The oscillator works in parallel resonant mode of the crystal. When a 32768Hz quartz crystal is connected to pins XIN32K and XOUT32K, the oscillator will output 32KHz and 1Hz square waves, with the ...
"This is a 32768Hz crystal oscillator specifically designed for ultra-low power application. The sole power supply is1.8V, but it can be as low as 1.4V while the oscillator still functions properly.
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