L9300 datasheet(62/182 Pages) STMICROELECTRONICS

62 / 182 page

By default diagnostic pull up/down currents are disabled and comparator outputs are masked by internal logic, to

enable OFF state diagnostic the channel must be put first in tristate condition and then (if not already done with

previous SPI frames) diagnostic must be enabled. Once the desired channel is put in tristate a false diagnostic

can be sensed due to the time needed to discharge output voltage through the load. To avoid unwanted fault

detection a blanking time is implemented: during this time diagnostic comparators are masked. The diagnostic

blanking time is programmable through SPI to choose the proper value depending on external load value and

ESD capacitor connected to the output pin. Fault conditions are latched and cleared on SPI read, however they

do not prevent enabling of the solenoid channels.

OFF state diagnostic comparators are the same for both HS and LS configuration and their output is decoded

from internal logic to set SPI fault bits according to the following figure:

Figure 36. LS configuration diagnostic

GADG2709181312PS

HS GATE

DRIVER

off state

LS GATE

DRIVER

off state

VTOPEN

I_LS_PU

I_LS_PD

LOADx

RETURNx

VSx

LOAD

VTGND

DIAGOL

DIAGLV

VOUTOPEN

–

Table 35. LS diagnostic truth table

Comparator Output

FAULT DETECTION

Exception Registers [6:5]

DIAGOL

DIAGLV

OPEN LOAD

SHORT

Normal operation – no fault-

Not possible

Open load

Short to ground

L9300

Solenoid driver

DS12258 - Rev 4

page 62/182

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