L9678P datasheet(160/215 Pages) STMICROELECTRONICS

160 / 215 page

General purpose output (GPO) drivers

L9678P, L9678P-S

160/216

DS11626 Rev 9

General purpose output (GPO) drivers

The L9678P contains two GPO drivers configurable either as high-side or low-side modes,

controlled in ON-OFF mode or in PWM mode setting the desired duty cycle value through

the GPO Control Register (GPOCTRLx).

For low side driver configuration, the GPODx pin is the equivalent drain connection of the

internal MOSFET and it is the current sink for the output driver. The GPOSx pin is the

source connection of the GPO driver and is externally connected to ground.

Figure 54. GPO driver block diagram - LS configuration

For high side driver configuration, the GPODx pin will be connected to battery and GPOSx

pin will be connected to the load high side.

ERBOOST

GPODx

GPOSx

Vref

Vin

2V5

10bits

Sel GPODx

Current limitation

VBatt

22nF

LOAD

Current

sense

PWM_CLK (125us )

Driver with

Slew Rate

Control

PWM

CTL

OUT

CTL

GPOFLTSR (GPOxDISABLE )

GPOCTRLx [ 5:0]

GPOCR(GPOxLS )

ERBOOST_OK

SET

CL R

SPI(WID=’GPOCR’ )

SSM_RESET

Temperature

sensor

Tjsd

SET

CL R

SET

CL R

GPOCTRLx [5:0]=0h

SSM_RESET

GPOFLTSR (GPOxTEMP )

SET

CL R

SET

CL R

SSM_RESET

SPI(RID=’GPOFLTSR’ )

Iopenload

Ilim

GPOFLTSR (GPOxOPN )

GPOFLTSR (GPOxLIM )

GAPGPS01653

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