L9779WD datasheet(104/170 Pages) STMICROELECTRONICS

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Functional description

L9779WD

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DocID027452 Rev 5

Figure 66. Adaptive filter function when the MSC bit are 00 or 01

Software option configuration requirement for VRS function:

By MSC command it is possible to configure different options of the VRS function:

–

The hysteresis changing is driven by a feedback signal coming from COMP output

OR from adaptive filter

–

The adaptive filter can be either on the rising edge or on both edges of the VRS

output.

Table 46. MSC command possible configuration of different option of VRS function

MSC Bit

11(1)

Function

Feed back from

COMP output.

VRS input signal from

low to high, add 1/

32* Tn filter time.

VRS output from high

to low with 1/32 * Tn

masking time.

Feed back from after

adaptive filter block

instead of from

COMP output

(specifically as

shown in Figure 67)

VRS output signal

from low to high, add

1/32 * Tn filter tune.

VRS output from high

to low with 1/32 * Tn

masking time.

VRS input signal from

high to low, add 1/

32* Tn filter time.

VRS output from high

to low with 1/32 * Tn

filter time.

Realize 01 and 10 functions

Feed back from after

adaptive filter block instead of

from COMP output. VRS

output signal from low to

high, add

1/ 32* Tn filter time. VRS

output from high to low with

1/32 * Tn filter time. Feed

back from after adaptive filter

block instead of from COM

output. VRS output signal

from low to high, add 1/32 *

Tn filter time. VRS output

from high to low with 1/32 *

Tn filter time.

1. If MSC CONFIG_REG7-bit4 is set (High) VRS filter time is fixed to 4 µs ±1.25 µs.

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