UM232R FTDI, Future Technology Devices International Ltd, UM232R Datasheet - Page 9

• Manufacturer Part Number: UM232R
• Description: MODULE USB-SER UART FT232 24-DIP
• Manufacturer: FTDI, Future Technology Devices International Ltd

Specifications of UM232R

• Main Purpose: Interface, USB 2.0 to UART (RS232) Bridge
• Embedded: No
• Utilized Ic / Part: FT232R
• Primary Attributes: Full Speed, Rates of 300 ~ 3 MBaud, Security ID Number
• Secondary Attributes: 6 ~ 48MHz Clock Generator Output, Royalty-Free Drivers
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 768-1019

4.2 Signal Descriptions
Pin No.
1
2
3
4
5
6
7, 24
8
9
10
11
12
13
14
15, 21
17
16
18
19
20
© Copyright 2009 Future Technology Devices International Ltd
Name
TXD
DTR#
RTS#
VIO
RXD
RI#
GND
DSR#
DCD#
CTS#
CB4
CB2
SLD
USB
VCC
PU1
PU2
CB3
3V3
RST#
Type
Output
Output
Output
PWR
Input
Input
PWR
Input
Input
Input
I/O
I/O
GND
Output
PWR or
Output
Control
Control
I/O
Output
Input
Description
Transmit Asynchronous Data Output.*
Data Terminal Ready Control Output / Handshake Signal.*
Request to Send Control Output / Handshake Signal.*
+1.8V to +5.25V supply to the UART Interface and CBUS I/O pins (1...3, 5, 6, 9...14,
22, 23).
In USB bus powered designs connect to 3V3 to drive out at 3.3V levels (connect jumper
J1 pins 1 and 2 together), or connect to VCC to drive out at 5V CMOS level (connect
jumper J1 pins 2 and 3 together). This pin can also be supplied with an external 1.8V -
2.8V supply in order to drive out at lower levels. It should be noted that in this case
this supply should originate from the same source as the supply to VCC. This means
that in bus powered designs a regulator which is supplied by the 5V on the USB bus
should be used.
Receiving Asynchronous Data Input.*
Ring Indicator Control Input. When remote wake up is enabled in the internal EEPROM
taking RI# low >20ms can be used to resume the PC USB host controller from
suspend.*
Module Ground Supply Pins
Data Set Ready Control Input / Handshake Signal.*
Data Carrier Detect Control Input.
Clear To Send Control Input / Handshake Signal.*
Configurable CBUS I/O Pin. Function of this pin is configured in the device internal
EEPROM. Factory Default pin function is SLEEP#. See CBUS Signal Options, Table 4.4.*
Configurable CBUS I/O Pin. Function of this pin is configured in the device internal
EEPROM. Factory Default pin function is TXDEN. See CBUS Signal Options,Table 4.4.*
USB Cable Shield.
5V Power output USB port. For a low power USB bus powered design, up to 100mA can
be sourced from the 5V supply on the USB bus. A maximum of 500mA can be sourced
from the USB bus in a high power USB bus powered design.
These two pins are internally connected on the module PCB. To power the module from
the 5V supply on USB bus connects jumper J2 pins 1 and 2 together (this is the module
default configuration). In this case these pins would have the same description as pin
14.
To use the UM232R module in a self powered configuration ensure that jumper J2 pins
1 and 2 are not connected together, and apply an external 3.5V to 5.25V supply to one
of these pins.
Pull up resistor pin connection 2. Connect to pin 20 (RST#) in a self powered
configuration.
Pull up resistor pin connection 1. Connect to pin 14 (USB) in a self powered
configuration.
Configurable CBUS I/O Pin. Function of this pin is configured in the device internal
EEPROM. Factory Default pin Function is PWREN#. See CBUS Signal Options, Table
4.4.*
3.3V output from integrated L.D.O. regulator. This pin is decoupled to ground on the
module pcb with a 10nF capacitor. The prime purpose of this pin 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 FT232RL‟s VCCIO pin by connecting this pin to
pin 4 (VIO), or by connecting together pins 1 and 2 on jumper J1.
Can be used by an external device to reset the FT232R. If not required can be left
UM232R USB - Serial UART Development Module Incorporating Clock Generator
Document Reference No.: FT_000051
Clearance No.: FTDI# 125
Datasheet Version 1.04
8