STEVAL-L9800 [STMicroelectronics]

The STEVAL-L9800 is a tool designed to evaluate the L9800 smart power device, designed by STMicroelectronics in advanced BCD technology. The L9800 is an 8-channel IC with eight LS drivers designed for automotive applications (LEDs and relays) and compatible with resistive, inductive, and capacitive loads. The device offers advanced diagnostic and protection functionalities such as short to GND, open load, overcurrent, and overtemperature detection. The 8 output channels can be driven by SPI or by 2 dedicated parallel inputs that can be associated to different output thanks to a programmable internal multiplexer. Limp home functionality is also featured, which allows the use of 2 selected drivers in specific fault conditions, such as SPI fault, microcontroller fault, or supply UV. Daisy chain compatibility even with 8-bit SPI is available. The device is able to ensure operation in cranking scenarios down to VBATT = 3 V and very low quiescent current in the SLEEP condition.

A serial peripheral interface (SPI) is used for control and configuration of the loads and the device. Status feedback of all diagnostic functions is also provided.

There are two input pins available for direct control and PWM: these are connected to two defined outputs by default, but additional or different output mapping can be controlled by SPI. Thanks to the expansion connectors, the STEVAL-L9800 allows the complete control of L9800 communication interface (SPI) and parallel input/output.

The evaluation platform may also be controlled through a graphical user interface (GUI) on the AEK-MCU-C1MLIT1 hardware interface.

• Operating input voltage: 3 V to 28 V
• Eight LS drivers up to 0.5 A
• Idle mode for reduced current consumption
• Possible daisy chain configuration
• Two parallel input pins with input mapping functionality
• SPI communication interface for control and diagnostics
• Reference design with optimized bill of materials
• L9800 hosted in QFN24 package
• 4-layer PCB (70 x 55 mm)