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System power off current consumption in nrf51422

soumil

Hi,

We have built a BLE product using nordic nrf51422. When system power off mode is enabled, the current consumption is coming to be around 16 uA. In our application, we expect leakage current from different IC's to be 7uA. We are not sure on reason for the additional 9uA current. What could be the reason? Any help will be appreciated.

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    Hi,

    The current in system off is specified as 0.6 µA, alternately 1.6 µA if used in low voltage mode. Then you add 0.6 µA for each 8 kB block of RAM you retain. I would current draw from look pull resistors, diode leakage etc for the final µAs.

    Best regards,

    Øyvind

  • 0 in reply to Øyvind Karlsen

    First off you'll need to restrict yourself to one example, such as your application. Then you need to be sure that you are actually turning off all peripherals so that you are actually in the sleep condition you expect, e.g. if you run a timer it will increase your current draw.

    Finally it may be that you are measuring dynamic current and not sleep current, in order to measure the sleep current reliably you will have to ensure that your measuring equipment is good enough for the expected sleep time you try to measure. A common example is if you use a cheap multimeter, with some form of averaging. In this case you will see the TX/RX/CPU active current draw as part of what you expected to be sleep current.

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  • 0 in reply to Øyvind Karlsen

    First off you'll need to restrict yourself to one example, such as your application. Then you need to be sure that you are actually turning off all peripherals so that you are actually in the sleep condition you expect, e.g. if you run a timer it will increase your current draw.

    Finally it may be that you are measuring dynamic current and not sleep current, in order to measure the sleep current reliably you will have to ensure that your measuring equipment is good enough for the expected sleep time you try to measure. A common example is if you use a cheap multimeter, with some form of averaging. In this case you will see the TX/RX/CPU active current draw as part of what you expected to be sleep current.

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