Datasheet

Copyright © 2009 Future Technology Devices International Limited 10
Document No.: FT_000053
FT232R USB UART IC Datasheet Version 2.02
Clearance No.: FTDI# 38
Pin No. Name Type Description
20
16 3V3OUT Output
+3.3V output from integrated LDO regulator. This pin should be decoupled to
ground using a 100nF capacitor. The purpose of this output is to provide the
internal +3.3V supply to the USB transceiver cell and the internal 1.5kΩ pull up
resistor on USBDP. Up to 50mA can be drawn from this pin to power external logic if
required. This pin can also be used to supply the VCCIO pin.
19 VCC PWR
+3.3V to +5.25V supply to the device core. (See Note 1).
24 AGND PWR
Device analogue ground supply for internal clock multiplier.
Table 3.6 Power and Ground Group
Pin No. Name Type Description
5, 12,
13, 23,
25, 29
NC NC No internal connection. Do not connect.
18 RESET# Input
Active low reset. Can be used by an external device to reset the FT232R. If
not required can be left unconnected, or pulled up to VCC.
26 TEST Input
Puts the device into IC test mode. Must be tied to GND for normal
operation, otherwise the device will appear to fail.
27 OSCI Input
Input 12MHz Oscillator Cell. Optional – Can be left unconnected for normal
operation. (See Note 2).
28 OSCO Output
Output from 12MHZ Oscillator Cell. Optional – Can be left unconnected for
normal operation if internal Oscillator is used. (See Note 2).
Table 3.7 Miscellaneous Signal Group
Pin
No.
Name Type Description
30 TXD Output Transmit Asynchronous Data Output.
31 DTR# Output Data Terminal Ready Control Output / Handshake Signal.
32 RTS# Output Request to Send Control Output / Handshake Signal.
2 RXD Input Receiving Asynchronous Data Input.
3 RI# Input
Ring Indicator Control Input. When remote wake up is enabled in the internal
EEPROM taking RI# low (20ms active low pulse) can be used to resume the
PC USB host controller from suspend.
6 DSR# Input Data Set Ready Control Input / Handshake Signal.
7 DCD# Input Data Carrier Detect Control Input.
8 CTS# Input Clear To Send Control Input / Handshake Signal.
9 CBUS4 I/O
Configurable CBUS output only Pin. Function of this pin is configured in the
device internal EEPROM. Factory default configuration is SLEEP#. See CBUS