I bought a few 32.768 KHz crystals so I could use them on an AT89LP4052 MCU. This chip has an internal crystal oscillator that I've successfully been using with crystals of between 4 and 22 MHz, but this is the first time I've attempted to use a crystal with such low frequency. And unfortunately, I couldn't make it work.
It turns out that this type of crystal is of the "flexural", or "tunning fork" type, and it appears to function under a different principle from the other traditional XO (or standard) crystals. And also, it seems that at this low frequencies this is the only type of crystal available out there.
I'd like to avoid using an external oscillator for this application, because they normally don't work within the wide voltage range that I'll be using (2.4 to 5.5V) and because they consume too much current (about 3mA) compared to the MCU chip itself, which consumes about 7mA.
Is there a way to adapt this sort of crystal so that it could work with my chip's internal oscillator?
It turns out that this type of crystal is of the "flexural", or "tunning fork" type, and it appears to function under a different principle from the other traditional XO (or standard) crystals. And also, it seems that at this low frequencies this is the only type of crystal available out there.
I'd like to avoid using an external oscillator for this application, because they normally don't work within the wide voltage range that I'll be using (2.4 to 5.5V) and because they consume too much current (about 3mA) compared to the MCU chip itself, which consumes about 7mA.
Is there a way to adapt this sort of crystal so that it could work with my chip's internal oscillator?