L9907 datasheet(40/49 Pages) STMICROELECTRONICS

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SPI operation

L9907

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DS11800 Rev 5

SDO DIAG2 register - Diagnostic read cycle: B(15:13) = 111

Below, it is described the meaning of each diagnostic bit in case of DIAG2 active.

SDO bit B9: BST_DIS_RB

BST_DIS_RB informs about the status of that a BST_DIS pin (not cleared after

read).

SDO bit B8: EN1_RB

EN1_RB informs about the status of EN1 filtered input (not cleared after read).

SDO bit B7: AND(EN1,EN2)_RB

AND(EN1,EN2)_RB informs about the status of AND(EN1,EN2) signal (not

cleared after read).

SDO bit B6: REGOFF_RB

REGOFF_RB informs that a REG_OFF procedure has been triggered by EN1

lowering. Reading back this bit will re-engage FS_FLAG and cause

REG_OFF='0'.

SDO bit B5: BST_C_OV

BST_C_OV informs about the status of boost over voltage level.

Filter time duration:

16*tosc ≤ TFILT ≤ 20*tosc (active on both directions)

effect when validated: BST_CLK = 0, BST_EN = 1,

BST_HYST = 1, FS_FLAG = 0; EN_PWM[3:1] no change

re-engagement:

BST_CLK self re-engagement when fault disappears

FS_FLAG re-engaged after DIAG2 reading and fault cleared

SDO bit B4: GCR_OL

GCR_OL informs about the status of the GCR pin open load condition (i.e. too

high resistive value).

Filter time duration: 16*tosc ≤ TFILT ≤ 20*tosc (active on both directions)

effect when validated:GCR_INT_I = 1

re-engagement:

GCR_INT_I = 0 self re-engagement when fault disappears

FS_FLAG re-engaged after DIAG2 reading and fault cleared

SDO bit B3: GCR_STG

GCR_STG informs about the status of the GCR pin short to ground condition (i.e.

too low resistive value).

Filter time duration: 16*tosc ≤ TFILT ≤ 20*tosc (active on both directions)

effect when validated:GCR_INT_I = 1

re-engagement:

GCR_INT_I = 0 self re-engagement when fault disappears

FS_FLAG re-engaged after DIAG2 reading and fault cleared

SDO bit B<2:0>: SHT<X>

Shoot Through on specific phase has occurred: FS_FLAG remains low till the fault

is cleared by a read back of DIAG2 frame.

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