DS_FT311D USB ANDROID HOST IC Datasheet
Version 1.2
Document No.: FT_000660 Clearance No.: FTDI# 305
8.2 USB to UART Converter
5V
3V3
3V3
REGULATOR
VCC
Ferrite
Bead
VCCIO
1
UART_TXD
RESET#
USBDM
IOBUS0
IOBUS1
IOBUS2
IOBUS3
IOBUS4
IOBUS5
IOBUS6
IOBUS7
27R
27R
2
3
UART_RXD
UART_RTS#
USBDP
4
MCU/FPGA
5
UART_CTS#
47pF
47pF
SHIELD
FT311D
UART_TX_ACTIVE
100nF
CNFG2
CNFG1
CNFG0
GND
GND
GND
1V8 PLL VCC IN
10k
VREGOUT
D
N
3V3
D
N
G
A
3V3
G
100nF
+
4.7uF
100nF
GND
GND
Figure 8.2 Application Example showing USB to UART Converter
This example shows the CNFGx pins set for mode 001 - UART.
The UART signals are at 3V3 level and may be used to drive directly into a FPGA or MCU with a 3V3
interface, or could be level shifted with an RS232, RS422 or RS485 transceiver. The UART_TX_ACTIVE
signal is used mostly with RS485 transceivers to enable the transmit drivers.
The unused pins may be left unterminated.
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