L7250 datasheet(19/46 Pages) STMICROELECTRONICS

19 / 46 page

19/46

L7250

[7:5]

Spslew[2:0]

000 = 10 V/us

001 = 20 V/us

010 = 30 V/us

011 = 40 V/us

100 = 50 V/us

101 = 60 V/us

110 = 70 V/us

111 = 80 V/us

[0]

Sken

0 = shock sensor output no latched

1 = shock sensor output latched (to clear the latched information

a transition 1 -> 0 -> 1 is necessary)

[1]

Vnegen

0 = negative regulator disabled

1 = negative regulator enabled

[2]

TSDen

0 = thermal shutdown disabled

1 = thermal shutdown enabled

[6:3]

M[3:0]

masking while sensing ZC, expressed in terms of half samples

after window opening

In terms of electrical degrees the single mask step is 3.75.

[7]

SPIprot

0 = default protocol

1 = inverted SCLK protocol

[0]

PREsmo

0 = spindle clock is system clock divided by two (FFWDADC clock

is system clock divided by 8)

1 = spindle clock is system clock (FFWDADC clock is system

clock divided by 4)

[2:1]

PREADC[1:0]

00 = sleep mode

01 = ADC clock is system clock divide by 4

10 = ADC clock is system clock divide by 2

11 = ADC clock is system clock

[7:3]

W[4:0]

Windowing while sensing ZC, expressed in terms of half samples

before TO value

In terms of electrical degrees the single window step is 3.75.

[4:0]

TO[4:0]

Coarse and fine section of phase shift, applied for torque

optimization.

In terms of electrical degrees the Torque Optimizer single step is

0.937 electrical degrees.

[5]

FFWEn

0 = power supply compensation for spindle disabled

1 = power supply compensation for spindle enabled

[6]

Advance

0->1 increments by one the current sample position

[7]

LoadCP

0->1 enables load of TO value as the current sample position

[7:0]

Kv[7:0]

KVAL factor for speed loop control

Table 2. Register map content description (continued)

Bit

SPI field name

Content

L7250 数据表(PDF) 19 Page - STMicroelectronics

L7250 数据表(HTML) 19 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46

数据表下载