SHT11 Temprature is not accurate!

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Sharagim

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Hi,
I am trying to use SHT11 with xmega, I can read values and check CRC.
But returned temperature value is not accurate, with 3.3 it is about "0.7", "0.8" higher and with 5V this offset is even more.
To prevent self heating I set 10sec delay between measurements. I tried to give voltage only before measurement request and remove it after getting the value, but there is no significant changes.
 

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