ATSAM4S-EK datasheet(13/49 Pages) ATMEL

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Evaluation Kit Hardware

SAM4S-EK Development Board User Guide

4-5

11139A–ATARM–29-Nov-11

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.

solder a shunt resistor in place of R25 (a solder drop will do).

+3V3

DGND

+3V3

FGND

PA10

PA9

C39

100nF

C39

100nF

C40

100nF

C40

100nF

TP5

SMD

TP5

SMD

R46

100K

R46

100K

C38

100nF

C38

100nF

TP6

SMD

TP6

SMD

C41

100nF

C41

100nF

R47

R48

C42

100nF

C42

100nF

MN6

MAX3232CSE

MN6

MAX3232CSE

T1IN

T2IN

R1OUT

R2OUT

T1OUT

T2OUT

R1IN

R2IN

V+

C1+

C1-

C2+

C2-

V-

VCC

GND

R45

100K

R45

100K

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