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Interface RGB LED with nRF52840 in Low Power Mode

Dhara

Hi,

I want to interface RGB LED- APHF1608LSEEQBDZGKC (Kingbright make) with nRF52840 operating at low power mode on 1.8V (@Vdd). The 1.8V external source is capable to drive the RGB LED but is there need of connecting the external transistor circuit to interface the LEDs on GPIO of nRF52840.?

Is the sink current capacity of nRF52840 sufficient enough in low power mode (1.8V) to sustain the switching of RGB LED with If, forward current = 20mA??

Please refer the attached snapshot of the schematic file.

Thanks.

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    First 20mA will drain the planet's resources, perhaps try at just a mA or so which is easily visible with current tri-colour LEDs .. second 1.8 volts is plenty enough if you use a voltage doubler at low current, which typically requires two capacitors and two diodes, but in this case you can throw away the transistors and use a single extra diode and capacitor. Google should provide plenty of answers, as a starting point and further explanation here is one: link

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    First 20mA will drain the planet's resources, perhaps try at just a mA or so which is easily visible with current tri-colour LEDs .. second 1.8 volts is plenty enough if you use a voltage doubler at low current, which typically requires two capacitors and two diodes, but in this case you can throw away the transistors and use a single extra diode and capacitor. Google should provide plenty of answers, as a starting point and further explanation here is one: link

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