L9780 datasheet(41/56 Pages) STMICROELECTRONICS

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L9780

Digital interface description

STGSNS=’1’ => short to ground detected.

For detailed description of the fault detection refer to Section 5.2.

Bit 14: CLAMP

This bit indicates the activation of VCCS clamp as follows:

CLAMP=’0’ => no activation;

CLAMP=’1’ => clamp activated.

For detailed description of the analog circuitry refer to Section 4.9.

Bit 13: OCH

This bit represents the heater open circuit condition as follows:

OCH=’0’ => no fault;

OCH=’1’ => heater open circuit.

If the device detects a heater open circuit and then a short to ground condition without any

fault clear frame between these 2 events, both OCH and STGH bits can be =’1’ in SPI

output frame.

For detailed description of the fault detection refer to Section 5.4.3.

Bit 12: STBH

This bit represents the heater short to battery condition as follows:

STBH=’0’ => no fault;

STBH=’1’ => heater short to battery.

For detailed description of the fault detection refer to sSection 5.4.1.

Bit 11: STGH

This bit represents the heater short to ground condition as follows:

STGH=’0’ => no fault;

STGH=’1’ => heater short to ground.

For detailed description of the fault detection refer to Section 5.4.2.

Bit 10: STGRC

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

STGRC=’0’ => no fault;

STGRC=’1’ => short to ground detected.

For detailed description of the fault detection refer to Section 5.2

Bit 9 - 0: RCIMP2_[9..0]

10 bit A/D conversion of the output of RCT2 amplifier while RCT1 switch is active. For

detailed description of the timing sequence refer to Section 4.12.

L9780 Datasheet(PDF) 41 Page - STMicroelectronics