L9374LF datasheet(22/80 Pages) STMICROELECTRONICS

22 / 80 page

Circuit description

L9374LF

22/80

DocID025414 Rev 1

Circuit description

The L9374LF is a four channel low side driver with integrated recirculation diodes intended

for ABS applications. The device communicates entirely by 16 individual SPI commands. All

outputs can be switched or PWMed. Two outputs have the additional capability of providing

current regulation

It is possible to program two consecutive PWM duty cycles / Current levels at one time.

Individual switched on-times can also be generated.

All outputs have high level diagnostic capabilities. These include off state open load, under

current, shorted load, gate voltage monitoring, thermal warning and shutdown flags. Higher

level diagnostics include a Silent-Valve-Detection-test (SVDT) to verify load and driver

integrity as well as a Built-in-Self-test (BIST) to verify the internal logic integrity. The

L9374LF can detect and report a missing recirculation diode, Ground loss, Clock failure,

and synchronization failure.

4.1

SPI serial peripheral interface

The L9374LF SPI is a fully bidirectional serial interface configured as a SLAVE for

communication between a μC (the MASTER) and the L9374LF. All data management is

handled in 16 sets of SPI registers of 16 bits each. There are 16 input or command registers

and 16 status registers. All output control including current control and PWM / switching

timing is realized internally. The control parameters (Duty Cycle, Duration, and Current

regulation) are programmed via serial communication. The 16 status registers provide a

high level of diagnostic capability from output status to internal control parameter

confirmation.

Figure 10. SPI block diagram

L9374LF Datasheet(PDF) 22 Page - STMicroelectronics