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Do I need a DC-DC converter for a wireless keyboard using nRF52832?

leon_q

I am planning on creating a wireless keyboard with the nRF52832, and I intend to supply it with power from a ML2032 (3-volt) rechargeable button cell battery. Is it feasible to use this battery directly without additional power conditioning, or should a DC-DC converter be incorporated to ensure stable voltage supply?

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    Lots of posts on this subject, search for CR2032. In principle just use the nRF52832 internal DC-DC converter (no external regulator), provide lots of ceramic bulk capacitance (150uF or more), isolate any power-hungry peripherals such as LEDs from the nRF52832 with an ideal diode (MAX40203); you don't care about voltage drops on the CR2032 due to large current pulses but they must be isolated from the nRF52832 to prevent potential resets. The CR2032 is a trickle charger for the bulk capacitance. LEDs require higher voltage than a end-of-life coin cell; use a voltage doubler or (worst case) buck-boost regulator for anything that requires > 2.7 volts.

    energy-buffering-for-cr2032-battery

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    Lots of posts on this subject, search for CR2032. In principle just use the nRF52832 internal DC-DC converter (no external regulator), provide lots of ceramic bulk capacitance (150uF or more), isolate any power-hungry peripherals such as LEDs from the nRF52832 with an ideal diode (MAX40203); you don't care about voltage drops on the CR2032 due to large current pulses but they must be isolated from the nRF52832 to prevent potential resets. The CR2032 is a trickle charger for the bulk capacitance. LEDs require higher voltage than a end-of-life coin cell; use a voltage doubler or (worst case) buck-boost regulator for anything that requires > 2.7 volts.

    energy-buffering-for-cr2032-battery

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