If other voltages are required, the kit must be disconnected from the USB to avoid damage or contention
to the USB power. The mEDBG must also be disconnected from the target section of the board. The
board can be power by applying a voltage to one of the power connections on the board according to the
table below. To avoid any power leakage through the mEDBG, this should also be disconnected by
removing the resistors shown in
on page 8. For placement of power
Xplained Nano Standard Pin-Out
Table 3-2. Power Connections
Power
Connection
Description
VUSB
USB Voltage output when USB is connected (behind a PTC fuse). Can be used as
power input when USB is not used.
VREG
Regulated voltage from VUSB. If the kit does not have a regulator, this is directly
connected to VUSB.
VCC
Target voltage supply. By default connected to VREG through a 0Ω resistor. Apply
external voltage here if the resistor is removed.
Figure 3-1. Power Supply Block Diagram
USB
Target MCU
PTC
Power source
Power connection
Power consumer
0-ohm Resistor
VUSB /
VREG
VCC
mEDBG
3.3.
Xplained Nano Standard Pin-Out
Xplained Nano kits have a standard pin-out in the mEDBG section as shown in the tables and figure
below. The program/debug pins will change depending on the target interface, but will remain at the same
locations.
Xplained Nano kits have a target section where all I/O pins will be available and fanned out. Except for
the
VCC
and
GND
pins with fixed positions, there are no defined pin functions in this area. The first pin in
the target area is the
VCC
pin, located right next to the
VREG
pin of the standard section. The last pin is
GND
, and it's located next to the
CDC RX
pin in the stadard section. For reference, see figure below.
3.3.1.
Standard Pin-Out for TPI
Table 3-3. Xplained Nano mEDBG Standard Pin-Out
Pin number
Name
Description
1
RST
Reset line
2
TPID
TPI Program data line
3
TPIC
TPI Program clock output
Atmel ATtiny104 Xplained Nano [USER GUIDE]
Atmel-42671A-ATtiny104-Xplained-Nano_User Guide-02/2016
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