L9907 datasheet(33/49 Pages) STMICROELECTRONICS

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DS11800 Rev 5

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L9907

SPI operation

SC_HS1 and SC_HS0 (B5-B4) are used to select short circuit detection threshold

for high-side external MOSFET ('00' default condition at Power Up):

Table 30. Short circuit detection threshold for low-side external MOSFET

Note:

The accuracy in ranges in Table 30 is valid for VB > 6 V. For VB < 6 V the accuracy is 22.5%

for each configuration.

VBOV2 and VBOV1 (B3-B2) are used to select over voltage threshold for single or

double battery application

Table 31. VB over voltage threshold for single or double battery application

The power-up default value for this parameter is "01", corresponding to double battery

applications.

A SPI command attempting to set a not allowed VBOV configuration does not return any SPI

error, and the VBOV configuration register retains its previous value.

EN_THSD, EN_VBOV EN_VBUV (B12,B9,B8) are used to enable/disable effect

of Thermal Shut Down, VB overvoltage, VB Under Voltage faults respectively.

Default value is '1' for all of them, that means "fault effect is enabled".

VCCOV2 and VCCOV1 (B1-B0) are used to select the VCC over voltage thresholds:

VSC_HS

B5 = SC_HS1

B4 = SC_HS0

0.4 – 0.6 V

0.7 – 0.9 V

0.9 – 1.1 V

1.17 – 1.43 V

VBOV

B3 = VBOV2

B2 = VBOV1 (1)

1. For power supply configuration in 48 V domain, please refer to AN5124.

27.5 – 34.5 V

36 – 42 V (Default)

Not Allowed

Table 32. CMD1 SDI SPI bits vs. enabled fault

CMD1 SDI SPI BIT

Name

Description (Default value=’1’)

B12

EN_THSD

It enables Thermal shut down fault effect in case of THSD fault detection

EN_VBOV

It enables VBOV fault effect in case of VBOV fault detection

EN_VBUV

It enables VBUV fault effect in case of VBUV fault detection

Table 33. VCC over voltage threshold

VCCOV

B1 = VCCOV2

B0 = VCCOV1

3.3 V (default)

5.0 V

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