User Guide

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Debugger Signal ICSP Target Description

VTG - Target voltage

GND - Common ground.

DBG0 SWDATA Debug data line.

DBG3 nRESET Reset line

VOFF - Voltage Off input.

VBUS - VBUS voltage for external use.

Figure 3-1. Curiosity Nano Standard Pinout

3.3 Power Supply

The evaluation kit is powered through the USB port and contains two regulators for generating 3.3V for the debugger

and an adjustable regulator for the target. The voltage from the USB connector can vary between 4.4V-5.25V

(according to the USB specification) and will limit the maximum voltage to the target. The following figure shows the

entire power supply system on the SAM D21 Curiosity Nano.

Figure 3-2. Power Supply Block Diagram

SAM D21

Curiosity Nano

User Guide

DS70005409C-page 7

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