8.

Hardware Revisions and Known Issues

8.1.

Identifying Product ID and Revision

The revision and product identifier of Xplained Pro boards can be found in two ways; either through Atmel

Studio or by looking at the sticker on the bottom side of the PCB.

By connecting an Xplained Pro MCU board to a computer with Atmel Studio running, an information

window will pop up. The first six digits of the serial number, which is listed under kit details, contain the

product identifier and revision. Information about connected Xplained Pro extension boards will also

appear in the Atmel Kit's window.

The same information can be found on the sticker on the bottom side of the PCB. Most kits will print the

identifier and revision in plain text as A09-nnnn\rr, where nnnn is the identifier and rr is the revision.

Boards with limited space have a sticker with only a QR-code, which contains a serial number string.

The serial number string has the following format:

"nnnnrrssssssssss"

n = product identifier

r = revision

s = serial number

The product identifier for SAM R21 Xplained Pro is A09-2127.

8.2.

Revision 3

Revision 3 of SAM R21 Xplained Pro is the initial released version.

The VDDCORE capacitor C312 is mounted as 100nF on the SAM R21 Xplained Pro evaluation kit, while

the ATSAMR21G18A datasheet recommends 1µF. Using 100nF for VDDCORE decoupling may create

unwanted noise / ripple on the VDDCORE voltage.

Fix/Workaround:

Use a 1µF capacitor for new designs.

Atmel SAM R21 Xplained Pro [USER GUIDE]

Atmel-42243D-SAM-R21-Xplained-Pro_User Guide-04/2016

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