M56784 데이터 시트보기 (PDF) - MITSUBISHI ELECTRIC

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M56784

SPINDLE MOTOR DRIVER

MITSUBISHI ELECTRIC  

MITSUBISHI <CONTROL / DRIVER IC>

M56784FP

SPINDLE MOTOR DRIVER

FORWARD AND REVERSE ROTATION DETECT

FUNCTION

Figure 5 shows the circuits and the functions of the forward and

reverse rotation detect.

The output of the RDS pin is determined by the signals of hall

inputs (Hu+, Hu-, Hv+ and Hv-) which indicate the direction of

rotation.

When the motor is spinning forward, the RDS pin output will be

low. When the motor rotates reversely in stop mode, it will be high.

The RDS pin is pulled-up to VCC1 by internal resistor (typ.10kohm).

RDS

MODE3 FG

VCC1

VCC1

CI

FG-amp

QD

QT

R

Hu+ Hu- Hv+ Hv- Hw+ Hw-

+

-

+

-

Hall sensor-amp

FORWARD Hw+ Hv+ Hu+

EC-ECR

REVERSE Hw+ Hu+ Hv+

Comparator

Hystelesis

D

T

Q

High

RDS

Low

FG High

Low

D

T

Q

High

RDS

Low

FG High

Low

Figure 5.

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