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Evaluation Kit Hardware
4-6
SAM4S-EK Development Board User Guide
11139A–ATARM–29-Nov-11
4.3.8
RS232
SAM4S-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
4.3.9
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
4.3.10
Display Interface
The SAM4S-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.
4.3.11
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 SAM4S communicates with the LCD through PIOC where an 8-bit parallel “8080-like” protocol data
bus has to be implemented by software.
USART
RXD1
TXD1
RTS1
CTS1
PA25
PA24
PA21_232
PA22
PA23
PA21
PA21_232
PA21_485
FGND
DGND
+3V3
DGND
+3V3
+3V3
DGND
R36
0R
R36
0R
C34
100nF
C34
100nF
C35
100nF
C35
100nF
C36
100nF
C36
100nF
R32
47K
R32
47K
MN5
ADM3312EARU
MN5
ADM3312EARU
C1+
6
C1-
20
C2+
2
C2-
4
C3+
24
C3-
22
VCC
3
V+
1
V-
21
GND
23
SD
19
EN
5
T1IN
7
T1OUT
18
R1IN
15
R1OUT
10
T2IN
8
T2OUT
17
R2IN
14
R2OUT
11
T3IN
9
T3OUT
16
R3IN
13
R3OUT
12
R38
0R
R38
0R
JP31
JP31
1
2
3
C31
4.7uF
C31
4.7uF
C32
100nF
C32
100nF
R35
0R
R35
0R
C37
100nF
C37
100nF
C33
100nF
C33
100nF
J5
J5
5
4
3
2
1
9
8
7
6
10
11
R34
0R
R34
0R
R33
0R
R33
0R
R31
0R
R31
0R
R37
47K
R37
47K
RS 485
RXD1
TXD1
RTS1
CTS1
PA22
PA24
PA25
PA21_485
DGND
+3V3
+3V3
+3V3
DGND
FGND
JP28
Header2 nm
JP28
Header2 nm
MN4
ADM3485ARZ
MN4
ADM3485ARZ
RO
1
RE
2
DE
3
DI
4
VCC
8
GND
5
A
6
B
7
R28
0R
R28
0R
R30
0R nm
R30
0R nm
J4
J4
1
2
3
R29
120R
R29
120R
C30
100nF
C30
100nF
R26
0R
R26
0R
JP11
Header2
JP11
Header2
JP12
Header2
JP12
Header2
JP10
Header2
JP10
Header2
R27
0R
R27
0R
R23
10K
R23
10K
R25
0R nm
R25
0R nm
R24
0R nm
R24
0R nm