ST STEVAL-L99MH98 User Manual

UM3443
User manual
STEVAL-L99MH98 evaluation board
Introduction
The STEVAL-L99MH98 is a low-cost application board designed to evaluate L99MH98, a smart power device designed by
STMicroelectronics inVFQFN48L package with exposed pad.
L99MH98 is an integrated octal half-bridge pre-driver dedicated to control up to sixteen N-channel MOSFETs. It is intended for
DC motor control applications such as automotive power seat control or other applications. A 24-bit serial peripheral interface
(SPI) is used for configuring and controlling the eight half-bridges or four H‑bridge. SPI status registers provide high-level
diagnostic information such as supply voltage monitoring, the charge pump voltage monitoring, temperature warning and
overtemperature shutdown. Each gate driver monitors independently its external MOSFET drain-source voltage for fault
conditions. The L99MH98 supports indirect current measurement on external MOSFETs, allowing cost saving and lower system
complexity, avoiding the usage of shunt resistors. A more efficient gate current control of the external MOSFETs, called "three
stages gate current", decreases and optimizes electromagnetic interference (EMI). Protection features (drain-source monitoring
for short circuit detection, overtemperature warning and shutdown,
timeout watchdog for MCU control, detailed off-state diagnostic via SPI) ensure the ASIL-B achievement according to ISO
26262 standard.
Thanks to the expansion connectors, STEVAL-L99MH98 allows the complete control of L99MH98 communication interface
(SPI) and parallel input/output. The evaluation board can be also controlled using a Graphical User Interface.
Figure 1. STEVAL-L99MH98 board
Notice: For dedicated assistance, submit a request through our online support portal at www.st.com/support.
UM3443 - Rev 1 - December 2024
www.st.com
For further information contact your local STMicroelectronics sales office.