L7250 datasheet(18/46 Pages) STMICROELECTRONICS

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L7250

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[5:4]

RLToffBrake[1:0]

Selects the duration of Toff (Ton) active brake phase:

00 = 300usec

01 = 400usec

10 = 500usec

11 = 600usec

[7]

SkockConf

Selects the Shock Sensor application

0 = piezo element

1 = charging element

[6]

SkockTh[0]

Selects the Shock Sensor threshold

0 = Vref +/- 200mV

1 = Vref +/- 500mV

[3:0]

Spstate[3:0]

0000 = CLCOAST

0001 = OLCOAST

0010 = OLSIX

0011 = OLSIN

0100 = OLBRAKE

0101 = INDSENSE

0110 = CLSIX

0111 = CLSIN

1000 = CLBRAKE

[6:4]

VCMstate[2:0]

Possible states for the VCM:

000 = Unload/Retract

001 = tri-state

010 = brake

011 = enable current mode

100 = enable voltage mode

101 = offset calibration

110 = confirm the previous state

111 = confirm the previous state

[7]

BemfOffCal

VCM BEMF processor offset calibration

[1:0]

PWMmask[1:0]

Selects the length of the mask over PWM rising edge:

00 = 2 us

01 = 4 us

10 = 6 us

11 = 8 us

[4:2]

Currdac[2:0]

Selects the voltage threshold for the spindle current limiter:

000 = 250mV

001 = 300mV

010 = 350mV

011 = 400mV

100 = 450mV

101 = 500mV

110 = 550mV

111 = 600mV

Table 2. Register map content description (continued)

Bit

SPI field name

Content

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