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DRV8832: Current Monitor Circuit

Pratik Panchal1
Prodigy 225 points
Part Number: DRV8832

Tool/software:

Hello Team,

We have used this motor driver IC for one home automation project where we want to measure/observe the current measurement. So, whenever if there is fault or stall condition we can manually control the power for the motor.

Please advise how we can implement this logic using this part.

  • 0
    TI__Mastermind 19860 points

    Hi Pratik,

    The current can be measured/observed by monitoring the ISENSE pin. When the voltage on pin ISENSE exceeds VILIM (0.2 V), overcurrent is detected. The RSENSE resistor should be sized to set the desired ILIMIT level.

    RISENSE = 0.2 V / ILIMIT

    Be sure that ILIMIT is set higher than normal operating current to avoid false trips. 

    It is also advisable to evaluate this design using our DRV8832EVM. All schematics, layouts, and operating procedures are described in the User's Guide. 

    DRV8832EVM Evaluation board | TI.com 

    DRV8830-32 User Guide (ti.com) 

    Best,

    David

  • 0 in reply to David Medis
    Prodigy 225 points

    Hello David,

    I am aware that with the help of ISENSE, we can identify over current fault. But is there any method we can check what actual current is flowing?

    We have multiple variants of the product where we are going to have different loads. We need to set the resistor limit for all the variants based on the requirement. If so we need to manage multiple SKUs which will be difficult for production.

    Please advise.

  • 0 in reply to Pratik Panchal1
    TI__Mastermind 19860 points

    Hi Pratik,

    The DRV8832 has current regulation but not integrated current sensing. In order to monitor the actual current flowing through the load, you will need one of our motor drivers that offers an integrated current sensing feature. 

    External current sensing is also an option but will require external components, board space, firmware, etc. and it could be worth looking into one of TI's integrated solutions. 

    DRV8213 has an internal current mirror that implements current sensing and regulation. This eliminates the need for a large power shunt resistor, saving board area and reducing system cost. This output can be fed directly to the MCU for constant current monitoring. 

    Best,

    David