DLP-UC232R-10 datasheet, PDF - EEWORLD Datasheet

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DLP-UC232R-10: DescriptionUSB Cables / IEEE 1394 Cables From FTDI UC232R "CH iPi 10cm USB-SER CBL; CategoryWire/cable; File Size394KB，11 Pages; ManufacturerDLP Design

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USB Cables / IEEE 1394 Cables From FTDI UC232R "CH iPi 10cm USB-SER CBL

DLP-UC232R-10 Parametric

Parameter Name	Attribute value
Product Attribute	Attribute Value
Manufacturer	DLP Design
Product Category	USB Cables / IEEE 1394 Cables
Product	USB Cables
Type	Converter Cable
Connector End A	USB Type A
Connector End B	DB9
Gender	Male / Male
Color	Black
Number of Conductors	3 Conductor

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™

Future Technology Devices International Ltd.

UC232R “ChiPi”

Minimum Component

FT232RL USB to RS232

Converter Cable

Incorporating Clock Generator Output

and FTDIChip-ID™ Security Dongle

The

UC232R

“ChiPi” is a USB to RS232 converter cable incorporating 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. It has

been designed to use the minimum number of

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 UC232R is supplied on a 16.2 mm x 41.3mm

(0.6” x 1.6”)

PCB, including the DB9 connector. A 295mm (11.8”)

USB cable with USB ‘A’ plug is ﬁtted. All components used, including the FT232RL and RS232 level converter IC are

Pb-free (RoHS compliant).

2. Features and Enhancements of FT232R

2.1 FT232R Key Features

Page 3

This section summarises the key features and enhancements of the FT232R IC device which is used on the UC232R

“ChiPi” USB to RS232 converter cable. 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.

UC232R “ChiPi” Minimum Component FT232RL USB to RS232 Converter Cable

Datasheet Version 0.90

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 +

where n can be any integer between 2 and 16,384 ( = 2

) and

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,

= 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.

UC232R “ChiPi” Minimum Component FT232RL USB to RS232 Converter Cable

Datasheet Version 0.90

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