L99ASC03 datasheet(55/73 Pages) STMICROELECTRONICS

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L99ASC03

ST-SPI Protocol

4.4.3

Device Control Register 2

Address:

0x2

Type:

R/W

Description:

In this register static BEMF parameters and the drain-source monitoring parameters

are set.

Bit name

BEMFCM

BEMFDIR

BEMFMOD

BEMFPOL

BEMFSW

DSMFBT

DSMTH(1)

DSMTH(0)

Default values

Bit Bit description

[7] BEMFCM: BEMFCNT updating source selection

0: The BEMFCNT can be updated only via SPI

1: The BEMFCNT can be updated only via positive pulses applied at the BC input pin

[6] BEMFDIR: BEMFCNT update direction (active only if BEMFCM = 1)

0: BEMFCNT increased at each positive pulse at the BC input pin

1: BEMFCNT decreased at each positive pulse at the BC input pin

[5] BEMFMOD: BEMF comparator selection

0: BEMF GND comparator (if BEMFSW = 0) used for BEMF detection

0: BEMF

VSMS comparator (if BEMFSW = 1) used for BEMF detection

1: BEMF

VSMS/2 comparator used for BEMF detection

[4] BEMFPOL: BEMF sampling point selection (active only if BEMFMOD=0)

0: BEMF detection upon turn-on of the PWM switch

1: BEMF detection upon turn-off of the complementary PWM switch

[3] BEMFSW: PWM switching method to drive the external MOSFET in a half bridge

0: PWM signal applied on HS

1: PWM signal applied on LS

[2] DSMFBT: drain-source monitoring filter and blanking time

0: 1.2 µs blanking and filter time selected

1: 2.4 µs blanking and filter time selected

[1:0] DSMTH: Drain Source Monitor threshold

00: 0.5 V

01: 1.0 V

10: 1.5 V

11: 2.0 V

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