L99ASC03 datasheet(56/73 Pages) STMICROELECTRONICS

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ST-SPI Protocol

L99ASC03

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DocID023504 Rev 7

4.4.4

Device Control Register 3

Address:

0x3

Type:

R/W

Description:

In this register, dynamic BEMF parameters are set.

Bit name

BEMFSIGN

BEMFOS(2)

BEMFOS(1)

BEMFOS(0)

BEMFBY

BEMFCNT(2)

BEMFCNT(1)

BEMFCNT(0)

Default values

Bit Bit description

[7] BEMFSIGN: offset sign for BEMF

VSMS/2 comparator

0: threshold of BEMF

VSMS/2 comparator increased by offset

1: threshold of BEMF

VSMS/2 comparator decreased by offset

[6:4] BEMFOS: Offset Selection for BEMF

VSMS/2 comparator

000: BEMF offset = 0 V

001: BEMF offset = 0.0025 *

VSMS

010: BEMF offset = 0.005 *

VSMS

011: BEMF offset = 0.01 *

VSMS

100: BEMF offset = 0.02 *

VSMS

101: BEMF offset = 0.04 *

VSMS

110: BEMF offset = 0.08 *

VSMS

111: BEMF offset = 0.16 *

VSMS

[3] BEMFBY: BEMF comparator output sampling source selection

0: BEMF comparator output sampled on PWM edge, depending on BEMFMOD, BEMFPOL and

BEMFSW

1: BEMF comparator output sampled by internal system clock

[2:0] BEMFCNT: BEMF motor-phase/step counter (see Figure 25)

Step

Switch where

PWM is applied

Switch always on

BEMF monitored

at pin

000

Not used (phase multiplexer is OFF)

001

GH1 or GL1

GL2 or GH2

SH3

010

GH1 or GL1

GL3 or GH3

SH2

011

GH2 or GL2

GL3 or GH3

SH1

100

GH2 or GL2

GL1 or GH1

SH3

101

GH3 or GL3

GL1 or GH1

SH2

110

GH3 or GL3

GL2 or GH2

SH1

111

Not used (phase multiplexer is OFF)

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