• State Resolved
  • Locked Locked
  • Replies 6 replies
  • Subscribers 30 subscribers
  • Views 1179 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

DRV8833C Evaluation Module

Bing Wu0
Prodigy 40 points
Other Parts Discussed in Thread: DRV8833C

DRV8833C Evaluation Module 1. On the datasheet, it says If external control of the DRV8833C is desired, remove R11 to isolate the MCU from the DRV8833C. I'm currently using an external MCU, how do I remove the R11 on this evaluation board.

2. I would like to use an external MCU to control the nSleep mode with a GPIO, is there a connection point on this eval board for me to use a jumper wire to connect my external MCU breakout board?

3. I'm currently supplying the voltage 5 V to this DRV8833C Evaluation Module using one of the 5V pin on the MCU breakout board, when I try to connect the whole setup to the laptop using a USB cable, the laptop gives a message saying the USB device has exceeded the power limit, I don't quite understand why this would happen, as the motor driver can be supplied between 1.8-10 V, and I'm giving it 5V now. Please help and explain this. 

  • 0
    TI__Guru** 114905 points
    Hi Bing,

    R11 is a resistor pack. A solder rework station is the preferred method of removing R11

    You can control nSLEEP by removing the nSLEEP jumper and controlling the device there.

    Are you running the motor when you receive the message? The USB may not be able to run the connected motor.
  • 0 in reply to Rick Duncan
    Prodigy 40 points
    Hi Rick,

    Just make sure I have the right understanding on the R11, it's the black one sitting in between the U2 and J4 connector?
    I can remove the jumper and use a GPIO pin from my MCU breakout board to control the nSleep on the DRV8833C board, but how should I connect the GPIO to the nsleep pin on the eval board, the left pin or the right pin?

    Yes, i'm running the motor when i receive the message. The laptop USB port gives 500mA but if I use a dual USB cable, would this solve the problem or a wall plug USB?
  • 0 in reply to Bing Wu0
    TI__Guru** 114905 points
    Hi Bing

    Yes, R11 is the black one sitting in between the U2 and J4 connector.

    There are two methods to determine the which pin to connect.

    After the jumper is removed, measure the voltage on the two pins with the board powered. You want to connect to the side that measures ~0V. The other side is connected to V3P3 of the regulator, and used to wake the device. The second method is to examine the layout files available on line.

    Using a dual USB may solve the problem. It is recommended to provide power separately.
  • 0 in reply to Rick Duncan
    Prodigy 40 points
    Thanks. This answered my question.
  • 0 in reply to Rick Duncan
    Prodigy 40 points

    Hi Rick,

    Just before I'm removing the R11, I have one more question, what's the consequence of keeping R11 on the board, can I still control the motor driver from an external MCU?

    Thanks.

    Bing

  • 0 in reply to Bing Wu0
    TI__Guru** 114905 points
    Hi Bing,

    It is not recommended to leave R11 installed when using an external mcu.

    As the external mcu provides signals to the motor driver, the on board mcu may power up if it is not already powered. This can happen due to internal diodes in the mcu from the GPIO to VCC.

    If powered (through the internal diodes or directly), the GPIOs of the on board mcu may act against the external mcu. This could prevent the desired voltage on the inputs of the motor driver.