Hello,
I am modifying an existing custom board with a sensor that requires exactly 1.9V VDD. Previously I was configuring REGOUT0 = UICR_REGOUT0_VOUT_2V1 but I was surprised to see that the only options are at 0.3V intervals. Since I have already printed proto PCBs under the assumption that I could configure this value, I would love some ideas on hoe to get the output VDD to be 1.9V. I would entertain hardware bodges or software solutions. Anyone have any ideas?
Hello,
The nRF52840’s internal regulator output voltage (VDD) is controlled by the REGOUT0 register in UICR
REGOU0 register suppots voøtage 1.8 to 3.3V in interval of 3. There is no software method to set the internal regulator to 1.9 V.
If your sensor requires a very tight voltage tolerance around 1.9 V, you must check the sensor's datasheet for its acceptable voltage range. Since the nRF52840 cannot provide 1.9 V directly, you can set the voltage 2.1 and can use an external LDO to regulate the voltage to1.9V. It could be the safest approach.
Hello,
The nRF52840’s internal regulator output voltage (VDD) is controlled by the REGOUT0 register in UICR
REGOU0 register suppots voøtage 1.8 to 3.3V in interval of 3. There is no software method to set the internal regulator to 1.9 V.
If your sensor requires a very tight voltage tolerance around 1.9 V, you must check the sensor's datasheet for its acceptable voltage range. Since the nRF52840 cannot provide 1.9 V directly, you can set the voltage 2.1 and can use an external LDO to regulate the voltage to1.9V. It could be the safest approach.
