Atmel SAM D20 Xplained Pro [USER GUIDE]
42102C-MCU-02/2014
13
5.
Hardware Revision History and Known Issues
5.1
Identifying Product ID and Revision
The revision and product identifier of Xplained Pro boards can be found in two ways, through Atmel Studio or
by looking at the sticker on the bottom side of the PCB.
By connecting a 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 Kits
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 kit identifier for SAM D20 Xplained Pro is 1873.
5.2
Revision 5
Revision 5 of SAM D20 Xplained Pro has revision C of the SAMD20J18A device mounted
Known issues
●
VDD
CORE
decoupling capacitor
The VDDC
CORE
output pin on SAMD20J18A has two decoupling capacitors, one 100nF and one 4.7μF.
This might lead to a high power consumption when leaving STANDBY sleep mode and the regulator
returns to normal operating mode.
Fix/Workaround:
●
Change the 4.7μF tantalum capacitor (C315) to 1μF ceramic capacitor.
5.3
Revision 4
Revision 4 of SAM D20 Xplained Pro is the initial released version.
Known issues
●
PTC in self-capacitance mode
Revision B of the SAM D20 is mounted on this kit. The two lowest gain settings are not selectable and an
attempt by the QTouch Library to set enable of these may result in a higher sensitivity than optimal for the
sensor. The PTC will not detect all touches. This errata does not affect mutual-capacitance mode which
operates as specified.
Fix/Workaround:
●
Use SAM D20 revision C or later for self-capacitance capacitive touch sensing. These are mounted on
revision 5 or later of the SAM D20 Xplained Pro kit.
●
VDD
CORE
decoupling capacitor
The VDDC
CORE
output pin on SAMD20J18A has two decoupling capacitors, one 100nF and one 4.7μF.
This might lead to a high power consumption when leaving STANDBY sleep mode and the regulator
returns to normal operating mode.
Fix/Workaround:
●
Change the 4.7μF tantalum capacitor (C315) to 1μF ceramic capacitor.
