L9800 datasheet(2/55 Pages) STMICROELECTRONICS

2 / 55 page

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Diagnostic features

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Latched diagnostic information via SPI register

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Overcurrent and overtemperature detection at on state

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Off state diagnosis, able to detect and distinguish open load and short to GND conditions

Applications

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Low-side switches for 12 V in automotive or industrial applications such as lighting, heating, motor driving,

energy and power distribution

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Especially designed for driving relays, LEDs and motors

Description

The L9800 is an 8-channel LS driver 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 open load, overcurrent and overtemperature detections, short to GND. The eight output channels can be

driven by SPI or by dedicated parallel inputs. Limp-home functionality is present. Daisy chain available (no

constraint on SPI number of bits of devices in chain). The device is able to guarantee cranking scenario down to

VBATT = 3 V and ensures very low-quiescent current under RESET.

The device is an 8-channel low-side power switch in a TFQFN24 4x4x0.9 package. It is specially designed to

control relays and LEDs in automotive and industrial applications.

A serial peripheral interface (SPI) is used for control and diagnosis of the loads as well as of the device. For direct

control and PWM there are two input pins (IN0 and IN1) available, connected to two outputs by default (OUT2 and

OUT3). Additional or different outputs can be controlled by the same input pins if programmed by SPI.

L9800

DS14041 - Rev 2

page 2/55

L9800 データシート(PDF) 2 Page - STMicroelectronics