Crystals

The SAM B11 Xplained Pro kit contains one mounted 32.768kHz crystal that can be used as clock sources for the SAM B11. The crystal has cut-straps next to them that can be used to measure the oscillator safety factor. This is done by cutting the strap and adding a resistor across the strap. Information about oscillator allowance and safety factor can be found in application note AVR41001, information about clock calibration and compensation can be found in application note AT03155.

The footprint for the external crystal is based on the Fox FQ5032B series

Table 1. External 32.768kHz Crystal
SAM B11 pin Function Shared functionality
RTC_CLKP XIN32 -
RTC_CLKN XOUT32 -