STMicroelectronics STEVAL-L99MH98 Evaluation Board
STMicroelectronics STEVAL-L99MH98 Evaluation Board is a low-cost tool designed to evaluate the L99MH98 smart power device in a VFQFN48L package with an exposed pad. The L99MH98 is an integrated octal half-bridge pre-driver dedicated to controlling up to sixteen N-channel MOSFETs. The pre-driver 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-bridges. SPI status registers provide high-level diagnostic information such as supply voltage monitoring, charge pump voltage monitoring, temperature warning, and overtemperature shutdown. Each gate driver independently monitors the correlating external MOSFET drain-source voltage for fault conditions. The L99MH98 supports indirect current measurement on external MOSFETs, allowing cost savings 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, and detailed off-state diagnostic via SPI) ensure the ASIL-B achievement according to the ISO 26262 standard. Thanks to the expansion connectors, the STMicroelectronics STEVAL-L99MH98 allows the complete control of the L99MH98 communication interface (SPI) and parallel input/output. The evaluation board can also be controlled using a graphical user interface (GUI).
Features
- Operating input voltage ranges
- 6V to 28V for VDH
- 5V/3.3V for Vdd
- Octal half-bridge or quad H-bridge pre-driver
- SPI communication interface for control and diagnostics
- Up to 120mA programmable gate current
- Fully configurable half-bridge driver in case of fault occurrence
- Evaluation board design with optimized bill of materials
- EN input
- Vds monitoring
- Drain-source monitoring for short circuit detection
- Output
- 8x half-bridge/4x full bridge pre-driver
- 8-channel to drive up to 8x high-/low-side mosfet, 10A
- DIAGN pin output
- Three PWM inputs
- High- and low-side PWM capable
- Configurable overvoltage threshold
- L99MH98 hosted in VFQFPN48L package
- 4-layer 200mm x 100mm PCB
- RoHS compliant
Applications
- Automotive
- Power seat controls
- Sunroofs, sliding doors, window lifts, seat-belt pretensioners, cargo covers, and washer pumps
- Steering column or gas pedal adjustment
- General DC motor control
- Industrial automation
- Home automation
Required Equipment
- 6V to 28V power supply with current capability up to 10A
- 2A DC motor load, 20kHz, 50% duty
- Oscilloscope and/or multimeter
Related Pre-Driver
STMicroelectronics L99MH98 Automotive Octal Half-Bridge Pre-Driver
Intended for DC motor control applications such as automotive power seat control.
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