ATSAM3S-EK【PDF 14/50 页】KIT EVAL FOR ATSAM3S4C

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Evaluation Kit Hardware

4.3.7.1

RS232

SAM3S-EK connects the USART1 bus (including TXD, RXD, RTS, CTS handshake signal controls and

EN command) to the DB9 male connector J5 through the RS232 Transceiver MN5.

Figure 4-6.

USART

MN5

+ 3 V 3

ADM 33 12EARU

3

VCC

C1+

6

C 3 1

4.7 u F

C 3 2

100nF

C 33

100nF

C 3 4

100nF

DGND

C 3 6

1

21

V+

V-

C1-

C2+

20

2

C 3 5

100nF

PA2 3

+ 3 V 3

R 3 1

R 3 2

47K

0R

100nF

2 3

19

5

GND

S D

EN

C2-

C 3 +

C 3 -

4

24

22

C 3 7

100nF

1

6

2

7

J5

PA22

PA21

PA24

PA25

+ 3 V 3

R 33

R 3 4

R 3 5

R 3 6

R 3 7

0R

0R

0R

0R

47K

7

10

8

11

9

12

T1IN

R1OUT

T2IN

R2OUT

T 3 IN

R 3 OUT

T1OUT

R1IN

T2OUT

R2IN

T 3 OUT

R 3 IN

18

15

17

14

16

1 3

R 38

0R

3

8

4

9

5

DGND

DGND

FGND

4.3.7.2

RS485

As noticed above, the USART1 is shared with the RS485 port, connected to the transceiver MN4, con-

nected to the 3-point connector J4. The design includes selectable jumpers for RS485 bus termination

resistors selection (JP10, JP11, JP12).

Figure 4-7.

RS485

+ 3 V 3

R2 3

+ 3 V 3

R24

PA2 3

DNP

MN4

ADM 3 4 8 5ARZ

+ 3 V 3

DNP

PA21

R25

DNP

1

RO

VCC

8

C 3 0

JP10

PA25

PA24

PA22

R26

R27

R2 8

0R

0R

0R

2

3

4

RE

DE

DI

GND

A

B

5

6

7

100nF

DGND

1

2

3

J4

4.3.8

Display Interface

R29

120R

JP11

JP12

R 3 0

DNP

DGND

FGND

The SAM3S-EK carries a TFT Transmissive LCD module with touch panel, FTM280C34D. Its integrated

driver IC is ILI9325. The LCD display area is 2.8 inches diagonally measured, with a native resolution of

240 x 320 dots.

4.3.8.1

4-6

LCD Module

The LCD module gets reset from the NRST signal. As explained, this NRST is shared with the JTAG port

and the push-button BP1. The LCD chip select signal is connected to NCS1; the jumper JP13 can dis-

connect it so that this PIO line is available for other custom usage.

The SAM3S communicates with the LCD through PIOC where an 8-bit parallel “8080-like” protocol data

bus has to be implemented by software.

SAM3S-EK Development Board User Guide

11031C–ATARM–30-Mar-11

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