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I've attached a picture from a datasheet (RN42 Bluetooth module) that I've been looking at. The amount of current specified for transmit is 45 mA, is this per a packet of data sent? So to send 1 Mbyte of data it would draw 45A!?!?! Sounds stupid but what is the 45 mA relational to?

enter image description here

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    \$\begingroup\$ Current doesn't accumulate over time; the device just draws 45mA while it's transmitting. Energy is cumulative. \$\endgroup\$
    – Chu
    Oct 23, 2016 at 13:00

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No, it means that while you are transmitting data, it draws 45 mA from the power supply. The maximum transfer rate is 3Mbps, so it takes about 1/3 second to send 1Mbit of data. Under this 1/3 second the current consumption of the module is 45mA.

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  • \$\begingroup\$ but that implies that it would also me 45mA energy consumption if the data transfer were lasting for the full second. \$\endgroup\$
    – hoboBob
    Oct 24, 2016 at 7:24

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