Future Technology Devices International Ltd FT4232H Quad High ...
Future Technology Devices International Ltd FT4232H Quad High ...
Future Technology Devices International Ltd FT4232H Quad High ...
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Document No.: FT_000060<br />
<strong>FT4232H</strong> QUAD HIGH SPEED USB TO MULTIPURPOSE UART/MPSSE IC<br />
Datasheet Version 2.09<br />
Clearance No.: FTDI#78<br />
4.3.2 RS422 Configuration<br />
Figure 4.2 illustrates how the <strong>FT4232H</strong> can be configured as a dual RS422 interface. The <strong>FT4232H</strong> can<br />
have all 4 channels connected as RS422, but only channel A and channel C are shown for clarity.<br />
<strong>FT4232H</strong><br />
PWREN#<br />
60<br />
4<br />
VCC<br />
14 SP491<br />
DB9-M<br />
RS422 Channel A<br />
SUSPEND#<br />
TXD<br />
RXD<br />
36<br />
16<br />
17<br />
5<br />
3<br />
2<br />
D<br />
R<br />
10<br />
9<br />
11<br />
12<br />
120R<br />
TXDM_A<br />
TXDP_A<br />
RXDP_A<br />
RTS#<br />
18<br />
6<br />
7<br />
RXDM_A<br />
CTS#<br />
DTR#<br />
DSR#<br />
DCD#<br />
RI#<br />
19<br />
21<br />
22<br />
23<br />
24<br />
4<br />
5<br />
3<br />
2<br />
D<br />
R<br />
14<br />
VCC<br />
SP491<br />
10<br />
9<br />
11<br />
12<br />
120R<br />
GND<br />
RTSM_A<br />
RTSP_A<br />
CTSP_A<br />
6<br />
7<br />
CTSM_A<br />
4<br />
VCC<br />
14 SP491<br />
DB9-M<br />
RS422 Channel C<br />
TXD<br />
RXD<br />
RTS#<br />
CTS#<br />
DTR#<br />
38<br />
39<br />
40<br />
41<br />
43<br />
5<br />
3<br />
2<br />
4<br />
6<br />
D<br />
R<br />
7<br />
14<br />
10<br />
9<br />
11<br />
12<br />
VCC<br />
SP491<br />
120R<br />
TXDM_C<br />
TXDP_C<br />
RXDP_C<br />
RXDM_C<br />
GND<br />
DSR#<br />
DCD#<br />
RI#<br />
44<br />
45<br />
46<br />
5<br />
3<br />
2<br />
D<br />
R<br />
10<br />
9<br />
11<br />
12<br />
120R<br />
RTSM_C<br />
RTSP_C<br />
CTSP_C<br />
6<br />
7<br />
CTSM_C<br />
Figure 4.2 Dual RS422 Configuration<br />
In this case both channel A and channel C are configured as UART operating at TTL levels. The Sipex<br />
SP491 is used as a level converter to convert the TTL level signals from the <strong>FT4232H</strong> to RS422 levels.<br />
The PWREN# signal is used to power down the level shifters such that they operate in a low quiescent<br />
current when the USB interface is in suspend mode.<br />
Copyright © 2010 <strong>Future</strong> <strong>Technology</strong> <strong>Devices</strong> <strong>International</strong> Limited 18
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