Crystals

SAM E54 Xplained Pro has a 32.768 kHz and a 12 MHz crystal that can be used as clock source for the SAM E54 device. There are cut-straps located close to the crystals that can be used to measure the oscillator safety factor. This is done by cutting the strap and adding a resistor across the strap. More information about oscillator allowance and safety factor are available in the AVR4100 application note.

The 32.768 kHz crystal on SAM E54 Xplained Pro is a Kyocera Crystal Device Corporation ST3215SB32768A0HPWBB 5pF crystal. The crystal has been matched to be driven in high drive mode by the SAM E54.

The 12 MHz crystal on SAM E54 Xplained Pro is a Kyocera Crystal Device Corporation CX3225CA12000D0KPSC1. The crystal has been matched to be driven with Automatic Loop Control enabled in the SAM E54.

Both crystals have been formally tested and matched to the SAM E54 by Kyocera. The test reports are available in the design documentation distributed with this document for SAM E54 Xplained Pro.

Info: Kyocera Crystal Device Corporation crystals that are matched with specific products can be found on their web site: http://prdct-search.kyocera.co.jp/crystal-ic/?p=en_search/

Table 1. External 32.768kHz Crystal
SAM E54 pin	Function
PA00	XIN32
PA01	XOUT32

Table 2. External 12MHz Crystal
SAM E54 pin	Function
PB22	XIN1
PB23	XOUT1