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You are here: Home / Replies /  Your teacher is right ! The

 Your teacher is right ! The

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Projects › Projects › Problem of Celsius and Fahrenheit scale digital thermometer using 8051 microcontroller (AT89C51) ›  Your teacher is right ! The

May 19, 2012 at 6:15 pm #7857
AJISH ALFRED
Participant

 

Your teacher is right ! The internal gain of pin 9 of 0804 is 2. But somewhere in the datasheet I found that “voltage below 2.5 can be applied to pin 9″.

To get a reference voltage of exact 5V, all you have to do is to leave the pin 9 unconnected.

Sample circuits found in the datasheet also do it this way!

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