L9780 datasheet(40/56 Pages) STMICROELECTRONICS

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Digital interface description

L9780

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DocID026356 Rev 3

Bit 57 - 48: RCAMP[9..0]

10 bit A/D conversion of the output of INRC amplifier. For detailed description of the timing

sequence refer to Section 4.12.

Bit 47 - 45: COUNT[2..0]

3 bit measurement counter. For detailed description of the timing sequence refer to Section 4.12.

Bit 44 - 42: STBS[3..1]

These bits represent the sensor short to battery condition as follows:

STBS=’0’ => no fault;

STBS=’1’ => short to battery detected.

with the following association:

STBS1 => short to battery detected on SR pin;

STBS2 => short to battery detected on INRC pin;

STBS3 => short to battery detected on SNS, OUT or TG pins.

For detailed description of the fault detection refer to section Section 5.1.

Bit 41 - 32: FV[9..0]

10 bit A/D conversion of FV pin voltage. For detailed description of the timing sequence

refer to Section 4.12.

Bit 31 - 30: CB[1..0]

These are confirmation bits and their values is fixed, CB1=’1’, CB0=’0’; these bits can be

used by the μP to detect SPI data faults.

Bit 29 - 28: SPIF[1..2]

These bits indicate the presence of an SPI data fault, as described in the following table:

Bit 27 - 26:

Bits not used.

Bit 25 - 16: RCIMP1_[9..0]

10 bit A/D conversion of the output of RCT2 amplifier before the activation of RCT1 switch.

For detailed description of the timing sequence refer to Section 4.12.

Bit 15: STGSNS

This bit represents the sensor short to ground condition on SNS pin as follows:

STGSNS=’0’ => no fault;

Table 8. SPI data fault

SPIF1

SPIF2

Description

No fault

SPI fault: SPI length error / data fault (CB error)

SPI fault: illegal SPI command

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