M56784 Mitsubishi, M56784 Datasheet - Page 6

• Manufacturer Part Number: M56784
• Description: SPINDLE MOTOR DRIVER
• Manufacturer: Mitsubishi

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.
Figure 5.
RDS
V
CC
1
C
I
RDS
FG
FORWARD
High
High
MODE3
Low
Low
D
T
Q
FG
Hw+
V
Q
Q
Hv+
CC
R
1
D
T
FG-amp
Hu+
EC-ECR
Comparator
Hystelesis
RDS
FG
+
+
-
-
REVERSE
High
High
Low
Low
D
T
Q
Hu+ Hu- Hv+ Hv-
Hw+
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
Hall sensor-amp
Hu+
Hv+
MITSUBISHI <CONTROL / DRIVER IC>
Hw+
Hw-
SPINDLE MOTOR DRIVER
CC
1 by internal resistor (typ.10kohm).
M56784FP