SAMC21 datasheet(19/46 Pages) ATMEL

19 / 46 page

Table 4-9. VCC_SEL Header

VCC_SEL header pin

Function

VCC_P5V0

VCC_TARGET

VCC_P3V3

4.2.4.

VREF Header

SAM C21 Xplained Pro has a 6-pin header labeled VREF on the board. This header can be used to

select / apply a voltage reference to the ADC, DAC, and SDADC. Jumpers can be used to tie SADC

VREF and ADC/DAC VREFT to the kit target voltage from pin 1-3 and 2-4, or external voltages can be

applied across pin 3-5 and 4-6.

Table 4-10. VREF Header

VREF header pin

Pin / Net

Function

VCC_AREF_P3V3_P5V0

Filtered kit target voltage

VCC_AREF_P3V3_P5V0

Filtered kit target voltage

PA04

SDADC voltage reference

PA03

ADC / DAC voltage reference

GND

Ground

GND

Ground

4.2.5.

DAC Header

SAM C21 Xplained Pro has a 2-pin header labeled DAC-OUT on the board that is connected to the DAC

output of the ATSAMC21J18A and ground.

Table 4-11. DAC Header

DAC header pin

Pin / Net

Function

Shared functionality

PA02

DAC0 output

EXT3

GND

Ground

4.2.6.

Current Measurement Header

An angled 1x2, 100mil pin-header marked with MCU current measurement is located at the upper edge of

the SAM C21 Xplained Pro. All power to the ATSAMC21J18A is routed through this header. To measure

the power consumption of the device remove the jumper and replace it with an ammeter.

Caution: Removing the jumper from the pin-header while the kit is powered may cause the

ATSAMC21J18A to be powered through its I/O pins. This may cause permanent damage to the

device.

4.2.7.

Cortex Debug Connector

SAM C21 Xplained Pro has a 10-pin 50-mil Cortex

® Debug Connector that can be used to attach external

debuggers to the ATSAMC21J18A.

Atmel SAM C21 Xplained Pro [USER GUIDE]

Atmel-42460D-SAM-C21-Xplained-Pro_User Guide-08/2016

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