INTERNAL REGISTER DEFINITION

VCM DAC (High and Low) Registers

Bit 0 through 5 of the VCM DAC (High) Registers and bit 0 through 7 of the VCM DAC (Low) Registers

control the absolute value of the voice coil current. Bit is the sign bit, controlling the current direction. All

the 13 bits are part of a resistor divider network.

Note. It is required to write on register 1 to make effective changes on register 0.

Reg:

Name:

Type:

Address:

1

VCM DAC (Low) Registers

Write only

1Eh

BIT

LABEL

DESCRIPTION

0

VDAC BIT0

LSB resistor ladder of the 14 bit VCM DAC

1

VDAC BIT1

VCM DAC bit 1

2

VDAC BIT2

VCM DAC bit2

3

VDAC BIT3

VCM DAC bit3

4

VDAC BIT4

VCM DAC bit4

5

VDAC BIT5

VCM DAC bit5

6

VDAC BIT6

VCM DAC bit6

7

VDAC BIT7

VCM DAC bit7

Reg:

Name:

Type:

Address:

2

Spindle Control Register

Write only

2Eh

BIT

LABEL

DESCRIPTION

0

INCRE_SEQ

A 0 to 1 transition of this bit increments the spindle Sequencer.

1

START_UP

1 = Spindle Internal start up, 0 = Spindle External start up

2

R_SEQ

Reset Spindle sequencer. 1 = Reset sequencer to phase 1.

3

RUN

1 = Start Spindle ALIGN & GO, 0 = Reset Spindle control logic.

4

SPIN_EN

Enable Spindle section. 1 = Enable, 0 = Disable.

5

MEC/ELEC

Specifies electrical or mechanical cycle for Spindle FLL control.

1=Electrical, 0 = Mechanical.

6

PWM/LINEAR

Selects Spindle PWM or Linear Output Current Control. 1 = PWM,

0=Linear.

7

EXT/INT

External or internal Spindle loop feedback. 1 = external feedback

via index pin.

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