INTERNAL REGISTER DEFINITION

Reg:

Name:

Type:

Address:

7

Spindle Status Register

Read only

7Eh

BIT

LABEL

DESCRIPTION

0

THERMAL

Thermal Shutdown = 0 indicates that the chip temperature has exceeded 160

°C.

The bit will reset (=1) when the temperature falls below 130

°C. When Thermal

Shutdown =0, the spindle logic will tristate both high and low side drivers,

protecting the output circuitry.

1

THERM_WARN

Thermal Shutdown Warning =0 indicates that the chip temperature is

approximately 25

°C before the device goes in thermal shut down.

2

ROTOR_STUCK

0 = A sequential Spindle BEMF has not been detected

3

FAULT

1 = Rapid deceleration of the Spindle motor or High frequency on FCOM signal.

4

MASK_TIME

Mask Time toggled to ”0” indicates that the Spindle BEMF is masked.

5

ERROR_LOCK

0 = Indicates error Spindle speed > 16msec/sample, either electrical or

mechanical.

6

ALIGN

0 indicate that the Spindle is in the Internal Start-Up Align Phase.

7

GO

0 indicate that the Spindle is in the Internal Start-Up Go Phase.

Reg:

Name:

Type:

Address:

8

Spindle FLL Register

Write only

8Eh

BIT

LABEL

DESCRIPTION

0

SSLEW

Spindle PWM (chopping) Slew Rate. 0 = 10V

µS, 1 = 20Vµs

1

ICP

Spindle FLL Charge pump current. 1= 25

µA, 0 = 100µA.

2

Unused. Set = 0.

3

ISNS

1 = Puts output of the Spindle sense amplifier on FCOM pin and changes limit to

roughly 1/3 of normal.

4

IL1

Adjust maximum voltage on Spindle Rsense

5

IL0

Adjust maximum voltage on Spindle Rsense

6

CPL

1 = Spindle FLL Charge pump low

7

CPH

1 = Spindle FLL Charge pump high

”IL0”

”IL1”

”ISNS”

V(I_SENSE) LIMIT (

±10%)

0

0

0

0.45V

1

0

0

0.50V

0

1

0

0.55V

1

1

0

0.75V

0

0

1

0.15V

1

0

1

0.20V

0

1

1

0.25V

1

1

1

0.30V

L6269

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