L6238 datasheet(9/35 Pages) STMICROELECTRONICS

Part #	L6238

Description	SENSORLESS SPINDLE MOTOR CONTROLLER

PDF	35 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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9 / 35 page

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.

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.

Hol d & wait

f or de cisio n

RunBrk = 0

RunBrk = 1

Hold for

”Ali gn & Go ”

Hold

for

”Res ync”

Start

”Align & Go”

Align =

Se qncr.

Run

Alig

n =

o =

Power

Reset

RunBrk = 1

OutEna = 0

OutEn a = 0

Ru nBrk = 0

Figure 5: Align+Go

L6238

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L6238 Datasheet(PDF) 9 Page - STMicroelectronics