Kit Modifications

SAM C21 Xplained Pro has several resistors and jumpers that can be removed/cut to disconnect I/O pins of the ATSAMC21J18A from connectors and on-board ICs and to disconnect/measure power to different sections.

Table 1. Resistors
Designator From To Comment
R313 PA14 EXT3 pin 7 Remove when using external crystal
R314 PA15 EXT3 pin 8 and LED
R609 RESETN RESET NET Remove to disconnect the RESETN pin from the reset system
R607 PB11 RX CDC RX Remove to disconnect pins from the EDBG level shifters
R610 RESET NET EDBG RESET
R611 PA31 SWDIO EDBG SWDIO
R612 PA30 SWCLK EDBG SWCLK
R614 PB02 MISO EDBG MISO
R618 PB12 EDBG GPIO0
R619 PB16 EDBG GPIO1
R620 PB17 EDBG GPIO2
R621 PA28 EDBG GPIO3
R800 RESETN Arduino shield RESET Remove to disconnect the reset system from the Arduino shield connectors
Figure 1. Resistors Top
Figure 2. Resistors Bottom
Table 2. Jumpers
Designator From To Comment
J101 VCC_TARGET_X_P3V3_P5V0 VCC_TARGET_P3V3_P5V0 Remove this jumper (JS100) to measure current to the MCU section
J102 VCC_IN_P5V0 (pin 1) and VCC_P3V3_TARGET (pin 3) VCC_TARGET_SWITCH_P3V3_P5V0 Use this jumper (JS101) to select either 5.0V or 3.3V voltage to the Target section. Default setting in production is 5.0V.
J103 VCC_IN_P5V0 VCC_P5V0 Cut this jumper to measure current from the 5.0V input MUX section. The footprint is 0603 sized.
J104 3.3V linear regulator output for EDBG section VCC_EDBG_P3V3 Cut this jumper to measure current to the EDBG section. The footprint is 0603 sized.
J105 3.3V linear regulator output for Target and MCU sections VCC_P3V3 Cut this jumper to measure current to the Target and MCU sections. The footprint is 0603 sized.
J106 VCC_TARGET_X_P3V3_P5V0 VCC_TARGET_P3V3_P5V0 Cut this jumper to measure current to the Target section. The footprint is 0603 sized.
J300 PA15_XOUT 16MHz crystal pin Cut this jumper and mount resistors to find 16MHz crystal oscillator safety factor. The footprint is 0603 sized.
J501 LIN signal Pull-up resistor to VS voltage Mount this jumper (JS501) to set the LIN transceiver as Master node. Default setting in production is mounted.
J502 VS_LIN VCC_TARGET_P3V3_P5V0 Mount this jumper (JS500) to power the LIN transceiver from VCC_TARGET_P3V3_P5V0. Remove this jumper when the LIN transceiver is powered from the LIN bus. Default setting in production is mounted.
J504 CAN device, Standby pin GND Cut this jumper to explore the standby functionality of the CAN transceiver (ATA6561). The footprint is 0603 sized.
Figure 3. Jumpers Top
Figure 4. Jumpers Bottom