L9780 datasheet(30/56 Pages) STMICROELECTRONICS

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Diagnostic

L9780

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DocID026356 Rev 3

5.5.2

SPI length fault

Receiving an SPI frame with a length different from [64 + (n*8)] bits is considered an SPI

length fault, immediately detected and validated.

Actions

Once an SPI length fault is validated the following actions are taken:

Ignore the corrupted message;

Assert SPIF1 and de assert SPIF2 bits in the output register; these bits are latched until

cleared by CLEARFLT;

Set REG bit to ‘0’.

5.5.3

SPI not valid command fault

Any of the following conditions is considered an SPI not valid command fault:

SPI frame with INRCPD = VCCSEN = 1;

SPI frame with VCCSPD = VCCSEN = 1;

When VCCS is enabled, the SPI frame modifies VCCSOUT, COMPSEL or

VCCSCAP[5..0] bit status;

When VCCS and clamp are enabled, the SPI frame modifies CLAMPCL or CLAMPSIM

bit status.

The fault is validated immediately.

Actions

Once an SPI not valid command fault is validated the following actions are taken:

Ignore the corrupted message;

Assert and latch SPIF1 and de assert SPIF2 bits in the output register; these bits are

latched until cleared by CLEARFLT;

Set REG bit to ‘0’.

5.6

Loss of ground

L9780 has no loss of ground detection. If one of the grounds exceeds the power on reset

voltage threshold, the device enters the reset condition. For detailed description see

Section 4.4.

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