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USBTO232
USB-to-COM Port Adapter Board User Guide
30 ______________________________________________________________________________________
Figure 28. USBTO232 Schematic
MAX213
P1
VCC
VCC
VCC30
5
3
1
9
20
23
22
13
14
17
19
VCCI0
U1
FT232RL
U2
USBDM
USBDP
N.C.
N.C.
OSCI
OSCO
CBUS4
DCD#
RI#
CTS#
DTR#
AGNDGND
25 7182126
GND GND TEST
SLEEP#
DCD#
RI#
CTS#
DTR#
12
10
6
11
2
JU1
1
2
4
3
FB1
C1
0.01µF
C2
47pF
C11
0.1µF
C3
47pF
P1-1
P1-2
16
15
8
24
27
28
P1-3
P1-4
USB TYPE B
H1
HEADER 8 PIN
C7
0.1µF
C6
0.1µF
C10
1µF
C4
0.1µF
C5
0.1µF
H1-1
H1-2
H1-3
H1-4
H1-5
H1-6
H1-7
H1-8
VCC
VCC
C8
0.1µF
C9
4.7µF
T3
OUT
27
CTS
VCC
VCC
VCC
V
CC
CTS#
SLEEP#
T1
OUT
T2
OUT
R2
IN
DTR
TXDATA
RTS
RXDATA
1
2
3
4
R2
OUT
5
T2
IN
6
T1
IN
7
R1
OUT
8
R3
IN
28
T4
OUT
26
R3
OUT
23
R4
IN
24
EN
21
T4
IN
20
T3
IN
22
R4
OUT
25
SHDN
R1
IN
DSR
9
11
13
GND
10
C1-
14
C1+
V+
12
RI
RI#
DTR#
19
R5
OUT
18
R5
IN
DCD#
DCD
CBUS0
17
V-
16
C2-
15
C2+
JU2
1
2
3
D1
R1
270Ω
VCC30
JU3
1
2
3
D2
R2
270Ω
RESET#
RESET#
RXD
RTS#
TXD
DSR#
VCC
CBUS0
CBUS1
CBUS2
CBUS3
3V3OUT
C12
0.1µF
VCC30
CBUS3
CBUS2
CBUS1
P2
DB9 TYPE DTE
P2-1
P2-2
P2-3
P2-4
P2-5
P2-6
P2-7
P2-8
P2-9
CBUS0
CBUS1
DCD
RXDATA
TXDATA
DTR
DSR
RTS
CTS
RI