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AN07-00180-3E
4.3
BLDC motor rotation control by the microcontroller
This section describes how the BLDC motor is practically controlled with the 120° conduction method by
the microcontroller.
On the board, as shown in “ Figure 4-4 Motor driver circuit ”, the micro controller is connected with the
motor driver circuit. The relationship of the connections with the semiconductor elements described in
“ 4.2 How does the BLDC motor rotate? ” is as shown in “ Table 4-1 Microcontroller pin/Motor driver
circuit connections ”. By turning RTO0 to 5 on/off according to the positions of the hall elements as
shown in “ Figure 4-3 120° conduction method time chart ”, the motor can be rotated.
Anode
Cathode
Anode
Cathode
Same as RTO0/RTO1
Same as RTO0/RTO1
Figure 4-4 Motor driver circuit
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