Figure 3-3. Target Regulator Safe Operation Area
3.3.2
External Supply
PIC18F47K42 Curiosity Nano can be powered by an external voltage instead of the on-board target regulator. When
the Voltage Off (
VOFF
) pin is shorted to ground (
GND
) the on-board debugger firmware disables the target regulator,
and it is safe to apply an external voltage to the VTG pin.
WARNING
Applying an external voltage to the VTG pin without shorting
VOFF
to
GND
may cause permanent damage
to the kit.
WARNING
Absolute maximum external voltage is 5.5V for the on-board level shifters, and the standard operating
condition of the PIC18F47K42 is 2.3-5.5V. Applying a higher voltage may cause permanent damage to the
kit.
Programming, debugging, and data streaming are still possible with an external power supply: The debugger and
signal level shifters will be powered from the USB cable. Both regulators, the debugger, and the level shifters are
powered down when the USB cable is removed.
3.3.3
VBUS Output Pin
PIC18F47K42 Curiosity Nano has a VBUS output pin which can be used to power external components that need a
5V supply. The VBUS output pin has a PTC fuse to protect the USB against short circuits. A side effect of the PTC
fuse is a voltage drop on the VBUS output with higher current loads. The chart below shows the voltage versus the
current load of the VBUS output.
PIC18F47K42 Curiosity Nano
Curiosity Nano
©
2019 Microchip Technology Inc.
User Guide
DS50002899B-page 11
