L7200

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BIT

LABEL

DESCRIPTION

5

RETDIR

Retract Direction.

“0” VCM- high, VCM+ low. “1” VCM- low, VCM+ high.

6

RETRACT

“1” Retracts the Voice Coil arm.

7

RETBRK

“1” Brakes the VCM for the first 20mS of the retract time then it reverses

the direction of the retract opposite to the RETDIR bit setting for other

20mS, then it finish the normal retract. This total 40mS are

subtructed from the programmed Retract time.

Reg:

13

Name:

Voice Coil Set-Up and Ramp Loading Register

Type:

Write only

Address: DEh

BIT

LABEL

DESCRIPTION

0

VCMCAL0

VCM Calibration. First Bit.

Bit 3

Bit2

Bit 1

Bit 0

Adj

1

VCMCAL1

VCM Calibration. Second Bit.

0

0

0

0

None

2

VCMCAL2

VCM Calibration. Third Bit.

0

0

0

1

1.4mV

3

VCMCAL3

VCM Calibration. Fourth Bit.

0

0

1

0

2.8mV

00

1

1

4.2mV

01

0

0

5.6mV

01

0

1

7.0mV

01

1

0

8.4mV

01

1

1

9.8mV

10

0

0

11.2mV

10

0

1

12.6mV

10

1

0

14.0mV

10

1

1

15.4mV

11

0

0

16.8mV

11

0

1

18.2mV

11

1

0

19.6mV

11

1

1

21.0mV

4

VCMCALDIR

VCM Calibration Direction. “0” Positive offset. “1” Negative offset.

5

RAMPLOADING

VCM Ramp Loading Setting. “1” Ramp Loading mode.

6

SAMPLE/HOLD

VCM Ramp Loading Setting. “0” Hold. “1” Sampling.

7

TRISTATE

VCM Ramp Loading Setting. “1” Synchronusly clamps the VCM outputs until

current is less than 100mA, then tristate them.

INTERNAL REGISTERS DEFINITION (continued)