pin 1), meeting ISO 7637-2 pulse 5a requirements.

Are schematics and layout files publicly available?

Yes - complete top/mid/bottom Gerber files and detailed application schematics (including L99H02QF daughterboard and STM8 motherboard) are published in DB4546 Rev 2 (November 2021), freely downloadable from ST's official website under document number DB4546.