MCF8316A: Motor not spinning under digital control interface

Varun Madabushi

Part Number: MCF8316A

Hello,

I have designed a PCB using the MCF8316A and am trying to use a microcontroller to control a small drone motor (7.4V input). On my PCB I have confirmed that the buck regulator outputs 5V correctly and the chip responds to an I2C device scan with the correct address (0x01). However if I hook a potentiometer up to the SPEED/WAKE pin and drive pins DRVOFF and BRAKE low, the motor does not turn. Is there anything I am missing?

Thank you.

over 3 years ago

0 Vishnu Balaraj over 3 years ago

TI__Mastermind 24415 points

Hi Varun,

Can you check if you configured the SPEED_MODE in PIN_CONFIG register to "Analog Mode" and set the OVERRIDE bit in ALGO_CTRL1 register to SPD_CMD using Analog/PWM/Freq mode?

Regards,

Vishnu

0 Varun Madabushi over 3 years ago in reply to Vishnu Balaraj

Prodigy 10 points

In the datasheet the values for those registers in the Reset column were both corresponding to the correct mode (0h). I thought that meant the IC would have those default values upon startup. I will double check and try setting them

0 Vishnu Balaraj over 3 years ago in reply to Varun Madabushi

TI__Mastermind 24415 points

Varun,

Values that you see in reset column are not the default EEPROM values. Please connect the device to the GUI and read all the registers and make sure the speed pin is configured as mentioned in my previous post.

Regards,

Vishnu

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MCF8316A: Motor not spinning under digital control interface