Data Sheet

Copyright © 2013 Future Technology Devices International Limited 4
FT231X USB TO FULL HANDSHAKE UART IC
Datasheet
Version 1.2
Document No.: FT_000565 Clearance No.: FTDI# 261
2 FT231X Block Diagram
3.3 Volt LDO
Regulator
1.8 Volt LDO
Regulator
USB
Transceiver
with
Integrated
1.5k pullups
and battery
charge
detection
USB DPLL
Internal
12MHz
Oscillator
X4 Clock
Multiplier
Serial Interface
Engine
(SIE)
USB
Protocol Engine
UART FIFO
Controller
UART Controller
with
Programmable
Signal Inversion
Baud Rate
Generator
Reset
Generator
FIFO TX Buffer
(512 bytes)
FIFO RX Buffer
(512 bytes)
Internal MTP
Memory
48MHz
GND
RESET#
To USB Transceiver Cell
3V3OUT
48MHz
3V3OUT
VCC
USBDP
USBDM
1V8 Internal
Core Supply
TXD
RXD
RTS#
CTS#
DTR#
DSR#
DCD#
RI#
CBUS0
CBUS1
CBUS2
CBUS3
Figure 2.1 FT231X Block Diagram
For a description of each function please refer to Section 4.