L9907 datasheet(30/49 Pages) STMICROELECTRONICS

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SPI operation

L9907

30/49

DS11800 Rev 5

4.1

SPI bits mapping

The L9907 provides the instructions to decide which kind of strategy to adopt for faults

managing: the strategy can be selected by toggling the enable fault flags available in CMD4

and CMD1 registers.

When a fault has been validated, the corresponding diagnostic flag is set and FS_FLAG is

asserted low. The device can perform shut-off or take no action depending on the value of

the enable fault flag.

In the case where shut-off for a fault is disabled, micro becomes fully responsible for the

shut-off management for the disabled fault.

As default value, all the enable fault flags are asserted high, so the device will take the

actions described in the section related to each of them.

SDO rise/fall time (tSDO-rise, tSDO-fall)

Cload < 60 pF

@ fSCK =8 MHz

-35-

tCS-select

tCS-access

tCS-negated

3.58

640

µs

SDO Access Time (ta)11

Table 22. SPI timing specifications (continued)

Parameter

Condition

Min.

Typ.

Max.

Unit

Table 23. SDI bit map definition

Item B15 B14 B13 B12 B11 B10 B9

AND (EN1,

EN2)

CMD0

Par

DT1

DT0IG_1

IG_0G21

G20

Off2

G11

G10

Off1

CMD1

Par

CMD2

Par

CMD3

Par

CMD4

Par

DIAG

Par

DIAG2

Par

1. Writable only if AND(EN1,EN2) low else command ignored.

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