L7250 datasheet(17/46 Pages) STMICROELECTRONICS

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L7250

Table 2. Register map content description (continued)

Bit

SPI field name

Content

[2:0]

Rev[2:0]

Revision number of the device, set internally

[3]

ThWarn

Thermal warning

[4]

ThShutdown

Thermal shutdown

[5]

ZCbad

Signals a problem with spindle speed loop synchronism

[6]

VCMcalOut

VCM error output in calibration mode

[7]

SPNCurrSign

Spindle current sign to implement adaptive torque optimizer

control

[0]

NoBrake

0=VCM active brake phase enabled

1= VCM active brake phase disabled

[3:1]

Rltimer[2:0]

000 = only Unload1 is enabled

001 = threshold set to 0.4V

010 = threshold set to 0.8V

011 = threshold set to 1.2V

100 = threshold set to 1.6V

101 = threshold set to 2V

110 = threshold set to 2.4V

111 = only Unload2 is enabled

[5:4]

Rlvoltage2[1:0]

Selects between 4 values of unload voltage in Unload2 phase:

00 = 1V

01 = 1.125V

10 = 1.250V

11 = 1.375V

[7:6]

Rlvoltage1[1:0]

Selects between 4 values of unload voltage in Unload1 phase:

00 = 0.375V

01 = 0.5V

10 = 0.625V

11 = 0.75V

[3:0]

Rlcalib[3:0]

0111 = 29.4%

0110 = 25.2%

0101 = 21%

0100 = 16.8%

0011 = 12.6%

0010 = 8.4%

0001 = 4.2%

0000 = 0%

1111 = -4.2%

1110 = -8.4%

1101 = -12.6%

1100 = -16.8%

1011 = -21%

1010 = -25.2%

1001 = -29.4%

1000 = -33.6%

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