L9300 datasheet(64/178 Pages) STMICROELECTRONICS

64 / 178 page

10.1.3

Solenoid driver error handling

Table 38. Solenoid driver error handling

Type of error

Detection

condition

Action

Clear

SPI flag

Restart condition

HS Overcurrent

Solenoid in PWM

mode or full on

mode, HS on

HW mode: Solenoid channel set in tristate, current set-

point set to 0. HS over current bit (2) set in

Exceptions register. SW mode: same as HW mode if

OVC_R bit is set to 0, otherwise only the fault is

latched and the channel is kept enabled and

reactivated at next PWM edge

On read

Clear the fault via SPI and set

DRVENAx bit in

SolEnDRVregister

LS Overcurrent

Solenoid in PWM

mode or full on

mode, HS on

HW mode: Solenoid channel set in tristate, current set-

point set to 0. LS over current bit (1) set in

Exceptions register. SW mode: same as HW mode if

OVC_R bit is set to 0, otherwise only the fault is

latched and the channel is kept enabled and

reactivated at next PWM edge

On read

Clear the fault via SPI and set

DRVENAx bit in

SolEnDRVregister

Overvoltage, clamp

activation

On state

Driver set to tristate mode, LS_CLAMP_ACT SPI fault

(3) latched in Exceptions register

On read

Clear the fault via SPI and set

DRVENAx bit in

SolEnDRVregister

Short to ground

(LVT)

Solenoid in tristate

mode, diagnostic

enabled

Short Detection fault bit (5) latched in Exceptions

On read N. D.

Open load (OPL)

Solenoid in tristate

mode, diagnostic

enabled

Open Load fault bit (6) latched in Exceptions register

On read N. D.

Overtemperature

Warning

On state

T_WARN SPI fault (15) latched in Exceptions register

On read N. D.

Overtemperature

Shutdown

On state

Solenoid channel set in tristate, current set-point

set to 0. T_SD SPI fault (0) latched in Exceptions

On read

Clear the fault via SPI and set

DRVENAx bit in

SolEnDRVregister

10.2

Fail-safe pre-driver

10.2.1

Fail-safe pre-driver functional description

For safety purpose the solenoid loads may be connected to battery line through an external fail-safe switch driven

by the device: in case of fault the device should be able to switch-off external fail-safe switch to avoid unwanted

energization of solenoid loads.

The turning ON and OFF command has to be delivered through SPI communication.

L9300

Valve drivers

DS12258 - Rev 5

page 64/178

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