DB62 Datasheet | Apex Microtechnology

features are programmed in the MCU provided with the DB62: 1. User Controlled PWM frequency using external potentiometer (VFREQ in EVAL 49 board). The PWM frequency can be varied from 4 KHz to 118 KHz. 2. User Controlled PWM duty cycle using external potentiometer (VDUC in EVAL49 board). The voltage set by the potentiometer will act as a ‘Speed Reference’. The duty cycle can be varied from 0 % to 98 %. The Forward/Reverse button is provided to control the direction of the motor. Depending upon the direction, the corresponding hall sensor mutation sequence is used and the PWM signals are generated accordingly. The START/STOP button can be used to run or stop the motor. As mentioned earlier, the MCU provided with the kit is preprogrammed for all of the features described above. The hall sensor mutation table that has been used in programming the MCU is shown in table 1. Sensor Output HALLA 0 0 0 1 1 1 0 0 0 1 1 1 HALLB 0 1 1 1 0 0 1 1 0 0 0 1 HALLC 1 1 0 0 0 1 0 1 1 1 0 0 ØC (OUTC) X HI HI X LO LO LO LO X HI HI X Driver Output ØB (OUTB) HI X LO LO X HI HI X LO LO X HI ØA (OUTA) LO LO X HI HI X X HI HI X LO LO CCW Rotation Facing Lead End CW Rotation Lead End Table 1. mutation Table. The algorithm for the microcontroller is shown in figure 1. The program for Microchip®...