L9301 datasheet(29/51 Pages) STMICROELECTRONICS

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L9301

Low side driver

9.3

Driver diagnostic

9.3.1

Thermal protection

Each solenoid channel has a dedicated temperature sensor that continuously monitors the

temperature of the power MOS.

In case the temperature shut down is reached the related channel is turned off and the

dedicated diagnostic bits are set. t_sdl_x is the bit that latches the thermal shut down and it

is cleared after SPI read, t_sd_x is the other thermal shut down bit and once it is set by

thermal shut down condition it is cleared only when the Tj decreases below the thermal shut

down threshold (hysteresis). If the microcontroller, when the device is still in temperature

shut down condition (t_sd_x = 1), clears the t_sdl_x and tries to turn on the output, the

actuation will not be performed and the t_sdl_x will be set again. To avoid these multiple

interrupts the microcontroller can poll the t_sd_x bit and enable the next actuation only when

the bit is zero.

9.3.2

Overcurrent protection

An overcurrent protection is present for each driver OUT1...8. The overcurrent threshold is

selectable through oc_thres_x (where x indicates the channel). In case of overcurrent the

output driver is turned off, the related SPI command bit is set to 0 and a dedicated

diagnostic bit is set oc_x, where x indicates the channel where the fault occurred.

If bit oc_restart = 0, to restart the channel the microcontroller has to clear the fault bit

(reading the fault register), and to write to 1 the SPI command bit or to provide a rising edge

on the parallel input command.

If bit oc_restart = 1, the restart function is activated. The slew rate of the channel in fault

condition is automatically set to the higher value to limit dissipation issue then to restart the

channel the microcontroller has to write to 1 the SPI command bit or to provide a rising edge

on the parallel input command. The diagnostic bit oc_x can be cleared only by writing it to 0

in the corresponding driver status register by SPI however the channel can be restarted as

described above.

9.3.3

Output status

During the ON phase, the output voltage is compared with the VTopen threshold voltage in

order to verify if the output status is aligned with the ON command. If the OUTx voltage is

above the VTopen threshold a dedicated bit is set to indicate the anomaly.

OUT5-8

EclampSP_LS

Clamp repetitive

pulse energy ATE

test

LS configuration

I_load = 2.2 A, Tj = 150 °C,

100 kpulses

EclampSP_LS

Clamp single pulse

energy ATE test

LS configuration

I_load = 2.2 A, Tj = 150 °C

18.1

Table 19. Low-side drivers OUT5-8 electrical characteristics (continued)

Symbol

Parameter

Test condition

Min.

Typ.

Max.

Unit

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