3.4 Target Current Measurement
Power to the PIC18F47K42 is connected from the on-board power supply and VTG pin through a 100-mil pin header cut Target Power strap marked with “POWER” in silkscreen (J101). To measure the power consumption of the PIC18F47K42 and other peripherals connected to the board, cut the Target Power strap and connect an ammeter over the strap.
Tip: A 100-mil pin header can be
soldered into the Target Power strap (J101)
footprint for easy connection of an ammeter. Once the ammeter is not needed anymore,
place a jumper-cap on the pin header.
Info: The
on-board level shifters will draw a small amount of current even when they are not in
use. A maximum of 10 µA can be drawn from the target power net, and an additional 2 µA
can be drawn from each I/O pin connected to a level shifter for a total of 20 µA.
Disconnect the on-board debugger and level shifters as described in Section Disconnecting the On-Board
Debugger and keep any I/O pin connected to a level shifter in
tri-state to prevent leakage.