m56785fp Mitsumi Electronics, Corp., m56785fp Datasheet - Page 6

• Manufacturer Part Number: m56785fp
• Description: Spindle Motor Driver
• Manufacturer: Mitsumi Electronics, Corp.

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 V
Figure 5.
RDS
V
CC1
RDS
FG
CC1
C
I
FORWARD
by internal resistor (typ.10kohm).
High
High
Low
Low
Q
MODE3
D
T
Hw+
FG
Hv+
V
Q
Q
CC1
R
D
T
Hu+
FG-amp
EC-ECR
Comparator
Hysteresis
RDS
FG
+
+
-
-
REVERSE
High
High
Low
Low
Q
D
T
MITSUBISHI <CONTROL / DRIVER IC>
Hu+
Hw+
Hu-
Hall sensor-amp
Hu+
Hv+
SPINDLE MOTOR DRIVER
Hv+
Hv-
Hw+
M56785FP
Hw-