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DRV10983EVM: Lock Code 0x4 and BEMF Abnormal

Part Number: DRV10983EVM
Other Parts Discussed in Thread: DRV10983, DRV10964


I am trying to run a hard drive motor with the DRV10983EVM, but I am running into Lock Code 0x4 and BEMF Abnormal errors.

The Kt is calculated as follows, where 4200 rpm is the design speed of the motor:

4200 rpm / (60/ 6 pole pairs)= 420 Hz

3.3 V / 420 Hz = 7.87 mV/Hz

The motor makes some clicking sounds while spinning sporadically in both directions and then spins in one direction for a second before stopping for a few seconds and beginning the cycle again. Any ideas what may be going on?

Additionally, I saw on another form that DRV10983Q1 can go down to 6.2V operation, the motor we are using runs on 3.3V - is it possible for the DRV10983 to run this motor at 3.3V? If not, could a voltage divider work to step the voltage down from the ESC for the motor? Thank you very much for your help.



  • Hi Abhay,

    Thanks for posting your question in MD forum. Unfortunately, DRV10983 cannot support 3.3V. The minimum motor voltage that this device can support is 6.2V. We have DRV10964 which is a low voltage drive. This device can support up to 500 mA continuous current and 875 mA startup/lock current. Please check DRV10x selection guide and DRV10964 Datasheet for more information. Please let me know if you have any questions.