L9301 datasheet(28/54 Pages) STMICROELECTRONICS

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Low side driver

L9301

28/54

DS11400 Rev 9

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 is not 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.

To re-switch on the channel after thermal shut down, the SPI needed to switch off the

channel is required.

9.3.2

Overcurrent protection

An overcurrent protection is present for each driver OUT1-8 and DRN/SRC1...4. The

overcurrent threshold is selectable through oc_thres_x (where x indicates the channel). In

case of overcurrent the output driver is turned off 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 (writing

0 in the corresponding SPI flag), 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:



in case of low side usage if the DRNx voltage is above the VTopen threshold a

dedicated bit (SRx: bit 8 os) is set to indicate the anomaly



in case of high side usage if the SRCx voltage is below the VTopen threshold a

dedicated bit is (SRx: bit 8 os) set to indicate the anomaly



if OUTx voltage is above VTopen threshold a dedicated bit (SRx: bit 8 os) is set to

indicate the anomaly

9.3.4

Charge Pump (CP)

The charge pump is enabled when the selected configuration includes high side drivers (like

configuration 2, 3, 4). In configuration 1 the charge pump is internally shorted to VB.

On the CP pin it's required to connect a 100 nF capacitor toward the VB line.

The charge pump is ON if VB > UV threshold & VDD > UV threshold

The charge pump is OFF if VB< UV threshold or VDD< UV threshold. The CP voltage is

equal to VB-Vbe.

When the CP is ON, the low CP diagnosis is enabled. When any HS is switched on but CP

voltage is not high enough to switch on HS, low CP fault is detected and stored in cpl SPI

flag. In order to reset the flag a 0 has to be written by microcontroller. A SPI bit allows

configuring the actions to be taken in case of low CP fault.

5 V ≤ VB < 18 V; -40 °C ≤ Tj ≤ 175 °C unless otherwise specified.

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