Schematics
UM1668
52/70
DocID025151 Rev 2
Figure 33. RS-232 and IrDA
STMicroelectronics
Title:
Number:
Rev:
Sheet
of
B.2(PCB.SCH)
Date:
7/24/2013
RS232/IrDA_TX
RS232/IrDA_RX
SD
5
TxD
3
GND
8
Anode
(VCC2)
1
Cathode
2
RxD
4
VCC1
6
NC
7
U1
T
F
DU6300
+3V3
C4
4.7uF
C3
4.7uF
IrDA
3
2
1
JP7
MB1045
10
16
STM324x9I-EVAL
RS232&IrDA
C2+
1
C2-
2
V-
3
R1IN
4
R2IN
5
R3IN
6
R4IN
7
R5IN
8
T1OUT
9
T2OUT
10
T3OUT
11
T3IN
12
T2IN
13
T1IN
14
R5OUT
15
R4OUT
16
R3OUT
17
R2OUT
18
R1OUT
19
R2OUTB
20
R1OUTB
21
nSHDN
22
nEN
23
C1-
24
GND
25
VCC
26
V+
27
C1+
28
U4
ST3241EBPR
+3V3
+3V3
PA9
PA10
RXD
TXD
R2
5.1
R1
47
C2
100nF
C1
100nF
RS232
C
3
5
100nF
C
2
8
100nF
C132
100nF
C34
100nF
C31
100nF
1
6
2
7
3
8
4
9
5
CN8
DB9-m
ale
USART1
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