L6260 데이터 시트보기 (PDF) - STMicroelectronics

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L6260

4.5-5.5V DISK DRIVER SPINDLE & VCM, POWER & CONTROL COMBOS

STMicroelectronics 

L6260

System Control Register A (Reg 3)

Reg: 3

Name: System Control Register A

Type: Write only.

BIT

LABEL

0 SPIN_ENABLE

1 VCM_ENABLE

2 SRESET

3 INCRE

4 RUN_SRCH

5 8_12P

6 BIP_TRIP

7 UNI_TRIP

8 VCMRET

9 SPEED

10 EL_MECH

11 TEST_COUNT_RESET

DESCRIPTION

@POR

Enable spindle functions (1 = enabled; 0 = Disabled). Together

0

with VCM_ENABLE, determine the Normal, Idle or Sleep mode of

operation. See Mode Table for details.

Enable VCM functions (1 = enabled; 0 = Disabled). Together with

0

SPIN_ENABLE, determine the Normal, Idle or Sleep mode of

operation. See Mode Table for details.

Reset spindle state machine (sequencer). 0=Reset. All spindle

0

and FLL registers are also reset. Also used to control the charge

pump (1 = off).

A 0 to 1 transition of this bit increments the spindle state machine. 0

Normally used in SEARCH mode. Must be set to 1 in RUN Mode.

1=Auto-increment enabled (RUN Mode)

0

0 = Auto-increment disabled (SEARCH MODE)

Selects 8/12 pole motor: 1 = 8 pole, 0 = 12 pole

0

Define Tristate, Bipolar, or Tripolar operation:

0

See Spindle Drive Mode Table.

0

Activated VCM Retract: 1 = retract.

0

Programs the Spindle Speed Control Method.

0

SPEED= 0: The L6260 operates open loop, with speed error

sensing performed externally and speed effort written into the

SPIN_DAC.

SPEED = 1: The speed is controlled internally through the built-in

control loop.

Specifies electrical or mechanical cycle for the FLL control.

0

1 = Electrical, 0 = Mechanical

Writing a 0 resets the test sequence. Must be set to 1 to allow

0

ATEST and DTEST functions.

MODE OF OPERATION (REGISTER 3 BITS 0 AND 1)

SPIN_ENABLE

(0) DISABLED

(0) DISABLED

(1) ENABLED

(1) ENABLED

VCM_ENABLE

(0) DISABLED

(1) ENABLED

(0) DISABLED

(1) ENABLED

MODE

SLEEP

NOT NORMAL

IDLE

NORMAL

DESCRIPTION

MINIMUM POWER DISSIPATION.

VCM IS FORCED TO A PARK CONDITION

VCM DISABLED FOR REDUCED DISSIPATION

NORMAL MODE OF OPERATION

SPINDLE DRIVE MODE (REGISTER 3 BITS 6 AND 7)

BIP_TRIP

0

0

1

1

UNI_TRIP

0

1

0

1

SPINDLE DRIVE MODE

TRISTATE

NOT DEFINED

BIPOLAR

TRIPOLAR

11/30

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