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Original question:

DRV5032: DRV5032 always ON?

DRV5032: Can the sensor be configured to stay ON continuously to not miss an event?

Shubhankar Menon
Expert 1325 points
Part Number: DRV5032
Other Parts Discussed in Thread: DRV5023, , DRV5033

Hello

I have an application of flow rate sensing. A magnet moves continuously over an array of 4 hall sensors in series, to generate pulses which are proportional to flow rate. However, if the sensor latches in a voltage state and stays in an LPM, I might miss a pulse. My flow rates vary from 0.1 hz to 50 hz. if the sensor is in an LPM when my magnet moves, a missed pulse would mean incorrect reading.

Is there a way around this? I looked at the alternate DRV5023, but I need a low power hall. The DRV5023 consumes current of around 2-4 mA which I cannot afford. Is there an alternate solution?

Best Regards

Shubhankar

  • 0
    TI__Mastermind 27715 points

    Hello Shubhankar,

    Unfortunately the DRV5032 is the only one of our Hall sensor switches that offers a low-power mode, and it cannot be configured for continuous measurement - the low-frequency sampling behavior is what enables such low power consumption. The only alternative I can think of is using one of our other Hall switches (DRV5021, DRV5023, DRV5033) and cycling power to it manually until a field is detected. These products have a typical power-on time of 35 to 40µs, which would give you plenty of margin to design your power cycling scheme and ensure you catch a flow rate of 50Hz.

    Best regards,

    Ian Williams
    Applications Manager
    Current & Magnetic Sensing