• State Resolved
  • Locked Locked
  • Replies 3 replies
  • Subscribers 30 subscribers
  • Views 336 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.

Original question:

DRV8308EVM: DRV8308EVM: Transient and ISENSE current for EMI/EMC improvement

DRV8308: Clock Frequency Mode with EEPROM: with variable Motor SPEED without using MCU

Sadashiva Kamath
Expert 1175 points
Part Number: DRV8308

I'm Planning to operate DRV8308 in Clock Frequency Mode with EEPROM configuration. Also, We need user programmable SPEED setting using potentiometer. I'm looking for controller less solution for Motor controller

1) Is there any new IC (manufactured within 8-10 years)  available from TI on Analog to Frequency converter IC?

2) Can I directly connect FAULTn & LOCKn  pins to ENABLE pin (with pull-up resistor)?

  • 0
    TI__Guru 65430 points

    Sadashiva,

    What is the power level of your motor in this system? If it is low then we might be able to use one of the DRV10 devices.

    FAULTn and LOCKn are status output pins that need pull-ups because they are Open Drain style. They are not control pins. I would pull them up using your system 3.3V rail, the internal MCU pull-ups, or the VREG pin of the DRV8308.

    Regards,

    -Adam

  • 0 in reply to Adam Sidelsky
    Expert 1175 points

    Thanks Adam,

    Motor voltage is 12.5V. Current is 1.5Arms typ. Transient current 4A

    We're looking for closed loop SPEED control in motor driver without using external controller.

    Questons:

    1) DRV10 devices meets above needs?

    2) Can I short FAULTn, LOCKn  and ENABLE pins together (with pull-up resistor connected to 3.3V rail)? Need: Motor should disable when FAULTn or LOCKn flags are asserted

  • 0 in reply to Sadashiva Kamath
    TI__Guru 65430 points

    Sadashiva,

    Yes you can use nFAULT to disable the ENABLE pin but it would be better to use the MCU to gate these signals so that you can independently control the enable and fault signals.

    Regards,

    -Adam