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14
ATSAM4C-EK [USER GUIDE]
11251A–ATARM–16-Dec-13
3.5
Communication Interfaces
3.5.1
Serial Port USART2 RS232
The USART2 is buffered with one RS-232 Transceiver ADM3312E (Analog Devices) and is connected to a DB9
connector. A classic implementation RS232 transceiver selection should include double source capability. The USART2
connector with RTS/CTS handshake signal support is connected to the RS232 transceiver.
Features:
One RS232 transceiver connected to RXD2, TXD2, RTS2, and CTS2
One DB9 male connector
Required resistors and capacitors
Figure 3-10.
USART2 RS232 Schematic
3.5.2
Serial Port USART2 RS485
The USART2 is buffered with an Analog Devices ADM3485 RS-485/RS-422 transceiver and is connected to a 3-point
jumper.
Features:
One RS485 transceiver connected to RXD2, TXD2 and RTS2, CTS2
One 3-point connector
Required resistors and capacitors
Figure 3-11.
USART2 RS485 Schematic
Male
Straight Angle
USART2
(RXD2)
(TXD2)
(RTS2)
(CTS2)
PA15
PA14
PA9_232
PA10
VDDMAIN
VDDMAIN
VDDMAIN
FGND
R28
0R
C51
100nF
R26
0R
R
C47
4.7µF
MN3
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
R31
0R
J3
J3
5
4
3
2
1
9
8
7
6
10
11
C49
100nF
C53
100nF
C48
100nF
R33
0R
C50
100nF
R35
0R
R34
47K
R25
R30
0R
C52
100nF
Do Not Populate
47K/DNP
(RXD2)
(TXD2)
(RTS2)
(CTS2)
RS 485
PA15
PA9_485
PA10
PA14
PA9
PA9_232
PA9_485
VDDMAIN
VDDMAIN
VDDMAIN
FGND
R32
0R
R37
120R
R23
10K
R29
0R
R27
0R
J4
1
2
3
R36
0R
MN4
ADM3485ARZ
RO
1
RE
2
DE
3
DI
4
VCC
8
GND
5
A
6
B
7
C54
100nF
R38
R24
JP15
1
2
3
Do Not Populate
Do Not Populate
JP14
3.3K/DNP
JP16
3.3K/DNP
JP17
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