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Re: [AVR-Chat] ADC accuracy in ATmega8535

2004-11-02 by Svenn Dahlstrøm

Hi Andrew
One way to get a good accuracy is to do a calibration.

Svenn :-)
----- Original Message -----
From: Andrew Lim
Sent: Tuesday, November 02, 2004 6:49 AM
Subject: [AVR-Chat] ADC accuracy in ATmega8535

Hi there,

I'm using ADC interrupt mode in my prototype board. Everything is running now but I'm facing accuracy problem. Can someone help me? I need my accuracy to be +/- 0.5%.

1. I have my AVCC connected to Vcc.

2. Aref not connected.

3.Set free running mode

4.REFS1 = 0 , REFS0 = 0 (Choosed AVCC with external cap at Aref) -> what if I dun have caps coupled between AVCC and Aref? Will it affect the accuracy?

Thanks.

Andrew

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