L6275 データシートの表示（PDF） - STMicroelectronics

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L6275

5V DISK DRIVE SPINDLE & VCM, POWER & CONTROL “COMBO”

STMicroelectronics 

L6275

INTERNAL REGISTER DEFINITION

Reg:

Name:

Type:

Address:

7

Spindle Status Register

Read only

7Eh

BIT

0

LABEL

THERMAL

1

THERM_WARN

2

ROTOR_STUCK

3

FAULT

4

MASK_TIME

5

ERROR_LOCK

6

ALIGN

7

GO

DESCRIPTION

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.

Thermal Shutdown Warning =0 indicates that the chip temperature is

approximately 25°C before the device goes in thermal shut down.

0 = A sequential Spindle BEMF has not been detected

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

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

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

mechanical.

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

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

0

1

2

3

LABEL

SSLEW

ICP

ISNS

4

IL1

5

IL0

6

CPL

7

CPH

”IL0”

0

1

0

1

0

1

0

1

12/17

DESCRIPTION

Spindle PWM (chopping) Slew Rate. 0 = 10VµS, 1 = 20Vµs

Spindle FLL Charge pump current. 1= 25µA, 0 = 100µA.

Unused. Set = 0.

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

roughly 1/3 of normal.

Adjust maximum voltage on Spindle Rsense

Adjust maximum voltage on Spindle Rsense

1 = Spindle FLL Charge pump low

1 = Spindle FLL Charge pump high

”IL1”

0

0

1

1

0

0

1

1

”ISNS”

0

0

0

0

1

1

1

1

V(I_SENSE) LIMIT (±10%)

0.45V

0.50V

0.55V

0.75V

0.15V

0.20V

0.25V

0.30V

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