EVAL232R [FTDI]
FT232RL USB to RS232 Evaluation Module; FT232RL USB到RS232评估模块
| 型号： | EVAL232R |
| 厂家： | 
FUTURE TECHNOLOGY DEVICES INTERNATIONAL LTD. |
| 描述： | FT232RL USB to RS232 Evaluation Module |
| 文件： | 总18页 (文件大小：617K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
™
Future Technology Devices International Ltd.
EVAL232R
FT232RL USB to RS232
Evaluation Module
Incorporating Clock Generator Output
and FTDIChip-ID™ Security Dongle
The EVAL232R is a USB to RS232 evaluation module for FTDI’s FT232RL USB - Serial UART interface IC device, 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 EVAL232R is supplied on a 61.0mm x 32.0mm (2.40” x 1.26”) PCB. All components used, including the FT232RL
and RS232 level converter IC are Pb-free (RoHS compliant).
Copyright © Future Technology Devices International Ltd. 2005
Page 2
1. Features
1.1 Hardware Features
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FT232RL provides single chip USB to
asynchronous serial data transfer interface.
Module provides USB to RS232 interface, with
additional I/O pinout.
Entire USB protocol handled on the FT232RL 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 1 Megabaud
at RS232 levels.
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.
Transmit and receive LED’s to indicate serial data
transfer.
New 48MHz, 24MHz,12MHz, and 6MHz clock
output signal Options.
FIFO receive and transmit buffers for high data
throughput.
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Device supplied preprogrammed with unique USB
serial number.
Support for USB suspend and resume.
Module supply voltage comes from VCC - no
external supply required.
5V USB power available to supply external
devices.
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.
Fully integrated AVCC supply filtering - No separate
AVCC pin and no external R-C filter required.
USB bulk transfer mode.
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.
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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.
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Supplied on minature 61.0mm x 32.0mm (2.40” x
1.26”) PCB with 15 board header pins.
Connect to a PC via a standard USB 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)
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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
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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
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
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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
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USB to RS232 Converter
Upgrading Legacy Peripherals to USB
USB Audio and Low Bandwidth Video data transfer
PDA to USB data transfer
USB Smart Card Readers
USB Instrumentation
USB Software / Hardware Encryption Dongles
USB Industrial Control
USB MP3 Player Interface
EVAL232R FT232RL USB to RS232 Evaluation Module Datasheet Version 0.90
© Future Technology Devices International Ltd. 2005
Page 3
2. 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
EVAL232R 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.
EVAL232R FT232RL USB to RS232 Evaluation Module Datasheet Version 0.90
© Future Technology Devices International Ltd. 2005
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.
EVAL232R FT232RL USB to RS232 Evaluation Module Datasheet Version 0.90
© Future Technology Devices International Ltd. 2005
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. The MM232R
module uses a FT232RQ device in its design.
Figure 1 - The EVAL232R Development Module.
EVAL232R FT232RL USB to RS232 Evaluation Module Datasheet Version 0.90
© Future Technology Devices International Ltd. 2005
Page 6
3. EVAL232R Pin Out and Signal Descriptions
3.1 EVAL232R Pin Out
1
2
3
4
5
6
7
8
1
3
2
4
TX
LED
LP1
LP2
RX
LED
J2
J3
1
2
3
J1
Figure 2 - EVAL232R Module Pin Out.
DCD
1
RXD
2
TXD
3
DTR
4
GND
5
DSR
RTS
7
CTS
8
RI
6
9
Figure 3 - EVAL232R RS232 (DB9) Pin Out
EVAL232R FT232RL USB to RS232 Evaluation Module Datasheet Version 0.90
© Future Technology Devices International Ltd. 2005
Page 7
3.2 Header Pin and Jumper Signal Descriptions
Table 1 - Module Pin Out Description - Jumper J1
Pin No. Name
Type Description
1
VCC
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.
2
VCCIO
Input
+1.8V to +5.25V supply to the FT232RL’s UART Interface and CBUS I/O pins. In USB bus powered designs
connect to 3V3 to drive out at 3.3V levels (connect VCCIO to VCC3O), or connect to VCC to drive out at 5V
CMOS level (connect VCCIO to VCC). 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 (like the EVAL232R for example)
a regulator which is supplied by the 5V on the USB bus should be used.
3
VCC3O
Output 3.3V output from FT232RL’s integrated L.D.O. regulator. This pin is decoupled to ground on the module pcb
with a 100nF capacitor. The prime purpose of this pin is to provide the internal 3.3V supply to the USB trans-
ceiver 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 3 (VCCIO).
Table 2 - Module Pin Out Description - 8 Pin Header J2
Pin No. Name
Type Description
1
VCC
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.
2
3
4
5
6
CBUS0
CBUS1
CBUS2
CBUS3
VCC3O
Input
Configurable CBUS I/O Pin. Function of this pin is configured in the device internal EEPROM. Factory default
pin function for the EVAL232R module is RXLED#. See CBUS Signal Options, Table 4.*
Output Configurable CBUS I/O Pin. Function of this pin is configured in the device internal EEPROM. Factory default
pin function for the EVAL232R module is TXLED#. See CBUS Signal Options, Table 4.*
Output Configurable CBUS I/O Pin. Function of this pin is configured in the device internal EEPROM. Factory default
pin function for the EVAL232R module is PWREN#. See CBUS Signal Options, Table 4.*
Output Configurable CBUS I/O Pin. Function of this pin is configured in the device internal EEPROM. Factory default
pin function for the EVAL232R module is PWREN#. See CBUS Signal Options, Table 4.*
Output 3.3V output from FT232RL’s integrated L.D.O. regulator. This pin is decoupled to ground on the module pcb
with a 100nF capacitor. The prime purpose of this pin is to provide the internal 3.3V supply to the USB trans-
ceiver 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.
7
3
RESET#
GND
Input
Can be used by an external device to reset the FT232R. If not required can be left unconnected, or pulled up
to VCCIO.
GND
Module ground supply pins
Table 3 - Module Pin Out Description - Jumper J3
Pin No. Name
Type Description
1
CBUS0
Output Configurable CBUS I/O Pin. Function of this pin is configured in the device internal EEPROM. Factory default
pin function for the EVAL232R module is RXLED#. See CBUS Signal Options, Table 4.*
Connect to LP1 to drive the red receive data LED (module default)
2
3
LP1
Input
Red receive data LED
CBUS1
Output Configurable CBUS I/O Pin. Function of this pin is configured in the device internal EEPROM. Factory default
pin function for the EVAL232R module is TXLED#. See CBUS Signal Options, Table 4.*
Connect to LP2 to drive the green transmit data LED (module default)
3
LP2
Intput
Green transmit data LED
* 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.
EVAL232R FT232RL USB to RS232 Evaluation Module Datasheet Version 0.90
© Future Technology Devices International Ltd. 2005
Page 8
3.3 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
TXLED#
CBUS0, CBUS1, CBUS2, CBUS3, CBUS4
Transmit data LED drive - pulses low when transmitting data via
USB. See FT232R datasheet for more details.
RXLED#
CBUS0, CBUS1, CBUS2, CBUS3, CBUS4
CBUS0, CBUS1, CBUS2, CBUS3, CBUS4
CBUS0, CBUS1, CBUS2, CBUS3, CBUS4
Receive data LED drive - pulses low when receiving data via USB.
See FT232R datasheet for more details.
TX&RXLED#
PWREN#
LED drive - pulses low when transmitting or receiving data via
USB. See FT232R datasheet for more details.
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.
SLEEP#
CBUS0, CBUS1, CBUS2, CBUS3, CBUS4
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, CBUS4
CBUS0, CBUS1, CBUS2, CBUS3, CBUS4
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
CBUS0, CBUS1, CBUS2, CBUS3
Synchronous and asynchronous bit bang mode WR# strobe Output
Synchronous and asynchronous bit bang mode RD# strobe Output
3.4 RS232 Signal Descriptions
Table 5 - RS232 Signals
DB9 pin No. Name
Type Description
1
2
3
4
5
6
7
8
9
DCD
RXDATA
TXDATA
DTR
Input
Data Carrier Detect control input
Input
Receive Asynchronous Data input.
Output
Output
GND
Transmit Asynchronous Data output.
Data Terminal Ready control output / Handshake signal
Device groud supply pin.
GND
DSR
Input
Data Set Ready control input / Handshake signal
Request To Send Control Output / Handshake signal.
Clear to Send Control input / Handshake signal.
RTS
Output
Input
CTS
RI
Input
Ring Indicator control input. When remote wakeup is enabled in the FT232RL’s internal
EEPROM taking RI# low can be used to resume the PC USB host controller from suspend.
EVAL232R FT232RL USB to RS232 Evaluation Module Datasheet Version 0.90
© Future Technology Devices International Ltd. 2005
Page 9
4. Module Dimensions
61.50mm
(2.46")
12.50mm
(0.50")
2.75mm
(0.11")
3.25mm (0.13")
LP1
4.70mm (0.19")
LP2
J2
J3
32.00mm
(1.28")
18.00mm
(0.72")
12.00mm
(0.48")
J1
Ø 2.50mm
(0.10")
3.25mm
(0.13")
7.00mm
(0.28")
5.50mm
(0.22")
1.90mm
(0.08")
2.55mm
(0.10")
11.80mm
(0.47")
0.65mm
(0.03")
9.30mm
(0.37")
14.35mm
(0.57")
12.5mm
(0.50")
1.60mm (0.06")
20.00mm
(0.80")
4.95mm
(0.20")
61.00mm
(2.44")
Figure 4 - EVAL232R Module Dimensions
All dimensions are stated in millimeters, with inches in parenthesis.
The FT232RL is supplied in a RoHS compliant 28 pinSSOP 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 EVAL232R module uses exclusivly lead free components.
Both the I.C. device and the module are fully compliant with European Union directive 2002/95/EC.
EVAL232R FT232RL USB to RS232 Evaluation Module Datasheet Version 0.90
© Future Technology Devices International Ltd. 2005
Page 10
5. 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 6 - 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)
-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
V
V
mA
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 85oC )
Table 7 - 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 8 - FT232R 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
V
I sink = 2mA
Vin
Input Switching Threshold
Input Switching Hysteresis
**
**
VHys
mV
Table 9 - FT232R 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
V
I sink = 2mA
Vin
Input Switching Threshold
Input Switching Hysteresis
**
**
VHys
mV
EVAL232R FT232RL USB to RS232 Evaluation Module Datasheet Version 0.90
© Future Technology Devices International Ltd. 2005
Page 11
Table 10 - FT232R 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
V
I sink = 2mA
Vin
Input Switching Threshold
Input Switching Hysteresis
**
**
VHys
mV
Table 11 - FT232R 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
V
I sink = 6mA
Vin
Input Switching Threshold
Input Switching Hysteresis
**
**
VHys
mV
Table 12 - FT232R 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
V
I sink = 8mA
Vin
Input Switching Threshold
Input Switching Hysteresis
**
**
VHys
mV
Table 13 - FT232R 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
V
I sink = 8mA
Vin
Input Switching Threshold
Input Switching Hysteresis
**
**
VHys
mV
**Inputs have an internal 200kΩ pull-up resistor to VCCIO.
Table 14 - FT232R 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 15 - FT232R 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
0.8
0.2
26
2.0
2.5
V
V
UCom
UVDif
UDrvZ
V
29
44
Ohms
***
***Driver Output Impedance includes the internal USB series resistors on USBDP and USBDM pins.
EVAL232R FT232RL USB to RS232 Evaluation Module Datasheet Version 0.90
© Future Technology Devices International Ltd. 2005
Page 12
5.3 EEPROM Reliability Characteristics
The FT232R’s internal 1024 bit EEPROM has the following reliability characteristics-
Table 16 - EEPROM Characteristics
Parameter Description
Value
Unit
Data Retention
15
Years
Read / Write Cycles
100,000 Cycles
5.4 Internal Clock Characteristics
The FT232R’s internal Clock Oscillator has the following characteristics.
Table 17 - 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
%
EVAL232R FT232RL USB to RS232 Evaluation Module Datasheet Version 0.90
© Future Technology Devices International Ltd. 2005
Page 13
6. Module Configurations
6.1 Bus Powered Configuration
The EVAL232R module is designed to be powered from the 5V supply available on the USB bus powered. VCCIO, the
supply to the FT232RL’s UART and CBUS IO pins, can be connected to VCC or VCC3O, depending on wheather 5V
or 3.3V output levels are required on the CBUS.
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 PWREN# 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.
6.2 Self Powered Configuration
A USB Self Powered device gets its power from its own power supply and does not draw current from the USB bus.
The EVAL232R is not designed to be used in a USB self powered configuration. However, the FT232R chip can be
used in such a configuration. See the FT232R datasheet for more details on how to do this.
6.3 USB 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.
This can be done using 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.
See the FT232R datasheet for more details, and an example schematic for a bus powered design with power
switching.
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) The PWREN# pin 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
EVAL232R FT232RL USB to RS232 Evaluation Module Datasheet Version 0.90
© Future Technology Devices International Ltd. 2005
Page 14
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 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.
6.4 LED Interface
The FT232RL’s CBUS0 and CBUS1 pins on the EVAL232R are configured to drive LED’s.
CBUS0 is used to indicate reception of data (RXLED#) and CBUS1 is used to indicate transmission of data (TXLED#).
When data is being transmitted or received the respective CBUS pin will drive from tri-state to low in order to provide
indication on the LEDs of data transfer. A digital one-shot time is used so that even a small percentage of data transfer
is visible to the end user.
The FT232R CBUS pins have 3 configurable options for driving an LED - these are TXLED#, RXLED#, and
TX&RXLED#.
EVAL232R FT232RL USB to RS232 Evaluation Module Datasheet Version 0.90
© Future Technology Devices International Ltd. 2005
Page 15
7. Module Circuit Schematic
Figure 5 shows the EVAL232R circuit schematic. For the EVAL232R the FT232RL has been used to make a USB to
RS232 converter. A TTL – RS232 Level Converter I.C. is used on the serial UART of the FT232RL to make the RS232
level conversion. This, for example can be done using the popular “213” series of TTL to RS232 level converters.
These devices have 4 transmitters and 5 receivers in a 28-LD SSOP package and feature an in-built voltage converter
to convert the 5V (nominal) VCC to the +/- 9 volts required by RS232. An important feature of these devices is the SD
pin which can power down the device to a low quiescent current during USB suspend mode.
The RS232 level converter device used on the EVAL232R is a Zywyn ZT213LFEA which is capable of RS232
communication at up to 1Megabaud baud.
In the EVAL232R CBUS0 and CBUS1 have been configured as TXLED# and RXLED#, and are being used to drive
two LEDs which indicate transmission and reception of data.
EVAL232R FT232RL USB to RS232 Evaluation Module Datasheet Version 0.90
© Future Technology Devices International Ltd. 2005
Page 16
Figure 5 - EVAL232R Module Circuit Schematic
EVAL232R FT232RL USB to RS232 Evaluation Module Datasheet Version 0.90
© Future Technology Devices International Ltd. 2005
Page 17
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
EVAL232R are shown in Table 18.
Table 18 - 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 EVAL232R 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
Product Description
EVAL232 Board 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
RXLED#
TXLED#
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 - Receive LED drive
CBUS1
Default configuration of CBUS1 - Transmit LED drive
CBUS2
Default configuration of CBUS2 - Power enable. Low after USB
enumeration, high during USB suspend.
CBUS3
CBUS4
PWREN#
SLEEP#
Default configuration of CBUS3 - Power enable. Low after USB
enumeration, high during USB suspend.
Default configuration of CBUS4 - Low during USB suspend. Used to
power down the EVAL232R’s RS232 level converter IC.
Invert TXD
Invert RXD
Invert RTS#
Invert CTS#
Invert DTR#
Invert DSR#
Invert DCD#
Invert RI#
Disabled
Disabled
Disabled
Disabled
Disabled
Disabled
Disabled
Disabled
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.
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.
EVAL232R FT232RL USB to RS232 Evaluation Module Datasheet Version 0.90
© Future Technology Devices International Ltd. 2005
Page 18
Disclaimer
Copyright © Future Technology Devices International Limited , 2005.
Version 0.9 - Initial Datasheet Created December 2005
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
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EVAL232R FT232RL USB to RS232 Evaluation Module Datasheet Version 0.90
© Future Technology Devices International Ltd. 2005
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