STMicroelectronics AEK-MOT-4DCMH94 Evaluation Board

STMicroelectronics AEK-MOT-4DCMH94 Evaluation Board is a configurable quad half-bridge or dual H-bridge DC motor driver board based on the L99MH94 half-bridge pre-drivers. The board is designed to drive brushed DC motors across body control and convenience applications, including seat control, steering column adjustment, gas pedal adjustment, sunroof, sliding doors, window lift, and washer pump systems. The board can drive four configurable channels in half-bridge mode or two channels in full-bridge mode, allowing two motors to run simultaneously.

The STMicroelectronics AEK-MOT-4DCMH94 supports current measurement either via shunt resistors or indirectly using the R_DS(on) of MOSFETs external to the L99MH94. The control board manages the L99MH94 pre-drivers through a 24-bit SPI interface, while SPI status registers provide diagnostic information for supply voltage, charge pump voltage, temperature warnings, and overtemperature shutdown. The board also includes off-state diagnostics for short-to-ground, short-to-battery, and open-load conditions, as well as reverse-polarity protection and AutoDevKit ecosystem support via the STSW-AUTODEVKIT.

Features

Configurable quad half-bridge or dual H-bridge predriver board for DC motors in automotive applications
Independent channel driver support for external high-side or low-side MOSFETs
Adaptive MOSFET gate control with three-step gate control for external MOSFETs
Protection and diagnostic support with watchdog timeout, drain-source monitoring, undervoltage lockout, reverse battery protection, and overtemperature warning and shutdown
Optimized EMI performance and reduced switching losses in PWM level mode

Detailed off-state diagnostics through SPI for short-to-ground, short-to-battery, and open-load detection
Direct current measurement through shunt resistors and indirect current measurement through external MOSFET R_DS(on) monitoring
96-pin plug-and-play automotive unified connector for MCU board connection
AutoDevKit ecosystem support with a dedicated demo available in STSW-AUTODEVKIT release 2.9

Applications

Automotive motor control
Body and convenience systems
Chassis and safety systems
Seat control
Steering column adjustment
Gas pedal adjustment
Sunroof control

Sliding doors
Window lift
Washer pump
Seatbelt pretensioners
Central door lock crash unlock
Engine vibration compensation systems
Resistive loads, including heaters and fans

Specifications

L99MH94 quad half-bridge or dual H-bridge predriver for DC motor applications
Four configurable channels in half-bridge mode or two channels in full-bridge mode
Motor drive current of 15A per single channel in half-bridge mode
Motor drive current of 30A at V_BAT = 14V per double channel in full-bridge mode

Programmable gate current up to 120mA
Load channel direct current measurement through shunt resistors from 1.5A to 50A
24-bit SPI interface for L99MH94 management
ASIL-B compliance support according to ISO 26262
96-pin automotive unified connector for MCU board connection
112mm x 180mm board size
RoHS compliance grade of Ecopack2 and WEEE compliance