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Forum Index : Microcontroller and PC projects : better measurements by a running mean
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Mixtel90 Guru  Joined: 05/10/2019 Location: United KingdomPosts: 7937 |
You could read the ADC reference directly from the ADC_VREF pin (35) just to see what it's like (R8 is in the way, but it's probably not important). You're not supposed to inject a voltage here as R7 is pulling it up to 3.3v. The recommendation is to connect a LM4040 3v shunt voltage reference (similar to a zener diode) from VREF to GND. An existing onboard resistor (R7) sources the current and the LM4040 clamps VREF to 3v. If you have a 3v or even a 2.7v zener you could try that,but the accuracy and noise won't be as good. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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