L6238 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

L6238

SENSORLESS SPINDLE MOTOR CONTROLLER

STMicroelectronics 

L6238

2.0 STATE DIAGRAMS

2.1 State Diagram

Figure 4 is a complete State Diagram of the con-

troller depicting the operational flow as a function

of the control pins and motor status. The flow can

be separated into four distinct operations.

Figure 5: Align+Go

2.2 Align + Go

Figure 5 represent the normal flow that will

achieve a spin-up and phase lock of the spindle

motor. Upon power up, the controller first checks

to determine if the motor is still spinning. This

”Hold For Resync” decision block will be dis-

cussed later.

Power

on

Reset

RunBrk = 1

OutEna = 0

Hold

for

”Res ync”

RunBrk = 0

RunBrk = 1

Hold & wait

for decision

Hold for

”Align & Go”

OutEna = 0

&

RunBrk = 0

Start

”Align & Go”

Align = 0

Align =

Seqncr.

Go = 0

Run

9/35

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