L7200 데이터 시트보기 (PDF) - STMicroelectronics

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L7200

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

STMicroelectronics 

L7200

INTERNAL REGISTERS DEFINITION (continued)

Reg:

14

Name: System FunctionSet-Up Register

Type: Write only

Address: EEh

BIT

LABEL

0 GAINSWITCH

1 EXTP

2 EXTN

3 EXTVCM

4 VBDIS

5 SHOCKEN

6

7

DESCRIPTION

VCM current loop Gain Switch. “0” Switch open. “1” Switch close.

VCM external mode VCMP output. “0” VCMP low. “1” VCMP high.

VCM external mode VCMN output. “0” VCMN low. “1” VCMN high.

VCM mode. “0” Internal. “1” External.

Vboost oscillatotor. “0” Enabled. “1” Disabled.

Schock Detector. “0” Disabled. “1” Enabled.

Reg:

15

Name: Spindle Diagnostic Register

Type: Read only

Address: 0Fh

BIT

0 LOCK

LABEL

1 NOTHR

2 PHREADY

3 STUCKROTOR

4 PHASE<0>

5 PHASE<1>

6 PHASE<2>

7 BACKSPIN

DESCRIPTION

“0” Indicates Spindle Speed error (>16µS sample, either mechanical or

electrical).

“1” Indicates that the Inductive Sense threshold is not reached.

“1” Indicates that the Phase reading of the motor succeded.

“1” Indicates that the Spindle BEMF is not detected.

Inductive Sense Phase detected. First Bit.

Inductive Sense Phase detected. Second Bit.

Inductive Sense Phase detected. Third Bit.

“1” Indicateds a Back rotation of the Spindle Motor.

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