DS_FT312D USB ANDROID HOST IC Datasheet
Version 1.1
Document No.: FT_000816 Clearance No.: FTDI# 331
8 Application Examples
The following sections illustrate possible applications of the FT312D.
8.1 USB to UARTConverter
5V
3V3
3V3
REGULATOR
5V Power to USB
VCC
Ferrite
Bead
VCCIO
1
UART_TXD
RESET#
TXD
RXD
27R
27R
2
3
USBDM
USBDP
UART_RXD
UART_RTS#
4
MCU/FPGA
RTS#
CTS#
5
UART_CTS#
47pF
47pF
SHIELD
FT312D
UART_TX_ACTIVE
TX_ACTIVE
100nF
GND
GND
LED
AVCC
620R
3V3
USB_ERROR
VREGOUT
D
N
3V3
G
100nF
+
4.7uF
100nF
GND
GND
Figure 8.1Application Example showing USB to UART Converter
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 TX_ACTIVE signal is
used mostly with RS485 transceivers to enable the Transmit line drivers.
The unused pins may be left unterminated.
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