INTERNAL REGISTER DEFINITION

Reg:

Name:

Type:

Address:

3

Spindle Delay Register

Write only

3Eh

BIT

LABEL

DESCRIPTION

0

MASK_TIME

Spindle BEMF Mask Time. 0 = 15 degree, 1 = 7.5 degree

1

MIN2

Control Spindle PWM on time

Min 1

Min2

Min. on Time

0

0

5.9

µs

2

MIN1

0

1

1.4

µs

10

12

µs

3

8_12_POLE

Selects 8 or 12 pole motors. 1 = 8 pole, 0 = 12 pole.

4

SD3

Spindle commutation delay MSB

5

SD2

Spindle commutation delay bit

6

SD1

Spindle commutation delay bit

7

SD0

Spindle commutation delay LSB

SPINDLE PHASE DELAY

SD3-0 set the phase delay from BEMF zero crossing to the next commutation. The 30 theoretical degree

value can be changed to compensate for switching and other delays that are always present. The delay

adjustment range is from 1.875 through to 30 electrical degrees in 1.875 degree increments.

Reg:

Name:

Type:

Address:

4

FLL Coarse Counter Register

Write only

4Eh

BIT

LABEL

DESCRIPTION

0

C4

Bit 4 of Spindle FLL Coarse Counter

1

C5

Bit 5 of Spindle FLL Coarse Counter

2

C6

Bit 6 of Spindle FLL Coarse Counter

3

C7

Bit 7 of Spindle FLL Coarse Counter

4

C8

Bit 8 of Spindle FLL Coarse Counter

5

C9

Bit 9 of Spindle FLL Coarse Counter

6

C10

Bit 10 of Spindle FLL Coarse Counter

7

C11

MSB of Spindle FLL Coarse Counter

L6268

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