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When I look at the nRF24L01+ datasheet, I'm confused by two apparently conflicting details.

  • "1.9 to 3.6V supply range" (page 1, Key Features)
  • 5.25V maximum input voltage Vi (page 12, "absolute maximum ratings")

So, two parts of my question:

  • practically, can I power this chip from a regulated Vcc of 5V?
  • what is the difference of "supply range" and "maximum input voltage" ?
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practically, can I power this chip from a regulated Vcc of 5V?

No. The chip can take a maximum of 3.6V as its supply. And since its supply current is so low (<15mA) you can use one of those SOT-23 voltage regulators, so no reason not to.

what is the difference of "supply range" and "maximum input voltage" ?

You must keep its supply voltage within its supply voltage range. You can apply a higher voltage at its digital inputs, i.e. connect a 5V CMOS output to one of the chip's inputs directly.

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  • \$\begingroup\$ Thanks! So to make sure I understand: "supply range" typically refers to the power input, and "maximum input voltage" typically refers to the digital lines? \$\endgroup\$
    – Mark Harrison
    Commented Aug 14, 2014 at 18:36
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    \$\begingroup\$ Digital inputs, yes. Digital outputs may have their own limits. \$\endgroup\$
    – Ignacio Vazquez-Abrams
    Commented Aug 14, 2014 at 18:47

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