Hi,
I'm realizing a low Power Project with an LR123A Battery as a Power Source.
The Battery ranges from 3,2V to 2,75V discharged.
I don't want any boost circuit running at all times, to shorten the battery Life dramatically.
That's why I intend to Power the Arduino (Atmel Chip only) with the direct Battery Voltage, which seems to be possible:
(See Attachment Image)
But the varying Voltage alters the Clock Speed and frequency. And I do need it for Timekeeping purposes.
Is it possible to attach a different Crystal resonator to the clock input in a way that the frequency stays constant from 3.2V to 2.75V?
I'm new to Crystal Resonators and was hoping to gain some insight.
Thanks, Dave
But the varying Voltage alters the Clock Speed and frequency.
No! The crystal or resonator frequency doesn't automatically change with voltage.
At lower voltages the processor has to be slowed-down to run reliably. That's what the graph is showing you. If you are running at low voltages it's up to you to use a lower-speed clock. (And of course, you are still in the safe-operating-area if you use the same slower clock at higher voltages.)
