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OPT3101-SDK: How long it last on a 1200mA battery?

Art Mecina
Genius 16785 points
Part Number: OPT3101-SDK
Other Parts Discussed in Thread: OPT3101

Hello Guys,

Good day.

A customer of ours were looking to detect a change in distance up to 2 metres and wake it up every second for a brief period. How long could it last approximately on a 1200 mA battery, could it make over a year?

Thanks in advance!

Art

  • 0
    TI__Mastermind 25905 points

    Hi Art,

    OPT3101 current consumption can be calculated as sleep current (3-4uA) plus LED current while device is powered up. For example, if we assume max current in the LED (this can also be reduced to reduce power) it is 173mA current every second. The on time and LED current are both something that will depend on the customer requirements. On OPT3101 each sub frame is 250us. So then capturing only one frame each second is 173mA*(250us/1second)*(50% LED modulation) = 43.25/2 = 21.63 uA from LED (on for only 250us of the 1 second) and 3uA from sleep for 24.63 uA total average current. Usually more frames would be captured to reduce noise, but this gives an idea and this number can be adjusted based on the LED current setting and averaging chosen.

    Best,

    Alex

  • 0 in reply to Alex Bhandari-Young
    TI__Mastermind 25905 points

    Updated above to account for LED 50% modulation which halves the LED current in the calculation.

    Best,

    Alex