L6268 データシートの表示（PDF） - STMicroelectronics

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L6268

12V DISK DRIVE SPINDLE & VCM, POWER & CONTROL “COMBO”

STMicroelectronics 

L6268

INTERNAL REGISTER DEFINITION

Reg:

Name:

Type:

Address:

3

Spindle Delay Register

Write only

3Eh

BIT

0

1

2

LABEL

MASK_TIME

MIN2

MIN1

3

8_12_POLE

4

SD3

5

SD2

6

SD1

7

SD0

DESCRIPTION

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

Control Spindle PWM on time Min 1 Min2 Min. on Time

0

0

5.9µs

0

1

1.4µs

1

0

12µs

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

Spindle commutation delay MSB

Spindle commutation delay bit

Spindle commutation delay bit

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

0

C4

1

C5

2

C6

3

C7

4

C8

5

C9

6

C10

7

C11

LABEL

DESCRIPTION

Bit 4 of Spindle FLL Coarse Counter

Bit 5 of Spindle FLL Coarse Counter

Bit 6 of Spindle FLL Coarse Counter

Bit 7 of Spindle FLL Coarse Counter

Bit 8 of Spindle FLL Coarse Counter

Bit 9 of Spindle FLL Coarse Counter

Bit 10 of Spindle FLL Coarse Counter

MSB of Spindle FLL Coarse Counter

10/17

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