adding a resistor across the strap. Information about oscillator allowance and safety factor can be found
in appnote AVR4100. Information about clock calibration and compensation can be found in appnote
AT03155.
The footprint for the external crystal is based on the Epson
®
TSX-3225 series.
Table 4-15 External 32.768kHz Crystal
SAM C21 pin Function Shared functionality
PA00 XIN32 -
PA01 XOUT32 -
Table 4-16 External Crystal Footprint
SAM C21 pin Function Shared functionality
PA14 XIN EXT3
PA15 XOUT EXT3 and User LED
4.3.4. CAN
ATSAMC21J18A has two CAN modules that performs communication according to ISO11898-1 (Bosch
CAN specification 2.0 part A,B) and Bosch CAN FD specification V1.0.
CAN0 is connected to an on-board ATA6561 CAN physical-layer transceiver. Table 4-17 ATA6561
Connections on page 20 shows connections between the ATSAMC21J18A and the ATA6561.
The CAN differential signals are connected to a 1 x 2, 100 mil pin-header labeled CAN.
Table 4-17 ATA6561 Connections
SAM C21pin Function ATA6561 function Shared functionality
PA24 CAN0TX TXD -
PA25 CAN0RX RXD -
Table 4-18 CAN Header
CAN header pin Function
1 CANH
2 CANL
4.3.5. LIN
An ATA663211 LIN transceiver is mounted on the kit to convert the LIN signals from the SERCOM
module in the SAM C21 device. The LIN compatible signals are available at a 3-pin header.
Atmel SAM C21 Xplained Pro [USER GUIDE]
Atmel-42460C-SAM C21 Xplained Pro_User Guide-10/2015
20
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