L9780 datasheet(34/56 Pages) STMICROELECTRONICS

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Digital interface description

L9780

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DocID026356 Rev 3

If the device receives an SPI command in order to modify VCCSEN bit in the middle of a

measurement cycle, it stores the new information and applies it at the beginning of the new

measurement cycle. VCCSEN bit value reported in the output register is the value used in

the last measurement cycle.

Refer to INRCPD bit description to define VCCS and INRC pull-down current switch on

sequence.

Refer to VCCSPD bit description to define VCCS and VCCS pull-down resistor switch on

sequence.

For correct use of this bit, refer also to Section 5.5.3.

Default state for this bit after power on reset: 0.

Bit 53: VCCSOUT

This bit selects VCCS output channel (and corresponding TG pin) as follows:

VCCSOUT=’0’ => selected channel 1;

VCCSOUT=’1’ => selected channel 2.

If the device receives an SPI command in order to modify VCCSOUT bit in the middle of a

measurement cycle while VCCS is disabled, it stores the new information and applies it at

the beginning of the new measurement cycle. VCCSOUT bit value reported in the output

For correct use of this bit, refer also to Section 5.5.3.

Default state for this bit after power on reset: 0.

Bit 52: VCCSPD

This bit enables (VCCSPD=’1’) or disables (VCCSPD=’0’) VCCS pull-down resistor on

OUT1 pin.

If the device receives an SPI command in order to modify VCCSPD bit in the middle of a

measurement cycle, it stores the new information and applies it at the beginning of the new

measurement cycle. VCCSPD bit value reported in the output register is the value used in

the last measurement cycle.

If the device receives an SPI command in order to modify VCCSPD and VCCSEN bits at the

same time, it will perform these two actions in sequence, with a delay between the two

events. In particular if in the input frame VCCSPD=’0’ and VCCSEN =’1’, the device disables

VCCS pull-down before enabling VCCS, viceversa if in the input frame VCCSPD=’1’ and

VCCSEN =’0’, the device disables VCCS before enabling VCCS pull-down resistor.

For correct use of this bit, refer also to Section 5.5.3.

Default state for this bit after power on reset: 1.

Bit 51: COMPSEL

This bit selects the output compensation network as follows:

COMPSEL=’0’ => selected channel A;

COMPSEL=’1’ => selected channel B.

If the device receives an SPI command in order to modify COMPSEL bit in the middle of a

measurement cycle while VCCS is disabled, it stores the new information and applies it at

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