4.1
Power Sources
The ATtiny817 Xplained Mini kit can be powered by a USB or an external voltage input VIN. The default power
source is 5.0V from a USB. The USB port is protected with a 500 mA PTC resettable fuse.
The ATtiny817 is powered from the 5.0V USB voltage by default.
The figure below shows the possible kit power supply connections.
Figure 4-2. Power Supply Block Diagram
Power source
Power switch
Power converter
Power consumer
External input
5V
mEDBG USB
Regulator 3.3V
Input select
jumper
0R
VCC_P5V0
Target select
jumper
0R
mEDBG
&
Target
VCC_P5V0
VCC_P3V3
The input voltage select jumper (J102, 3-pin header footprint) can be soldered in to select between power from the
USB port or the VIN pin on the Arduino power header footprint. By default, the selector is bypassed with a 0Ω resistor
(R103) to connect the USB voltage to the on-board 3.3V/150 mA regulator and target voltage select header.
The target voltage select jumper (J100, 3-pin header footprint) can be soldered in to select between the on-board
3.3V regulator or the voltage from the input voltage select jumper (J102). The selector is bypassed with a 0Ω resistor
(R100) to connect the kit input voltage to the ATtiny817 and mEDBG.
Important:
If the target voltage and input voltage select headers are soldered in and used with a jumper,
the bypass 0Ω resistors have to be removed to avoid contention.
4.2
Connectors
4.2.1
ATtiny817 Xplained Mini Arduino Compatible Footprints
The ATtiny817 Xplained Mini has a pin-out that is compatible with Arduino shields, which can be mounted in the
marked positions (J200, J201, J202, J203, and J204).
Table 4-1. J200 ISP/SPI Header
J200
ATtiny817 Pin
Arduino Numbering
Functions
Comment
1
PC1
MISO
SPI MISO
2
VCC
VCC_P5V0
3
PC0
SCK
SPI SCK
4
PC2
MOSI
SPI MOSI
5
PC5
RESET
GPIO
6
GND
GND
GND
ATtiny817 Xplained Mini
Hardware User Guide
©
2019 Microchip Technology Inc.
User Guide
DS50002657B-page 12
