UM232R芯片引脚定义引脚图及功能IC贸易商引脚图技术参数-中国IC网-芯三七

™

Future Technology Devices International Ltd.

UM232R USB- Serial UART

Development Module

Incorporating Clock Generator Output

and FTDIChip-ID™ Security Dongle

The UM232R is a development module which uses FTDI’s FT232RL, the latest device to be added to FTDI’s range of

USB UART interface Integrated Circuit Devices.

The FT232RL is a USB to serial UART interface with optional clock generator output, and the new FTDIChip-ID™

security dongle feature. In addition, asynchronous and synchronous bit bang interface modes are available. USB to

serial interface designs using the FT232RL have been further simpliﬁed by fully integrating the external EEPROM,

clock circuit and USB resistors onto the device.

The FT232RL adds two new functions compared with its predecessors, effectively making it a “3-in-1” chip for some

application areas. The internally generated clock (6MHz, 12MHz, 24MHz, and 48MHz) can be brought out of the

device and used to drive a microcontroller or external logic. A unique number (the FTDIChip-ID™) is burnt into the

device during manufacture and is readable over USB, thus forming the basis of a security dongle which can be used

to protect customer application software from being copied.

The UM232R is supplied on a PCB which is designed to plug into a standard 15.0mm (0.6” ) wide 24 pin DIP socket.

All components used, including the FT232RL are Pb-free (RoHS compliant).

Page 2

1. Features

1.1 Hardware Features

•

Single chip USB to asynchronous serial data

transfer interface.

•

Support for USB suspend and resume.

Support for bus powered, self powered, and high-

power bus powered USB conﬁgurations.

On board jumper allows for selection of USB bus

powered supply or self powered supply.

Integrated 3.3V level converter for USB I/O.

Integrated level converter on UART and CBUS for

interfacing to 5V - 1.8V Logic.

On board jumper allows for selection of UART and

CBUS interface IO voltage.

True 5V / 3.3V / 2.8V / 1.8V CMOS drive output

and TTL input.

High I/O pin output drive option.

Integrated USB resistors.

Integrated power-on-reset circuit.

Fully integrated clock - no external crystal,

oscillator, or resonator required.

Entire USB protocol handled on the chip - No

USB-speciﬁc ﬁrmware programming required.

UART interface support for 7 or 8 data bits, 1 or 2

stop bits and odd / even / mark / space / no parity.

Fully assisted hardware or X-On / X-Off software

handshaking.

Data transfer rates from 300 baud to 3 Megabaud

(RS422 / RS485 and at TTL levels) and 300 baud

to 1 Megabaud (RS232).

FTDI’s royalty-free VCP and D2XX drivers

eliminate the requirement for USB driver

development in most cases.

In-built support for event characters and line break

condition.

•

New USB FTDIChip-ID™ feature.

New conﬁgurable CBUS I/O pins.

•

Fully integrated AVCC supply ﬁltering - No separate

AVCC pin and no external R-C ﬁlter required.

UART signal inversion option.

Auto transmit buffer control for RS485 applications.

Transmit and receive LED drive signals.

New 48MHz, 24MHz,12MHz, and 6MHz clock

output signal Options for driving external MCU or

FPGA.

FIFO receive and transmit buffers for high data

throughput.

Adjustable receive buffer timeout.

Synchronous and asynchronous bit bang mode

interface options with RD# and WR# strobes.

New CBUS bit bang mode option.

Integrated 1024 bit internal EEPROM for storing

USB VID, PID, serial number and product

description strings, and CBUS I/O conﬁguration.

Device supplied preprogrammed with unique USB

serial number.

•

USB bulk transfer mode.

3.3V to 5.25V Single Supply Operation.

Low operating and USB suspend current.

Low USB bandwidth consumption.

UHCI / OHCI / EHCI host controller compatible

USB 2.0 Full Speed compatible.

-40°C to 85°C extended operating temperature

range.

Supplied in PCB designed to ﬁt a standard 15.0mm

(0.6”) wide 24 pin DIP socket. Pins are on a

2.60mm (0.1”) pitch.

•

On board USB ‘B’ socket allows module to be

connected to a PC via a standard A to B USB

cable.

•

1.2 Driver Support

Royalty-Free VIRTUAL COM PORT

(VCP) DRIVERS for...

Royalty-Free D2XX Direct Drivers

(USB Drivers + DLL S/W Interface)

•

Windows 98, 98SE, ME, 2000, Server 2003, XP.

Windows Vista / Longhorn*

Windows XP 64-bit.*

Windows XP Embedded.

Windows CE.NET 4.2 & 5.0

MAC OS 8 / 9, OS-X

•

Windows 98, 98SE, ME, 2000, Server 2003, XP.

Windows Vista / Longhorn*

Windows XP 64-bit.*

Windows XP Embedded.

Windows CE.NET 4.2 & 5.0

Linux 2.4 and greater

The drivers listed above are all available to download for free from the FTDI website. Various 3rd Party Drivers are

also available for various other operating systems - see the FTDI website for details.

* Currently Under Development. Contact FTDI for availability.

1.3 Typical Applications

•

USB to RS232 / RS422 / RS485 Converters

Upgrading Legacy Peripherals to USB

Cellular and Cordless Phone USB data transfer

cables and interfaces

Interfacing MCU / PLD / FPGA based designs to

USB

USB Audio and Low Bandwidth Video data transfer

PDA to USB data transfer

USB Smart Card Readers

•

USB Industrial Control

USB MP3 Player Interface

USB FLASH Card Reader / Writers

Set Top Box PC - USB interface

USB Digital Camera Interface

USB Hardware Modems

USB Wireless Modems

USB Bar Code Readers

USB Software / Hardware Encryption Dongles

•

USB Instrumentation

UM232R USB-Serial UART Development Module Datasheet Version 1.02

Page 3

2. FT232RL Features and Enhancements

2.1 Key Features

This section summarises the key features and enhancements of the FT232RL IC device which is used on the

UM232R Module. For further details, consult the FT232R datasheet, which is available from the FTDI website.

Integrated Clock Circuit - Previous generations of FTDI’s USB UART devices required an external crystal or ceramic

resonator. The clock circuit has now been integrated onto the device meaning that no crystal or ceramic resonator is

required. However, if required, an external 12MHz crystal can be used as the clock source.

Integrated EEPROM - Previous generations of FTDI’s USB UART devices required an external EEPROM if the

device were to use USB Vendor ID (VID), Product ID (PID), serial number and product description strings other than

the default values in the device itself. This external EEPROM has now been integrated onto the FT232R chip meaning

that all designs have the option to change the product description strings. A user area of the internal EEPROM is

available for storing additional data. The internal EEPROM is programmable in circuit, over USB without any additional

voltage requirement.

Preprogrammed EEPROM - The FT232R is supplied with its internal EEPROM preprogrammed with a serial number

which is unique to each individual device. This, in most cases, will remove the need to program the device EEPROM.

Integrated USB Resistors - Previous generations of FTDI’s USB UART devices required two external series resistors

on the USBDP and USBDM lines, and a 1.5 kΩ pull up resistor on USBDP. These three resistors have now been

integrated onto the device.

Integrated AVCC Filtering - Previous generations of FTDI’s USB UART devices had a separate AVCC pin - the

supply to the internal PLL. This pin required an external R-C ﬁlter. The separate AVCC pin is now connected internally

to VCC, and the ﬁlter has now been integrated onto the chip.

Less External Components - Integration of the crystal, EEPROM, USB resistors, and AVCC ﬁlter will substantially

reduce the bill of materials cost for USB interface designs using the FT232R compared to its FT232BM predecessor.

Conﬁgurable CBUS I/O Pin Options - There are now 5 conﬁgurable Control Bus (CBUS) lines. Options are TXDEN

- transmit enable for RS485 designs, PWREN# - Power control for high power, bus powered designs, TXLED# - for

pulsing an LED upon transmission of data, RXLED# - for pulsing an LED upon receiving data, TX&RXLED# - which

will pulse an LED upon transmission OR reception of data, SLEEP# - indicates that the device going into USB

suspend mode, CLK48 / CLK24 / CLK12 / CLK6 - 48MHz, 24MHz,12MHz, and 6MHz clock output signal options.

There is also the option to bring out bit bang mode read and write strobes (see below). The CBUS lines can be

conﬁgured with any one of these output options by setting bits in the internal EEPROM. The device is supplied with

the most commonly used pin deﬁnitions preprogrammed - see Section 8 for details.

Enhanced Asynchronous Bit Bang Mode with RD# and WR# Strobes - The FT232R supports FTDI’s BM chip

bit bang mode. In bit bang mode, the eight UART lines can be switched from the regular interface mode to an 8-bit

general purpose I/O port. Data packets can be sent to the device and they will be sequentially sent to the interface

at a rate controlled by an internal timer (equivalent to the baud rate prescaler). With the FT232R device this mode

has been enhanced so that the internal RD# and WR# strobes are now brought out of the device which can be used

to allow external logic to be clocked by accesses to the bit bang I/O bus. This option will be described more fully in a

separate application note.

Synchronous Bit Bang Mode - Synchronous bit bang mode differs from asynchronous bit bang mode in that the

interface pins are only read when the device is written to. Thus making it easier for the controlling program to measure

the response to an output stimulus as the data returned is synchronous to the output data. The feature was previously

seen in FTDI’s FT2232C device. This option will be described more fully in a separate application note.

CBUS Bit Bang Mode - This mode allows four of the CBUS pins to be individually conﬁgured as GPIO pins, similar

to Asynchronous bit bang mode. It is possible to use this mode while the UART interface is being used, thus providing

up to four general purpose I/O pins which are available during normal operation. An application note describing this

feature is available separately from the FTDI website.

UM232R USB-Serial UART Development Module Datasheet Version 1.02

Page 4

Lower Supply Voltage - Previous generations of the chip required 5V supply on the VCC pin. The FT232R will work

with a Vcc supply in the range 3.3V - 5.25V. Bus powered designs would still take their supply from the 5V on the USB

bus, but for self powered designs where only 3.3V is available and there is no 5V supply there is no longer any need

for an additional external regulator.

Integrated Level Converter on UART Interface and Control Signals - VCCIO pin supply can be from 1.8V to 5V.

Connecting the VCCIO pin to 1.8V, 2.8V, or 3.3V allows the device to directly interface to 1.8V, 2.8V or 3.3V and other

logic families without the need for external level converter I.C. devices.

5V / 3.3V / 2.8V / 1.8V Logic Interface - The FT232R provides true CMOS Drive Outputs and TTL level Inputs.

Integrated Power-On-Reset (POR) Circuit- The device incorporates an internal POR function. A RESET# pin is

available in order to allow external logic to reset the FT232R where required. However, for many applications the

RESET# pin can be left unconnected, or pulled up to VCCIO.

Lower Operating and Suspend Current - The device operating supply current has been further reduced to 15mA,

and the suspend current has been reduced to around 70μA. This allows greater margin for peripheral designs to meet

the USB suspend current limit of 500μA.

Low USB Bandwidth Consumption - The operation of the USB interface to the FT232R has been designed to use

as little as possible of the total USB bandwidth available from the USB host controller.

High Output Drive Option - The UART interface and CBUS I/O pins can be made to drive out at three times the

standard signal drive level thus allowing multiple devices to be driven, or devices that require a greater signal drive

strength to be interfaced to the FT232R. This option is enabled in the internal EEPROM.

Power Management Control for USB Bus Powered, High Current Designs- The PWREN# signal can be used to

directly drive a transistor or P-Channel MOSFET in applications where power switching of external circuitry is required.

An option in the internal EEPROM makes the device gently pull down on its UART interface lines when the power

is shut off (PWREN# is high). In this mode any residual voltage on external circuitry is bled to GND when power is

removed, thus ensuring that external circuitry controlled by PWREN# resets reliably when power is restored.

UART Pin Signal Inversion - The sense of each of the eight UART signals can be individually inverted by setting

options in the internal EEPROM. Thus, CTS# (active low) can be changed to CTS (active high), or TXD can be

changed to TXD#.

FTDIChip-ID™ - Each FT232R is assigned a unique number which is burnt into the device at manufacture. This ID

number cannot be reprogrammed by product manufacturers or end-users. This allows the possibility of using FT232R

based dongles for software licensing. Further to this, a renewable license scheme can be implemented based on the

FTDIChip-ID™ number when encrypted with other information. This encrypted number can be stored in the user area

of the FT232R internal EEPROM, and can be decrypted, then compared with the protected FTDIChip-ID™ to verify

that a license is valid. Web based applications can be used to maintain product licensing this way. An application note

describing this feature is available separately from the FTDI website.

Improved EMI Performance - The reduced operating current and improved on-chip VCC decoupling signiﬁcantly

improves the ease of PCB design requirements in order to meet FCC, CE and other EMI related speciﬁcations.

Programmable Receive Buffer Timeout - The receive buffer timeout is used to ﬂush remaining data from the

receive buffer. This time defaults to 16ms, but is programmable over USB in 1ms increments from 1ms to 255ms, thus

allowing the device to be optimised for protocols that require fast response times from short data packets.

Baud Rates - The FT232R supports all standard baud rates and non-standard baud rates from 300 Baud up to 3

Megabaud. Achievable non-standard baud rates are calculated as follows -

Baud Rate = 3000000 / (n + x)

where n can be any integer between 2 and 16,384 ( = 2¹⁴) and x can be a sub-integer of the value 0, 0.125, 0.25,

0.375, 0.5, 0.625, 0.75, or 0.875. When n = 1, x = 0, i.e. baud rate divisors with values between 1 and 2 are not

possible.

This gives achievable baud rates in the range 183.1 baud to 3,000,000 baud. When a non-standard baud rate is

required simply pass the required baud rate value to the driver as normal, and the FTDI driver will calculate the

required divisor, and set the baud rate. See FTDI application note AN232B-05 for more details.

UM232R USB-Serial UART Development Module Datasheet Version 1.02

Page 5

Extended Operating Temperature Range - The FT232R operates over an extended temperature range of -40º to

+85º C thus allowing the device to be used in automotive and industrial applications.

New Package Options - The FT232R is available in two packages - a compact 28 pin SSOP ( FT232RL) and an

ultra-compact 5mm x 5mm pinless QFN-32 package ( FT232RQ). Both packages are lead ( Pb ) free, and use a

‘green’ compound. Both packages are fully compliant with European Union directive 2002/95/EC.

Figure 1 - The UM232R Module.

UM232R USB-Serial UART Development Module Datasheet Version 1.02

Page 6

3. UM232R Pin Out and Signal Descriptions

3.1 UM232R Pin Out

UM232R © FTDI 2005

1

2

3

1

24

TXD

DTR#

RTS#

VIO

RXD

RI#

GND

CB0

CB1

VCC

RST

3V3

Jumper J1

J1

GND

DSR#

DCD#

CTS#

CB4

CB3

PU1

PU2

VCC

USB

SLD

2

1

J2

Jumper J2

12

CB2

13

Figure 2 - Module Pin Out and Jumper locations.

UM232R USB-Serial UART Development Module Datasheet Version 1.02

Page 7

3.2 Signal Descriptions

Table 1 - Module Pin Out Description

Pin No. Name

Type Description

1

2

3

4

TXD

Output Transmit Asynchronous Data Output.*

Output Data Terminal Ready Control Output / Handshake signal.*

Output Request To Send Control Output / Handshake signal.*

DTR#

RTS#

VIO

PWR

+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.

5

6

RXD

RI#

Input

Receive Asynchronous Data Input.*

Ring Indicator Control Input. When remote wake up is enabled in the internal EEPROM taking RI# low can be

used to resume the PC USB host controller from suspend.*

7, 24

8

GND

DSR#

DCD#

CTS#

CB4

PWR

Input

I/O

Module ground supply pins

Data Set Ready Control Input / Handshake signal.*

Data Carrier Detect Control input.*

9

10

11

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.*

12

CB2

I/O

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.*

13

14

SLD

USB

GND

USB Cable shield.

Output 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.

15, 21

VCC

PWR

or

These two pins are internally connected on the module pcb. To power the module from the 5V supply on USB

bus connect jumper J2 pins 1 and 2 together (this is the module default conﬁguration). In this case these pins

Output 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 con-

nected together, and apply an external 3.3V to 5.25V supply to one of these pins.

16

17

19

PU2

PU1

3V3

Control Pull up resistor pin connection 2. Conect to pin 17 (RST#) in a self powered conﬁguration.

Control Pull up resistor pin connection 1. Connect to pin 14 (USB) in a self powered conﬁguration

Output 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.

20

18

22

23

RST#

CB3

CB1

CB0

Input

Can be used by an external device to reset the FT232R. If not required can be left unconnected, or pulled up

to VCCIO.

I/O

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.*

I/O

Conﬁgurable CBUS I/O Pin. Function of this pin is conﬁgured in the device internal EEPROM. Factory Default

pin function is RXLED#. See CBUS Signal Options, Table 4.*

I/O

Conﬁgurable CBUS I/O Pin. Function of this pin is conﬁgured in the device internal EEPROM. Factory Default

pin function is TXLED#. See CBUS Signal Options, Table 4.*

* When used in Input Mode, these pins are pulled to VCCIO via internal 200kΩ resistors. These pins can be

programmed to gently pull low during USB suspend ( PWREN# = “1” ) by setting an option in the internal EEPROM.

UM232R USB-Serial UART Development Module Datasheet Version 1.02

Page 8

3.3 Jumper Conﬁguration Options

Table 2 - Jumper J1 Pin Description

Pin No. Name

Type Description

1

3V3

Output 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.

2

VIO

PWR

+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.

3

VCC

VCC Output. This will be 5V from the USB bus if pins 1 and 2 on jumper J2 are connected. Alternativly, if the

module is in a self powered conﬁguration, the supply to the VCC module pins (15 and 21) will be brought out

to this jumper pin.

Connect this jumper J1 pin 2 in order to supply the device IO pins from the supply to VCCIO.

Table 3 - Jumper J2 Pin Description

Pin No. Name Type Description

1

USB

PWR

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.

2

VCC

PWR

or

Board supply input. Connect to jumper J2 pin 1 in order to supply the board from the USB bus.

This pin is internally connected to the VCC DIP pins. Remove the jumper connector in a self powered design.

Output

3.4 CBUS Signal Options

The following options can be conﬁgured on the CBUS I/O pins. These options are all conﬁgured in the internal

EEPROM using the utility software MPROG, which can be downloaded from the FTDI website. The default

conﬁguration is described in Section 8.

Table 4 - CBUS Signal Options

CBUS Signal Option Available On CBUS Pin...

Description

TXDEN

CBUS0, CBUS1, CBUS2, CBUS3, CBUS4

Enable transmit data for RS485

PWREN#

CBUS0, CBUS1, CBUS2, CBUS3, CBUS4

Goes low after the device is conﬁgured by USB, then high during

USB suspend. Can be used to control power to external logic P-

Channel logic level MOSFET switch. Enable the interface pull-down

option when using the PWREN# pin in this way.

TXLED#

CBUS0, CBUS1, CBUS2, CBUS3, CBUS4

Transmit data LED drive - pulses low when transmitting data via

USB. See FT232R datasheet for more details.

RXLED#

Receive data LED drive - pulses low when receiving data via USB.

See FT232R datasheet for more details.

TX&RXLED#

SLEEP#

LED drive - pulses low when transmitting or receiving data via

USB. See FT232R datasheet for more details.

Goes low during USB suspend mode. Typically used to power down

an external TTL to RS232 level converter I.C. in USB to RS232

converter designs.

CLK48

CBUS0, CBUS1, CBUS2, CBUS3, CBUS4

CBUS0, CBUS1, CBUS2, CBUS3

48MHz Clock output.

24MHz Clock output.

12MHz Clock output.

6MHz Clock output.

CLK24

CLK12

CLK6

CBitBangI/O

CBUS bit bang mode option. Allows up to 4 of the CBUS pins to be

used as general purpose I/O. Conﬁgured individually for CBUS0,

CBUS1, CBUS2 and CBUS3 in the internal EEPROM. A separate

application note will describe in more detail how to use CBUS bit

bang mode.

BitBangWRn

BitBangRDn

CBUS0, CBUS1, CBUS2, CBUS3

Synchronous and asynchronous bit bang mode WR# strobe Output

Synchronous and asynchronous bit bang mode RD# strobe Output

UM232R USB-Serial UART Development Module Datasheet Version 1.02

Page 9

4. Module Dimensions

Figure 3 - UM232R Module Dimensions

18.10mm

(0.72")

2.54mm

(0.10")

12.00mm

15.00mm

D T F

(0.48")

(0.60")

I

7.50mm 5.50mm

(0.30") (0.22")

2.54mm

(0.10")

21.30mm

(0.85")

1.60mm

(0.06")

33.00mm

(1.50")

10.50mm

(0.42")

5.80mm (0.23")

5.0mm (0.2")

12.50mm

(0.50")

Diameter

0.50mm

(0.02")

15.00mm

(0.60")

All dimensions are in millimeters, with inches in parenthesis.

The FT232RL is supplied in a RoHS compliant 28 pin SSOP package. The package is lead ( Pb ) free and uses a

‘green’ compound. The date code format is YYXX where XX = 2 digit week number, YY = 2 digit year number.

The UM232R module uses exclusivly lead free components.

Both the I.C. device and the module are fully compliant with European Union directive 2002/95/EC.

UM232R USB-Serial UART Development Module Datasheet Version 1.02

Page 10

5. FT232RL Device Characteristics and Ratings

5.1 Absolute Maximum Ratings

The absolute maximum ratings for the FT232R devices are as follows. These are in accordance with the Absolute

Maximum Rating System (IEC 60134). Exceeding these may cause permanent damage to the device.

Table 5 - Absolute Maximum Ratings

Parameter

Value

Unit

Storage Temperature

-65°C to 150°C

Degrees C

Floor Life (Out of Bag) At Factory Ambient

( 30°C / 60% Relative Humidity)

168 Hours

(IPC/JEDEC J-STD-033A MSL

Level 3 Compliant)*

Hours

Ambient Temperature (Power Applied)

Vcc Supply Voltage

-40°C to 85°C

-0.5 to +6.00

-0.5 to +3.8

-0.5 to +(Vcc +0.5)

24

Degrees C.

V

D.C. Input Voltage - USBDP and USBDM

D.C. Input Voltage - High Impedance Bidirectionals

D.C. Input Voltage - All other Inputs

D.C. Output Current - Outputs

V

mA

mW

DC Output Current - Low Impedance Bidirectionals

Power Dissipation (Vcc = 5.25V)

24

500

* If devices are stored out of the packaging beyond this time limit the devices should be baked before use. The

devices should be ramped up to a temperature of 125°C and baked for up to 17 hours.

5.2 DC Characteristics

DC Characteristics ( Ambient Temperature = -40 to 85^oC )

Table 6 - Operating Voltage and Current

Parameter Description

Min

Typ

Max

Units

Conditions

Vcc1

Vcc2

Icc1

Icc2

VCC Operating Supply Voltage

3.3

-

5.25

V

VCCIO Operating Supply Voltage

Operating Supply Current

1.8

-

5.25

-

V

15

70

mA

Normal Operation

USB Suspend*

Operating Supply Current

50

100

μA

Table 7 - UART and CBUS I/O Pin Characteristics (VCCIO = 5.0V, Standard Drive Level)

Parameter Description

Min

Typ

Max

Units

Conditions

Voh

Output Voltage High

3.2

4.1

4.9

V

I source = 2mA

Vol

Output Voltage Low

0.3

1.3

50

0.4

1.6

55

0.6

1.9

60

V

I sink = 2mA

Vin

Input Switching Threshold

Input Switching Hysteresis

**

VHys

mV

Table 8 - UART and CBUS I/O Pin Characteristics (VCCIO = 3.3V, Standard Drive Level)

Parameter Description

Min

Typ

Max

Units

Conditions

Voh

Output Voltage High

2.2

2.7

3.2

V

I source = 1mA

Vol

Output Voltage Low

0.3

1.0

20

0.4

1.2

25

0.5

1.5

30

V

I sink = 2mA

Vin

Input Switching Threshold

Input Switching Hysteresis

**

VHys

mV

UM232R USB-Serial UART Development Module Datasheet Version 1.02

Page 11

Table 9 - UART and CBUS I/O Pin Characteristics (VCCIO = 2.8V, Standard Drive Level)

Parameter Description

Min

Typ

Max

Units

Conditions

Voh

Output Voltage High

2.1

2.6

3.1

V

I source = 1mA

Vol

Output Voltage Low

0.3

1.0

20

0.4

1.2

25

0.5

1.5

30

V

I sink = 2mA

Vin

Input Switching Threshold

Input Switching Hysteresis

**

VHys

mV

Table 10 - UART and CBUS I/O Pin Characteristics (VCCIO = 5.0V, High Drive Level)

Parameter Description

Min

Typ

Max

Units

Conditions

Voh

Output Voltage High

3.2

4.1

4.9

V

I source = 6mA

Vol

Output Voltage Low

0.3

1.3

50

0.4

1.6

55

0.6

1.9

60

V

I sink = 6mA

Vin

Input Switching Threshold

Input Switching Hysteresis

**

VHys

mV

Table 11 - UART and CBUS I/O Pin Characteristics (VCCIO = 3.3V, High Drive Level)

Parameter Description

Min

Typ

Max

Units

Conditions

Voh

Output Voltage High

2.2

2.8

3.2

V

I source = 3mA

Vol

Output Voltage Low

0.3

1.0

20

0.4

1.2

25

0.6

1.5

30

V

I sink = 8mA

Vin

Input Switching Threshold

Input Switching Hysteresis

**

VHys

mV

Table 12 - UART and CBUS I/O Pin Characteristics (VCCIO = 2.8V, High Drive Level)

Parameter Description

Min

Typ

Max

Units

Conditions

Voh

Output Voltage High

2.1

2.8

3.2

V

I source = 3mA

Vol

Output Voltage Low

0.3

1.0

20

0.4

1.2

25

0.6

1.5

30

V

I sink = 8mA

Vin

Input Switching Threshold

Input Switching Hysteresis

**

VHys

mV

**Inputs have an internal 200kΩ pull-up resistor to VCCIO.

Table 13 - RESET# and TEST Pin Characteristics

Parameter Description

Min

Typ

Max

Units

Conditions

Vin

Input Switching Threshold

1.3

1.6

1.9

V

VHys

Input Switching Hysteresis

50

55

60

mV

Table 14 - USB I/O Pin (USBDP, USBDM) Characteristics

Parameter Description

Min

Typ

Max

Units Conditions

UVoh

I/O Pins Static Output ( High)

2.8

3.6

V

RI = 1.5kΩ to 3V3Out ( D+ )

RI = 15kΩ to GND ( D- )

UVol

I/O Pins Static Output ( Low )

0

0.3

V

RI = 1.5kΩ to 3V3Out ( D+ )

RI = 15kΩ to GND ( D- )

UVse

Single Ended Rx Threshold

Differential Common Mode

Differential Input Sensitivity

Driver Output Impedance

0.8

0.2

26

2.0

2.5

V

UCom

UVDif

UDrvZ

V

29

44

Ohms

***

***Driver Output Impedance includes the internal USB series resistors on USBDP and USBDM pins.

UM232R USB-Serial UART Development Module Datasheet Version 1.02

Page 12

5.3 EEPROM Reliability Characteristics

The internal 1024 bit EEPROM has the following reliability characteristics-

Table 15 - EEPROM Characteristics

Parameter Description

Value

Unit

Data Retention

15

Years

Read / Write Cycles

100,000 Cycles

5.4 Internal Clock Characteristics

The internal Clock Oscillator has the following characteristics.

Table 16 - Internal Clock Characteristics

Parameter

Value

Unit

Min

Typical

Max

Frequency of Operation

Clock Period

11.98

12.00

12.02

MHz

ns

83.19

45

83.33

50

83.47

55

Duty Cycle

%

UM232R USB-Serial UART Development Module Datasheet Version 1.02

Page 13

6. Module Conﬁgurations

6.1 Bus Powered Conﬁguration

1

24

J1

J2

12

13

Figure 4 - Bus Powered Conﬁguration

Figure 4 illustrates the UM232R module in a typical USB bus powered design conﬁguration. This can easily be done

by ﬁtting the jumper link on J2, as shown above. The UM232R is supplied in this conﬁguration by default.

A USB Bus Powered device gets its power from the USB bus. Basic rules for USB Bus power devices are as follows –

i) On plug-in to USB, the device must draw no more than 100mA.

ii) On USB Suspend the device must draw no more than 500μA.

iii) A Bus Powered High Power USB Device (one that draws more than 100mA) should use one of the CBUS pins

conﬁgured as PWREN# and use it to keep the current below 100mA on plug-in and 500μA on USB suspend.

iv) A device that consumes more than 100mA can not be plugged into a USB Bus Powered Hub.

v) No device can draw more that 500mA from the USB Bus.

Interfacing the UM232R module to a microcontroller (MCU), or other logic for a bus powered design would be done in

exactly the same way as for a self powered design (see Section 6.2), except that the MCU or external logic would take

its power supply from the USB bus (either the 5V on the USB pin, or 3.3V on the 3V3 pin).

UM232R USB-Serial UART Development Module Datasheet Version 1.02

Page 14

6.2 Self Powered Conﬁguration

Vcc = 3.3V – 5V

TXD 1

RTS# 3

RXD 5

GND 7

24 GND

21 VCC

J1

TXD

RXD

RTS#

20 RST#

CTS#

MCU

17 PU1

16 PU2

CTS# 10

12

15 VCC

14 USB

J2

13

Figure 5 - Self Powered Conﬁguration

Figure 5 illustrates the UM232R in a typical USB self powered conﬁguration. In this case the link on jumper J2 is

removed, and an external supply is connected to the module VCC pins. Figure 5 illustrates a self powered design

which has a 3.3V - 5V supply.

A USB Self Powered device gets its power from its own power supply and does not draw current from the USB bus.

The basic rules for USB Self powered devices are as follows –

i) A Self Powered device should not force current down the USB bus when the USB Host or Hub Controller is

powered down.

ii) A Self Powered Device can use as much current as it likes during normal operation and USB suspend as it has its

own power supply.

iii) A Self Powered Device can be used with any USB Host and both Bus and Self Powered USB Hubs. In this case

the power descriptor in the internal EEPROM should be programmed to a value of zero (self powered).

In order to meet requirement (i) the USB Bus Power is used to control the RESET# Pin of the FT232R device. When

the USB Host or Hub is powered up the internal 1.5kΩ resistor on USBDP is pulled up to 3.3V, thus identifying the

device as a full speed device to USB. When the USB Host or Hub power is off, RESET# will go low and the device

will be held in reset. As RESET# is low, the internal 1.5kΩ resistor will not be pulled up to 3.3V, so no current will be

forced down USBDP via the 1.5kΩ pull-up resistor when the host or hub is powered down. To do this pin 14 (USB) is

connected to PU2 and PU1 is connected to RST#. Failure to do this may cause some USB host or hub controllers to

power up erratically.

Note : When the FT232R is in reset, the UART interface pins all go tri-state. These pins have internal 200kΩ pull-up

resistors to VCCIO, so they will gently pull high unless driven by some external logic.

Figure 5 is also an example of interfacing the FT232R to a Microcontroller (MCU) UART interface. This example uses

TXD and RXD for transmission and reception of data, and RTS# / CTS# hardware handshaking.

Optionally, RI# can be connected to another I/O pin on the MCU and could be used to wake up the USB host

controller from suspend mode. One of the CBUS pins could be conﬁgured as a 6/12/24/48 MHz clock output which

can be used to clock the MCU. If the MCU is handling power management functions, then a CBUS pin can be

conﬁgured as PWREN# and should also be connected to an I/O pin of the MCU.

UM232R USB-Serial UART Development Module Datasheet Version 1.02

Page 15

6.3 USB Bus Powered with Power Switching Conﬁguration

Switched 5V Power

to External Logic

P-Channel Power

MOSFET

s

d

0.1 uF 0.1 uF

g

TXD 1

24

J1

Soft

1k Start

Circuit

TXD

RTS# 3

RXD

RTS#

RXD 5

CTS#

MCU

GND 7

18 CB3

(PWREN#)

CTS# 10

12

J2

14 USB

13

Figure 6 - Bus Powered with Power Switching Conﬁguration

USB Bus powered circuits need to be able to power down in USB suspend mode in order to meet the <= 500μA

total USB suspend current requirement (including external logic). Some external logic can power itself down into a

low current state by monitoring the PWREN# signal. For external logic that cannot power itself down in this way, the

FT232R provides a simple but effective way of turning off power to external circuitry during USB suspend.

Figure 6 shows how to use a discrete P-Channel Logic Level MOSFET to control the power to external logic circuits.

A suitable device would be an International Rectiﬁer (www.irf.com) IRLML6402, or equivalent. It is recommended that

a “soft start” circuit consisting of a 1kΩ series resistor and a 0.1μF capacitor are used to limit the current surge when

the MOSFET turns on. Without the soft start circuit there is a danger that the transient power surge of the MOSFET

turning on will reset the FT232R, or the USB host / hub controller. The values used here allow attached circuitry to

power up with a slew rate of ~12.5V per millisecond, in other words the output voltage will transition from GND to 5V in

approximately 400 microseconds.

Alternatively, a dedicated power switch I.C. with inbuilt “soft-start” can be used instead of a MOSFET. A suitable power

switch I.C. for such an application would be a Micrel (www.micrel.com) MIC2025-2BM or equivalent.

Please note the following points in connection with power controlled designs –

i) The logic to be controlled must have its own reset circuitry so that it will automatically reset itself when power is re-

applied on coming out of suspend.

ii) Set the Pull-down on Suspend option in the internal EEPROM.

iii) One of the CBUS Pins should be conﬁgured as PWE# in the internal EEPROM, and should be used to switch the

power supply to the external circuitry.

iv) For USB high-power bus powered device (one that consumes greater than 100mA, and up to 500mA of current

from the USB bus), the power consumption of the device should be set in the max power ﬁeld in the internal

EEPROM. A high-power bus powered device must use this descriptor in the internal EEPROM to inform the

system of its power requirements.

v) For 3.3V power controlled circuits the FT232R’s VCCIO pin must not be powered down with the external circuitry

(the PWREN# signal gets its VCC supply from VCCIO). Either connect the power switch between the output of the

3.3V regulator and the external 3.3V logic or power VCCIO from the 3V3OUT pin of the FT232R.

UM232R USB-Serial UART Development Module Datasheet Version 1.02

Page 16

6.4 USB Bus Powered with 3.3V Logic Drive / IO Supply Voltage

1

2

3

1

24

J1

J2

12

13

Figure 7 - USB Bus Powered 3.3V Logic Drive

Figure 7 shows a conﬁguration where a jumper switch is used to allow the FT232R to be interfaced with a 3.3V or 5V

logic devices. The FT232R’s VCCIO pin is either supplied with 5V from the USB bus (connect together pins 2 and 3

on J1), or with 3.3V from the FT232R’s 3V3OUT pin (connect together pins 1 and 2 on J1 as shown). The supply to

UM232R’s 3V3 pin can also be used to supply up to 50mA to external logic.

Please note the following in relation to bus powered designs of this type -

i) PWREN# or SLEEP# signals should be used to power down external logic during USB suspend mode, in order to

comply with the limit of 500μA. If this is not possible, use the conﬁguration shown in Section 6.3.

ii) The maximum current source from USB Bus during normal operation should not exceed 100mA, otherwise a bus

powered design with power switching (Section 6.3) should be used.

Another possible conﬁguration would be to use a discrete low dropout regulator which is supplied by the 5V on the

USB bus to supply 2.8V - 1.8V to the VIO pin and to the external logic. VCC would be supplied with the 5V from the

USB bus (available from the module’s USB pin). With VIO connected to the output of the low dropout regulator, would

in turn will cause the FT232R I/O pins to drive out at 2.8V - 1.8V logic levels.

For USB bus powered circuits some considerations have to be taken into account when selecting the regulator –

iii) The regulator must be capable of sustaining its output voltage with an input voltage of 4.35V. A Low Drop Out

(L.D.O.) regulator must be selected.

iv) The quiescent current of the regulator must be low in order to meet the USB suspend total current requirement of

<= 500μA during USB suspend.

An example of a regulator family that meets these requirements is the MicroChip / Telcom TC55 Series of devices

(www.microchip.com). These devices can supply up to 250mA current and have a quiescent current of under 1μA.

UM232R USB-Serial UART Development Module Datasheet Version 1.02

Page 17

7. UM232R Module Circuit Schematic

Figure 8 - Module Circuit Schematic

UM232R USB-Serial UART Development Module Datasheet Version 1.02

Page 18

8. Internal EEPROM Conﬁguration

Following a power-on reset or a USB reset the FT232R will scan its internal EEPROM and read the USB conﬁguration

descriptors stored there. The default values programmed into the internal EEPROM in the FT232RL used on the

UM232R are shown in Table 17.

Table 17 - Default Internal EEPROM Conﬁguration

Parameter

Value

Notes

USB Vendor ID (VID)

0403h

FTDI default VID (hex)

USB Product ID (PID)

Serial Number Enabled?

Serial Number

6001h

Yes

FTDI default PID (hex)

See Note

A unique serial number is generated and programmed into the EEPROM

during ﬁnal test of the UM232R module.

Pull Down I/O Pins in USB Suspend

Disabled

Enabling this option will make the device pull down on the UART interface

lines when the power is shut off (PWREN# is high)

Manufacturer Name

Manufacturer ID

FTDI

FT

Serial Number preﬁx.

Product Description

UM232R USB <->

Serial

Max Bus Power Current

Power Source

100mA

Bus Powered

FT232R

Device Type

USB Version

0200

Returns USB 2.0 device descriptor to the host. Note: The device is be

a USB 2.0 Full Speed device (12Mb/s) as opposed to a USB 2.0 High

Speed device (480Mb/s).

Remote Wake up

High Current I/Os

Load VCP Driver

CBUS0

Enabled

Disabled

Enabled

TXLED#

RXLED#

PWREN#

Taking RI# low will wake up the USB host controller from suspend.

Enables the high drive level on the UART and CBUS I/O pins

Makes the device load the VCP driver interface for the device.

Default conﬁguration of CBUS0 - Transmit LED drive

CBUS1

Default conﬁguration of CBUS1 - Receive LED drive

CBUS2

Default conﬁguration of CBUS2 - Power enable. Low after USB

enumeration, high during USB suspend.

CBUS3

PWREN#

Default conﬁguration of CBUS3 - Power enable. Low after USB

enumeration, high during USB suspend.

CBUS4

SLEEP#

Disabled

Default conﬁguration of CBUS4 - Low during USB suspend.

Signal on this pin becomes TXD# if enabled.

Signal on this pin becomes RXD# if enabled.

Signal on this pin becomes RTS if enabled.

Signal on this pin becomes CTS if enabled.

Signal on this pin becomes DTR if enabled.

Signal on this pin becomes DSR if enabled.

Signal on this pin becomes DCD if enabled.

Signal on this pin becomes RI if enabled.

Invert TXD

Invert RXD

Invert RTS#

Invert CTS#

Invert DTR#

Invert DSR#

Invert DCD#

Invert RI#

The internal EEPROM in the FT232R can be programmed over USB using the utility program MPROG. MPROG can

be downloaded from the FTDI website. Version 2.8a or later is required for the FT232R chip. Users who do not have

their own USB Vendor ID but who would like to use a unique Product ID in their design can apply to FTDI for a free

block of unique PIDs. Contact FTDI support for this service.

UM232R USB-Serial UART Development Module Datasheet Version 1.02

Page 19

Disclaimer

Version 0.9 - Initial Datasheet Created August 2005

Version 1.00 - Full datasheet release December 2005

Version 1.01 - Circuit schematic diagram updated January 2006

Version 1.02 - Module PCB length dimensions January 2006

Neither the whole nor any part of the information contained in, or the product described in this manual, may be

adapted or reproduced in any material or electronic form without the prior written consent of the copyright holder.

This product and its documentation are supplied on an as-is basis and no warranty as to their suitability for any

particular purpose is either made or implied.

Future Technology Devices International Ltd. will not accept any claim for damages howsoever arising as a result of

use or failure of this product. Your statutory rights are not affected.

This product or any variant of it is not intended for use in any medical appliance, device or system in which the failure

of the product might reasonably be expected to result in personal injury.

This document provides preliminary information that may be subject to change without notice.

Contact FTDI

Head Ofﬁce -

Future Technology Devices International Ltd.

373 Scotland Street,

Glasgow G5 8QB,

United Kingdom

Tel. : +(44) 141 429 2777

Fax. : +(44) 141 429 2758

E-Mail (Sales) : sales1@ftdichip.com

E-Mail (Support) : support1@ftdichip.com

E-Mail (General Enquiries) : admin1@ftdichip.com

Regional Sales Ofﬁces -

Future Technology Devices International Ltd.

(Taiwan)

(USA)

4F, No 16-1,

5285 NE Elam Young

Parkway, Suite B800

Hillsboro,

OR 97124-6499

USA

Sec. 6 Mincyuan East Road,

Neihu District,

Taipei 114,

Taiwan, R.o.C.

Tel.: +886 2 8791 3570

Fax: +886 2 8791 3576

Tel.: +1 (503) 547-0988

Fax: +1 (503) 547-0987

E-Mail (Sales): tw.sales@ftdichip.com

E-Mail (Sales): us.sales@ftdichip.com

E-Mail (Support): tw.support@ftdichip.com

E-Mail (General Enquiries): tw.admin@ftdichip.com

E-Mail (Support): us.support@ftdichip.com

E-Mail (General Enquiries): us.admin@ftdichip.com

Website URL : http://www.ftdichip.com

UM232R USB-Serial UART Development Module Datasheet Version 1.02

型号:	UM233
生命周期：	Contact Manufacturer
IHS 制造商：	UNIVERSAL MICROELECTRONICS CO LTD
包装说明：	,
Reach Compliance Code：	unknown
风险等级：	5.6
Is Samacsys：	N
Base Number Matches：	1

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