Regarding the relationship between BlueNRG-1 ADC sampling and battery power

千本樱大白

Regarding the relationship between BlueNRG-1 ADC sampling and battery power [Copy link]

 

Now when the power supply is a little bit above 3.3V, the sampled value of ADC1 is too low, the sampled value of ADC2 is too high, the sampled value of the temperature detection itself is erratic, and the chip reset will not correct this problem and the sampled value will always be biased. Previously, the sampled value of the same program at 3.2-3.3V was normal. I would like to ask, what is the impact of the chip power supply on ADC sampling? How to compensate it better? Happy New Year.

littleshrimp

ADC sampling uses an internal 2.4v voltage reference, which is theoretically not affected by the power supply voltage.

What voltage are you measuring? Is the output impedance high?

If possible, please provide the circuit.

eew_V6U47U

Is the power ripple large?