L7200 查看數據表（PDF） - STMicroelectronics

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L7200

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

STMicroelectronics 

L7200

INTERNAL REGISTERS DEFINITION (continued)

Reg:

1

Name: Spindle Set-Up 0 Register

Type: Write only

Address: 1Eh

BIT

LABEL

0 SMOOTH

1 BIPMASK

2 MINON 0

3 MINON 1

4 BIPDELAY

5 MASKSPIN 0

6 MASKSPIN 1

7 FREEZE

DESCRIPTION

“0” Spindle SMOOTHDRIVE™. “1” Spindle Six step drive.

Spindle Mask Time. “0” 15°. “1” 7.5°. (Only in six step drive).

Minimum ON time in Current

Bit 3

Bit 2

Min TON

limit. First Bit.

0

0

6µS

Minimum ON time in Current

0

1

3µS

limit. Second Bit.

1

0

9µS

1

1

7.6µS

Spindle Commutation Delay. “0” 30°. “1” 15°. (Only in six step drive).

Spindle Mask at acceleration.

Bit 6

Bit 5

Mask

First Bit.

0

0

3.2mS

Spindle Mask at acceleration.

0

1

1.6mS

Second Bit.

1

0

0.8mS

1

1

6.4mS

“0” Torque Optimizer Activated. “1” Torque Optimizer Frozen.

Reg:

2

Name: Spindle Set-Up 1 Register

Type: Write only

Address: 2Eh

BIT

0 IL0

1 IL1

LABEL

2 SSLEW

3 FLLEXT

DESCRIPTION

Current Limit and Inductive

Bit 1

Bit 0

Sense thresholds. First Bit.

0

0

Current Limit and Inductive

0

1

Sense thresholds. Second Bit.

1

0

1

1

Spindle Chopping Slew Rate. “0” 10V/µS. “1” 20V/µS.

Spindle Speed control loop. “0” Internal. “1” External.

Vlimit

0.45V

0.50V

0.55V

0.75V

12/23

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