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DRV8823 has ability to monitor the current/charge

Other Parts Discussed in Thread: DRV8823, DRV8806, DRV8846, DRV8881, DRV8848

1.We would like to connect DC latch Solenoid to DRV8823 and want to monitor if the solenoid switch its state by observing the current which is flowing through the DRV8823, is it possible?

If the answer is yes, how it is been done?

2.Are there cheaper alternatives for only 2 solenoids instead of 4 (which are supported in DRV8823)? (2 H-bridges)

3.What is the difference between DRV8806 and DRV8823? (Let’s assume that we need to hold 1.5A pulse and not 2A)

Thanks in advance

  • Hi Shai,

    1) It would be best to contact the manufacturer of the solenoid to determine if the state can be determined by observing the current.

    2) Yes there are other devices, but most do not have a serial interface. If you can use a device with a serial interface, please look at the DRV8881E and DRV8881P.

    3) The DRV8806 does not have high side FETs. The DRV8806 also does not have the ability to monitor current.
  • Hi Rick,
    DRV8823 has 4 H-Bridges and we need only 2 H-bridges. The request is for 1.5A (not 2A).
    Can we use DRV8846 and we will get the same good/bad indication like from the DRV8823?
    What about the DRV8881 ?
    My focus is the have the same function as DRV8823 but with 2 H-bridges and I looking for a cheaper solution than DRV8823,
    What can you advise me?
    Thanks in advance
  • Hi Shai,

    The DRV8846 is a stepper motor driver with an internal indexer and voltage max of 18V. If you can use 18V, it is suggested to look at the DRV8848 for your application.

    The DRV8881E or DRV8881P will also work. With a voltage max of 45V, the DRV8881 is closer to the DRV8823. The DRV8881 can control the current using various decay modes (DRV8881E has AutoTune), and has a fault indicator. The nFAULT pin alerts the system to undervoltage, overcurrent, and overtemperature conditions.