Atmel ATSAM3N-EK Hoja De Datos

Evaluation Kit Hardware

4-4

SAM3N-EK Development Board User Guide

11080C–ATARM–30-Mar-11

Supply Controller). The NRST pin integrates a permanent pull-up resistor of about 100 kOhm to VDDIO.
On the SAM3N-EK board, the NRST signal is connected to the JTAG port.

4.3.5

Power Supply and Management

The SAM3N-EK board is supplied with an external 5V DC block through the J1 socket. It is protected by
a PolyZen diode MN3. The PolyZen protects the board in the case of an incorrect power supply
connection.

The LDO regulator MN4 is used for the 3.3V main supply. It powers all the 3.3V components on the
board.

Figure 4-4.

Power Block

The SAM3N4/2/1 product series has different types of power supply pins:

VDDIN pin: Power for the internal voltage regulator, ADC, DAC, and analog comparator power
supplies. This voltage ranges from 1.8V to 3.6V.

VDDIO pin: Powers the Peripheral I/O lines, Backup part, 32 kHz crystal oscillator and oscillator pads.
This voltage ranges from 1.62V to 3.6V.

VDDOUT pin: Output of the internal voltage regulator.

VDDCORE pin: Powers the core, including the processor, the embedded memories and the
peripherals. This voltage ranges from 1.62V to 1.95V.

VDDPLL pin: Powers the PLL, the Fast RC and the 3 to 20 MHz oscillators. This voltage ranges from
1.62V to 1.95V.

4.3.6

UART

The Universal Asynchronous Receiver Transmitter features a two-pin UART that can be used for com-
munication and trace purposes. It offers an ideal channel for in-situ programming solutions. This UART
is associated with two PDC channels to reduce the processor time on packet handling.

The two-pin UART (TXD and RXD only) is buffered through an RS232 Transceiver MN8 and brought to
the DB9 male connector J4.

+3V3

+5V

DGND

C25
1uF

C29
10uF 0805

MP179P 2.1mm

1
2

C28
22uF

MN4
LP38692MP-3.3

VIN

VOUT

VEN

GND

MN3
ZEN056V130A24LS

C27
100nF

C26
10uF 0805