L9907 datasheet(32/49 Pages) STMICROELECTRONICS

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SPI operation

L9907

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DS11800 Rev 5

Off2 (B3) is used to select current sense amplifier 2 offset (for ground or phase

connection): '0' (default value) means ground, '1' means phase.

G11 and G10 (B2,B1) are used to select Current sense amplifier 1 Gain:('00'

default condition at Power-On Reset)

Off1 (B0) is used to select current sense amplifier 1 offset (for ground or phase

connection): '0' (default value) means ground, '1' means phase.

CMD1 register - Diagnostic settings: B(15:13) = 001

In order to avoid unsafe change of diagnostic settings, it is not possible to write the CMD1

signal EN1 or EN2 must be deasserted in order to update the CMD1 register. If EN1 and

EN2 are both asserted while a SPI cycle CMD1 with WE=1 is ongoing, then a SPI

communication error is generated and the corresponding SPI command is ignored.

Since the Enable signals EN1 and EN2 also affect the output gate drives, a deglitch filter is

implemented on both of them. This filter is active on either falling edge of EN1 or EN2

signal.

In order to avoid unsafe change of fault management settings, as for the CMD1 register, it is

not possible to write CMD4 register during normal Output Gate Drive operation. For this

reason at least one Enable signal EN1 or EN2 must be deasserted in order to update the

If EN1 and EN2 are both asserted while a SPI cycle CMD4 or CMD1 with WE=1 is ongoing,

then a SPI communication error is generated and the corresponding SPI command is

ignored.

SC_LS1 and SC_LS0 (B7,B6) are used to select short circuit detection threshold

for low-side external MOSFET ('00' default condition at power up):

Note:

The accuracy in ranges in Table 29 is valid for VB > 6 V. For VB < 6 V the accuracy is 22.5%

for each configuration.

Table 28. Current sense amplifier 1 gain

Gain

B2 = G11

B1 = G10

100

Table 29. Short circuit detection threshold for low-side external MOSFET

VSC_LS

B7 = SC_LS1

B6 = SC_LS0

0.4 – 0.6 V

0.7 – 0.9 V

0.9 – 1.1 V

1.17 – 1.43 V

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