• Remove the two jumpers from the on-board 3-pin current measurement headers (J101 and J102), and connect
the two center pins (pin 2) with a wire or an ammeter, as shown in
• Remove R404, R406, R407, R408, R414, R415, R416, R417, R420, R425, R426
• Optionally, cut J100 to remove power to the on-board current measurement headers (J101 and J102) from the
on-board regulator
shows all components that have to be removed from the bottom side of the PCB for operation at other
voltages. To locate the other components, see the assembly drawing in the section above. The kit can be supplied
with the desired voltage through the pins marked 3.3V (pin four) and GND (pin two) on the Xplained Pro power
header when the components are removed. To program and debug the ATtiny3217, the 2x5 50mil UPDI debug
connector has to be used with an external debugger.
Info:
Operating the ATtiny3217 on other voltages than 3.3V requires physical modifications on the kit
using a soldering iron and an external debugger for programming the ATtiny3217. The on-board current
measurement only works at 3.3V. The on-board LED is selected for 3.3V operation. The light level at 1.8V
operation is very low. To increase the emitted light level, the value of the series resistor can be lowered.
The EDBG functionality can be restored by re-soldering the removed components. If J100 was cut, a 0Ω
resistor can be soldered across the cut.
CAUTION
The voltage supplied through the power header is applied directly to the ATtiny3217 and the extension
headers. Applying a voltage higher than 5.5V may damage the board permanently.
Figure 4-6. ATtiny3217 Xplained Pro EDBG Disconnect
EDBG UPDI , I2C,
GPIO, CDC, and
SPI disconnect
Figure 4-7. ATtiny3217 Xplained Pro Current Measurement Headers
Related Links
3.5.2 Xplained Pro Power Header
4.2 Connectors
4.2.2 UPDI Debug Connector
ATtiny3217 Xplained Pro
Hardware User Guide
©
2020 Microchip Technology Inc.
User Guide
DS50002765B-page 22
