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DRV5032: DRV5032 WORKING AND POWER CONSUMPTION

Part Number: DRV5032
Other Parts Discussed in Thread: DRV5012

Hi

I am looking for ultra low power bipolar hall sensor. I found that DRV5032 is low power device. can some please explain me in details what will be the power consumption when there is no magnetic field? and i am looking for sensor which makes output low when south pole is subjected to hall sensor and outputs goes high for north pole, drv5032 DOES THE SAME?

  • Brijesh,

    Thanks for choosing the TI forum.

    The DRV5032 is a low-power duty cycled switch, which has 5Hz and 20Hz versions available. At this given frequency, the device wakes up from its low power mode, captures and updates a sample, and then returns to sleep mode until the next sample. There will be a spike in the current flow during the sample and hold period of the internal ADC (this is shown in the datasheet as ICC(pk), shown below), but for each version of the device, there is an ICC(avg) that takes this value, as well as the low power mode into account, and provides you the power consumed by the device. Power consumption occurs regardless of presence/lack of a magnetic field, as the device is simply sampling whether or not the field is present. Controlling the device at a lower voltage, as shown, can reduce the average current in the device:

    On the output side, push-pull output allows for the lowest system power consumption, since there is no current leakage path when the output drives high or low. Open-drain output parts will involve a leakage path when the output drives low, through the external pull-up resistor, and you'll need to account for that based on the size of the resistor chosen.

    Regarding your second question, when you say "i am looking for sensor which makes output low when south pole is subjected to hall sensor and outputs goes high for north pole," are you saying that you need a device that goes active low from a south pole, and remains low until it sees a north pole, or do you simply need a device that remains in an active high state in the presence of a north pole? If you need the first option, this is actually a latch, not a switch, and I would advise you to have a look at the DRV5012. If you need the second option, I would look at DRV5032DU or DRV5032FD.