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Data rate vs power consumption vs latency

Hi. We're looking at nordic modules for a range of new miniaturized health sensors.

Does anyone know how to compute the current consumption of a BLE module given the data rate and latency? It seems there are too many parameters to this question and we can't risk months of development time trying to figure it out experimentally. There seems to be much confusion out there, some platforms (iphone) limit ble data rate to less than theoretically possible, and some modules limit you to using RFCOMM which has drawbacks and performance penalties. We know that it's possible to connect and send multiple packets (up to 6 at a time), but there are reports that when this is done, the theoretical increase in bandwidth is not achieved.

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  • Hi kwas. Depending my multimeter and code, I measure this results on continuous packet sending. There could be 'little' higher than actual due some peripherals using (like UART). nrf51822 to CSR USB PC dongle device. (I don't know if IPhones supports that RX rates. It has to accept 6 packet data etc...)

    Using SDK 5.1 and SoftDevice 6.0 @ 3.3v

    • @13 kbps -> 4.90 mA
    • @74 kbps -> 6.82 mA
    • @124 kbps -> 8.39 mA
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  • Hi kwas. Depending my multimeter and code, I measure this results on continuous packet sending. There could be 'little' higher than actual due some peripherals using (like UART). nrf51822 to CSR USB PC dongle device. (I don't know if IPhones supports that RX rates. It has to accept 6 packet data etc...)

    Using SDK 5.1 and SoftDevice 6.0 @ 3.3v

    • @13 kbps -> 4.90 mA
    • @74 kbps -> 6.82 mA
    • @124 kbps -> 8.39 mA
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