Maxim Integrated USBTO232 - Manual (Page 30)

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# AGND
GND
25
7
182
12
6
GND
GND
TEST
SLEEP#
DCD#
RI#
CTS# DTR#
12 10 6 11 2
JU1
1
2 4
3
FB1 C1
0.01
µ
F
C2
47pF
C11 0.1
µ
F
C3
47pF
P1-1 P1-2
16 15
8
24 27 28
P1-3 P1-4
USB TYPE B
H1
HEADER 8 PIN
C7 0.1
µ
F
C6 0.1
µ
F
C10 1µ
F
C4
0.1
µ
F
C5
0.1
µ
F
H1-1 H1-2 H1-3 H1-4 H1-5 H1-6 H1-7 H1-8
VCC
VCC
C8
0.1
µ
F
C9
4.7
µ
F
T3
OUT
27
CTS
VCC
VCC
VCC
V CC
CTS# SLEEP#
T1
OUT
T2
OUT
R2
IN
DTR
TXDA
TA
RT
S
RXDA
TA
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 270
Ω
VCC30
JU3
1
2
3
D2
R2 270
Ω
RESET#
RESET#
RXD R TS# TXD
DSR# VCC
CBUS0 CBUS1 CBUS2 CBUS3 3V3OUT
C12 0.1
µ
F
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
RXDA
TA
TXDA
TA
DTR DSR RT
S
CTS
RI