SAMC21N Xplained Pro has several resistors and jumpers that can be removed/cut to disconnect I/O pins of the ATSAMC21N18A from connectors and on-board ICs and to disconnect/measure power to different sections.
| Designator | From | To | Comment |
|---|---|---|---|
| R313 | PA14 | Arduino shield D3 | Remove when using external crystal |
| R314 | PA15 | Arduino Shield D5 | |
| 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 | PC12 MISO | EDBG MISO | |
| R618 | PB12 | EDBG GPIO0 | |
| R619 | PA22 | EDBG GPIO1 | |
| R620 | PC24 | 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
| Designator | From | To | Comment |
|---|---|---|---|
| J101 | VCC_TARGET_X_P3V3_P5V0 | VCC_MCU_P3V3_P5V0 | Remove this jumper (JS100) to measure current to the MCU section |
| J102 | VCC_P5V0 (pin 1) and VCC_P3V3 (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 | VCC_P3V3_TARGET | VCC_P3V3 | Cut this jumper to measure current to the Target and MCU sections. The footprint is 0603 sized. |
| J105 | 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. |
| 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 | CAN0 device, Standby pin | GND | Cut this jumper to explore the standby functionality of the CAN 0 transceiver (ATA6561). The footprint is 0603 sized. |
| J506 | CAN1 device, Standby pin | GND | Cut this jumper to explore the standby functionality of the CAN 1 transceiver (ATA6561). The footprint is 0603 sized. |
Figure 3. Jumpers Top
Figure 4. Jumpers Bottom
