4.2 Current Measurement

The power to the target controller ATtiny104 is connected from the VREG supply to the targets VCC supply with a 0Ω resistor, as shown in the figure below. To measure the power consumption of the device, remove the 0Ω resistor and replace it with an ammeter. The ammeter can be connected between the VREG and VCC pads for easy measurement.

Tip: To connect the two power domains again, solder in a 0Ω resistor on the footprint or a 100-mil header on the header footprint at the edge of the board and place a jumper between VREG and VCC.
CAUTION: Removing the resistor while the kit is powered without an ammeter or jumper may cause the ATtiny104 to be powered through its I/O pins. This may cause permanent damage to the device.
Figure 4-1. Current Measurement