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M56785FP

SPINDLE MOTOR DRIVER

MITSUBISHI ELECTRIC  

MITSUBISHI <CONTROL / DRIVER IC>

M56785FP

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

Q RT

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

+

-

+

-

Hall sensor-amp

Figure 5.

FORWARD

Hw+ Hv+ Hu+

D

T

Q

High

RDS Low

FG

High

Low

EC-ECR

REVERSE

Hw+

Hu+ Hv+

Comparator

Hysteresis

D

T

Q

High

RDS Low

FG

High

Low

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