L9788 datasheet(85/264 Pages) STMICROELECTRONICS

85 / 264 page

DS12308 Rev 4

85/264

L9788

Low-side drivers

263

Figure 30. Low-side driver OFF state diagnosis schematic

In the Low-Side Driver we can have three different load conditions as shown in Figure 31:

Figure 31. Low-side driver OFF state diagnosis load thresholds

_Normal Load: it means output driver connected to the load, No Fault Present, VOUT ≥

V_OL Threshold

_Open Load: It means output driver disconnected from the load, Open Load Fault Present,

VLVT ≤ VOUT ≤ V_OL Threshold

_Short To Ground: it means output driver shorted to GND voltage, Short To Gnd Fault

Present, VOUT ≤ VLVT Threshold

There is a bit IPUPD_EN in CONFIG_REG2 which is controlled by a MSC bit, that it is used

by external µController if it is needed to switch on/off both pull up and pull down diagnosis

current.

GADG0112161144PS

PGND

OUTx

LowSide DRIVER

LOAD L/R

MSC Command

Driver

VBAT

I_LS_PU

VOUTOPEN

VTOPEN

Vdd

Fast Pull Up

VTGND

DIAGLV

DIAGOL

I_LS_PD

GADG0112161201PS

Short to

GND

Open Load

Normal

function

VOUTOPEN

VOUTOPEN max

VOUTOPENmin

1.9V

V_OUTx

(low-side)

V_OLmin

VLVTmax

Open Load

Short to

GND

Normal

function

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