User manual

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 Figure 3-3 Kit Modifications on page 8. For placement of power

connections, see Xplained Nano Standard Pin-Out on page 6.

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 MCUPTC

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