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Support Forum » Pin Voltage and Reading the Data sheet
July 09, 2009 by sgmaniac1255 |
im working on my Tuner protect, and the thought crossed my mind.
i looked in the Data sheet and found the Electrical Characteristics section with the table that has the info i wanted. but i hit a technical stumble block. the chart says 0.6Vcc min to be read High. does this mean 0.6 Volts, or (0.6 * Vcc)? PS. is there a data sheet for the Buzzer that came with the kit? |
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July 09, 2009 by mrobbins (NerdKits Staff) |
Hi sgmaniac1255, It means (0.6 * Vcc) or about 3 volts. If others are curious, I wanted to point out that you are referring to Table 28.2 on page 304 of the ATmega168 datasheet. To summarize, for a Vcc=5 volts as we have in the provided setup, the bit is read "0" if Vin < 1.5 volts, and the bit is read as "1" if Vin > 3.0 volts. The range in between those voltages, between 1.5 and 3.0 volts, is an undefined region (might be 0 or 1), and this allows for some manufacturing variation. Sorry, I don't have any datasheet for the piezoelectric buzzer at this time. Mike |
July 09, 2009 by sgmaniac1255 |
thank you for the quick reply. that's what i thought, but wasn't sure... its kind of obvious now that you mention it. thanks again |
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