FT4232HL-TRAY International Semiconductor Technologies, FT4232HL-TRAY Datasheet - Page 18

• Manufacturer Part Number: FT4232HL-TRAY
• Description: Specifications: Number of Channels: 4, QUART ; Lead Free Status: Lead Free ; RoHS Status: RoHS Compliant
• Manufacturer: International Semiconductor Technologies

Document No.: FT_000060
FT4232H QUAD HIGH SPEED USB TO MULTIPURPOSE UART/MPSSE IC
Datasheet Version 2.2
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.
Figure 4.2 Dual RS422 Configuration
In this case both channel A and channel C are configured as UART operating at TTL levels and a level
converter device (full duplex RS485 transceiver) is used 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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