Atmel SAM4S-EK2 Atmel ATSAM4S-EK2 ATSAM4S-EK2 Ficha De Dados

Códigos do produto

ATSAM4S-EK2

Evaluation Kit Hardware

SAM4S-EK2 User Guide

4-5

11176A–ATARM–24-Sep-12

VDDIO pins:

Power for the Peripherals I/O lines.

The voltage ranges from 1.62V to 3.6V.

VDDOUT pin:

Output of the internal voltage regulator.

VDDCORE pins:

Power for the core, including the processor, embedded memories and peripherals.

The voltage ranges from 1.62V to 1.95V.

VDDPLL pin:

Power for the PLL A, PLL B and 12 MHz oscillator.

The voltage ranges from 1.62V to 1.95V.

Note:

VDDPLL should be decoupled and filtered from VDDCORE.

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.

This two-pin UART (TXD and RXD only) is buffered through an RS232 Transceiver MN6 and brought to
the DB9 male connector J7.

Figure 4-5.

UART

4.3.7

USART

The Universal Synchronous/Asynchronous Receiver Transmitter (USART) provides one full duplex uni-
versal synchronous/asynchronous serial link. The data frame format is extensively configurable (data
length, parity, number of stop bits) to support a broad range of serial communication standards. The
USART is also associated with PDC channels for TX/RX data access.

Note:

For design optimization purposes, both transmitters have been implemented on the same
PIO lines, that is PA21, 22, 23, 24, 25.

To avoid any electrical conflict, the RS485 transceiver is isolated from the receiving line PA21.

Should you need to implement an RS485 channel in place of the RS232, follow the procedure below:

make sure your software will permanently set PA23 to a high level - this will permanently disable the
RS232 receiver.

change JP31 to make sure that 2-3 pins are connected.

+3V3

DGND

+3V3

FGND

PA10
PA9

C39

100nF

C39

100nF

C40
100nF

TP5

SMD

TP5

SMD

R46
100K

C38
100nF

TP6

SMD

TP6

SMD

C41
100nF

R47

R48

C42
100nF

MN6
MAX3232CSE

T1IN

T2IN

R1OUT

R2OUT

T1OUT

T2OUT

R1IN

R2IN

V+

C1+

C1-

C2+

C2-

V-

VCC

GND

R45
100K