L7200 datasheet(19/23 Pages) STMICROELECTRONICS

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L7200

Reg:

Name:

System FunctionSet-Up Register

Type:

Write only

Address: EEh

BIT

LABEL

DESCRIPTION

GAINSWITCH

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

EXTP

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

EXTN

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

EXTVCM

VCM mode. “0” Internal. “1” External.

VBDIS

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

SHOCKEN

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

Reg:

Name:

Spindle Diagnostic Register

Type:

Read only

Address: 0Fh

BIT

LABEL

DESCRIPTION

LOCK

“0” Indicates Spindle Speed error (>16

µS sample, either mechanical or

electrical).

NOTHR

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

PHREADY

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

STUCKROTOR

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

PHASE<0>

Inductive Sense Phase detected. First Bit.

PHASE<1>

Inductive Sense Phase detected. Second Bit.

PHASE<2>

Inductive Sense Phase detected. Third Bit.

BACKSPIN

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

INTERNAL REGISTERS DEFINITION (continued)

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