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DRV8210: Can you use this package for latched relay or do I need to use DRV8210DSGR

TI-CSC
Genius 13015 points
Part Number: DRV8210

Hello E2E Experts,

Good day.

Can you use this package?

DRV8210DRLR for a single coil latched relay or do I need to use DRV8210DSGR? the data sheet only shows examples of the latter. 

I am asking this because, in my present setup with the DRV8210DRLR, I’m getting a reset when the relay switches state. Do I need to add TVS to the DRL package?

Please let me know if there are any workarounds for a single coil latched relay for the DRL package.

Regards,

CSC

  • 0
    TI__Mastermind 37683 points

    Hello,

    Did the customer provide any schematics of their design? 

    The main difference between the two packages, aside from the DRL coming in smaller package size, is that the DRL only comes with PWM control interface. The DSG is capable of 3 interface modes (PWM, Phase/Enable, and independent half-bridge control. 

    TI-CSC said:
    I am asking this because, in my present setup with the DRV8210DRLR, I’m getting a reset when the relay switches state. Do I need to add TVS to the DRL package?

    What do you mean by "reset"? Are the outputs disabled? There should not be any functional differences, aside from control interface, between the two packages. Did you test the DSG package?

    Regards,

    Pablo Armet

  • 0 in reply to Pablo Armet
    TI__Genius 13015 points

    Hello Pablo,

    Good day.

    I believe my issue is a spike from the relay coil.  Diagram attached.

    Regards,

    CSC

  • 0 in reply to TI-CSC
    TI__Mastermind 37683 points

    Hello,

    Have you measured the output current or voltage when the IC resets? This data will help us understand what is causing the fault. It could be due to overcurrent as you mention. 

    The schematic looks okay. My only recommendation is adding at least a 10uF capacitor on VM.

    Regards,

    Pablo Armet

  • 0 in reply to Pablo Armet
    TI__Genius 13015 points

    Hello Pablo,

    Good day.

    The CPU reset only when the relay changes states, this leads me to believe it’s a transient spike across the relay. The 8871 driver I originally used did not have any issues however I could not drive the circuit from 5 v and for this reason moved to the 8210. I do not have an oscilloscope where I am and do not have the ability to pick up spikes. From a multimeter perspective, the voltage looks to be stable at 5 v across the ps and also 4.8v when the relay is energized.

    Regards,

    CSC

  • 0 in reply to TI-CSC
    TI__Mastermind 37683 points

    Hello,

    If it is voltage/current spikes, it could be possible that OCP (over current protection) is triggering if the current is above the OCP threshold. One way to check if this is the root cause it to add some resistance in series with your load and DRV outputs to decrease it. Alternatively, an RC filter between DRV output and load can slow down the voltage transients.

    Regards,

    Pablo Armet