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After troubleshooting the Eval board for way too long,
I have taken a DRV8350H-EVM and disconnected the included Microcontroller's control signals from the DRV8350 since I was getting MCU faults with no explanation
This is to try and get an even more basic dev board with the DRV8350H acting as a "dumb" motor driver.
I am trying to spin a motor with 5V hall sensors
I brought out the following signals to play with in 1X PWM mode:
I removed the 3.3V pull ups on the hall sensors ( R42, R43 and R45) and populated R46, R48 and R51
The motor can "spin" but, all phase Voltages in reference to GND are equivalent, So I believe it is just turning on and off rapidly. I Especially believe this because the motor is stuttering and not really spinning.
am not sure what i am missing
Enable and INHA work as expected. where ENABLE will start or stop the motor and the PWM signal on INHA duty cycle increases and decreases "spinning" speed.
DIR seems to do nothing, floating or pulled to 5V has the motor turn the same direction.
Below is a capture from my scope that has all 3 phases of the motor when it is "spinning"
Hi Michael,
Can you zoom in on the waveform to show if the phases all each phases are 120 degrees apart? When the FETs have the same output, it may have entered a fault condition and can be determined by monitoring the nFAULT signal. (D10)
Can you show the Hall sensor outputs from the motor? Do they have the distinct states as shown below for the direction used? Is INLC = 1 so brake is not initiated? Can you remove the pulldown capacitors from the Hall signals for smoother Hall switching?
Thanks,
Aaron
All ofthe below images were taken at the following conditions
Zoom in of the phases while "spinning" (in reference to GND again)
Hall sensors while "spinning" measured at R46,48,51 (with Pulldown caps still installed), hall order looks backwards but, the motor is spinning counter clockwise compared to clockwise when I set up the halls and phases according to the FAQ you linked below)
Hall sensors without the pulldown caps installed while "spinning"
nFAULT pin while "spinning" (stays high when not spinning as well)
nBrake does not behave how you described, when I pull it high, the motor brakes, when i pull it low or leav it floating, the motor is allowed to spin.
