3.2
Curiosity Nano Standard Pinout
The 12 edge connections closest to the USB connector on Curiosity Nano boards have a standardized pinout. The
program/debug pins have different functions depending on the target programming interface, as shown in the table
and figure below.
Table 3-3. Curiosity Nano Standard Pinout
Debugger Signal
Target MCU
Description
ID
—
ID line for extensions
CDC TX
UART RX
USB CDC TX line
CDC RX
UART TX
USB CDC RX line
DBG0
UPDI
Debug data line
DBG1
GPIO1
debug GPIO1
DBG2
GPIO0
debug GPIO0
DBG3
RESET
Reset line
NC
—
No connect
VBUS
—
VBUS voltage for external use
VOFF
—
Voltage Off input. Disables the target regulator and
target voltage when pulled low.
VTG
—
Target voltage
GND
—
Common ground
Figure 3-3. Curiosity Nano Standard Pinout
USB
DEBUGGER
PS LED
NC
ID
CDC RX
CDC TX
DBG1
DBG2
VBUS
VOFF
DBG3
DBG0
GND
VTG
CURIOSITY NANO
3.3
Power Supply
The board is powered through the USB port and contains two LDO regulators, one to generate 3.3V for the on-board
debugger, and an adjustable LDO regulator for the target microcontroller AVR128DA48 and its peripherals. The
voltage from the USB connector can vary between 4.4V to 5.25V (according to the USB specification) and will limit
the maximum voltage to the target. The figure below shows the entire power supply system on AVR128DA48
Curiosity Nano.
AVR128DA48 Curiosity Nano
Curiosity Nano
©
2020 Microchip Technology Inc.
User Guide
DS50002971A-page 13
