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FT4232H 데이터시트(PDF) 18 Page - Future Technology Devices International Ltd.

부품명 FT4232H
상세설명  QUAD HIGH SPEED USB TO MULTIPURPOSE UART
PDF  43 Pages
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제조업체  FTDI [Future Technology Devices International Ltd.]
홈페이지  http://www.ftdichip.com
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FT4232H 데이터시트(HTML) 18 Page - Future Technology Devices International Ltd.

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Copyright © 2009 Future Technology Devices International Limited
18
Document No.: FT_000060
FT4232H QUAD HIGH SPEED USB TO MULTIPURPOSE UART/MPSSE IC
Datasheet Version 2.05
Clearance No.: FTDI#78
4.3.2
RS422 Configuration
Figure 4.2 illustrates how the FT4232H can be configured as a dual RS422 interface. The FT4232H can
have all 4 channels connected as RS422, but only channel A and channel C are shown for clarity.
FT4232H
TXDM_A
RXDP_A
RTSP_A
CTSP_A
GND
VCC
5
4
12
9
3
11
2
10
14
7
6
D
R
SP491
5
4
12
9
3
11
2
10
14
7
6
D
R
SP491
VCC
120R
120R
TXDP_A
RXDM_A
RTSM_A
CTSM_A
TXDM_C
RXDP_C
RTSP_C
CTSP_C
GND
VCC
5
4
12
9
3
11
2
10
14
7
6
D
R
SP491
5
4
12
9
3
11
2
10
14
7
6
D
R
SP491
VCC
120R
120R
TXDP_C
RXDM_C
RTSM_C
CTSM_C
DB9-M
RS422 Channel C
DB9-M
RS422 Channel A
SUSPEND#
TXD
RXD
RTS#
CTS#
DTR#
DSR#
DCD#
RI#
PWREN#
TXD
RXD
RTS#
CTS#
DTR#
DSR#
DCD#
RI#
36
16
17
18
19
21
22
23
24
60
38
39
40
41
43
44
45
46
Figure 4.2 Dual RS422 Configuration
In this case both channel A and channel C are configured as UART operating at TTL levels. The Sipex
SP491 is used as a level converter to convert the TTL level signals from the FT4232H to RS422 levels.
The PWREN# signal is used to power down the level shifters such that they operate in a low quiescent
current when the USB interface is in suspend mode.



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