Part Number: FT232RQ-REEL

Manufacturer: Future Technology


Shipped from: Shenzhen/HK Warehouse

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FT232RQ-REEL Description

The FT232R is a USB to serial UART interface device that can simplify USB to serial designs and reduce the number of external components needed. Using an external EEPROM in its entirety, USB termination resistors, and an integrated clock circuit into the device itself. The integrated clock circuit does not require an external crystal to function. It was made to work well with a USB host controller by using as little of the USB bandwidth as possible.

FT232RQ-REEL Features

  • The FT232R has the following superior characteristics as a USB to serial UART interface:
  • USB to asynchronous serial data transfer using a single chip.
  • All of the work for the USB protocol is done in silicon. There is no need to write firmware that is USB-specific.
  • There is a built-in, 1024-bit EEPROM for saving device descriptions and CBUS I/O settings.
  • Internal USB termination resistors are included in.
  • No extra crystal is needed for the on-board clock generator, and a selectable clock output allows for a solderless connection to an external MCU or FPGA.
  • With the use of buffer smoothing technology, the 128-byte receive buffer and the 256-byte transmit buffer can support a large amount of data.
  • There is typically no need for custom USB driver development thanks to FTDI’s free Virtual Com Port (VCP) and Direct (D2XX) drivers.
  • Specialized USB FTDIChip-IDTM functionality.
  • Adaptable I/O pins for the CBUS bus.
  • Transfer LED drive signals back and forth.
  • 7 or 8 data bits, 1 or 2 stop bits, and odd/even/mark/space/no parity are all supported by the UART interface.
  • High data throughput is achieved by using FIFO’s transmission and reception buffers.
  • Several bit bang interface modes including synchronous and asynchronous communication through RD# and WR# strobes.
  • Individual USB serial number assigned to device at time of shipment.
  • All USB configurations, including bus-powered, self-powered, and high-power bus-powered, are supported.
  • Built-in +3.3V USB I/O level converter.
  • UART and CBUS both feature an integrated level converter for operation with logic levels between +1.8V and +5V.
  • Real CMOS drive output of 5V/3.3V/2.8V/1.8V, and TTL input.
  • Adaptable output current for I/O pins.
  • Circuitry for power-on reset is included in.
  • There is no need for additional filtering; the AVCC supply itself is filtered.
  • Option to invert signals on a UART.
  • From +3.3V (with an external oscillator) to +5.25V (internal oscillator) Use of a Sole Source of Supply.
  • USB suspend and operational current are both low.
  • Slow USB use.
  • Supports host controller interfaces including UHCI, OHCI, and EHCI.
  • A port that supports the full speed of USB 2.0.
  • There is a wider temperature window of operation, from -40 degrees to 85 degrees, provided.
  • Both the 28-pin SSOP and the 32-pin QFN-32 packages are lead-free (both RoHS compliant).

FT232RQ-REEL Typical Applications

  • Converters for RS232, RS422, and RS485.
  • USB Upgrade for Older Peripherals.
  • USB data transmission cables and interfaces for cellular and cordless phones.
  • connecting designs based on MCU, PLD, and FPGA to USB.
  • USB Audio and Low Bandwidth Video data transmission.
  • Data transfer from a PDA to USB.
  • Smart card readers for USB.
  • Instrumentation for USB.

FT232RQ-REELFunction Description

The FT232R is a USB-to-serial UART interface device that can simplify USB-to-serial designs and reduce the number of external components used. This is possible because the device has an external EEPROM, USB termination resistors, and an integrated clock circuit all built into it. The clock circuit does not require an external crystal. It was made to work well with a USB host controller by using as little of the USB bandwidth as possible.

Functional Block Descriptions

● Internal EEPROM

The FT232R has an inbuilt EEPROM that is used to store different USB configuration descriptors. These include the USB Vendor ID (VID), the USB Product ID (PID), the device serial number, and the product description string. Also, the functions of the CBUS pins can be set up using the EEPROM that is built into the transceiver. eiver. SysSystem designers have access to a user area of the EEPROM in the device, which lets them store more information. Programming of the internal EEPROM descriptors can be done in circuit and sent over USB without any extra voltage requirements.

● +3.3V LDO Regulator

The +3.3V LDO regulator makes the +3.3V reference voltage, which is used to power the cell output buffers of USB transceivers. In order for the 3V3OUT regulator to work properly, an external decoupling capacitor must be connected to the output pin. Moreover, it supplies power of +3.3V to the internal pull-up resistor of USBDP, which is 1.5k. Instead of providing power to external circuitry, the LDO’s primary job is to supply electricity to the USB as well as the reset generator cells. On the other hand, it can be put to use to power external circuitry that calls for a nominal supply of +3.3 volts and a current of up to 50 milliamps.

● USB Transceiver.

The USB Transceiver Cell supplies the USB cable with a full-speed physical interface that is compatible with both USB 1.1 and USB 2.0. The output drivers are responsible for signaling at a +3.3V level to control the slew rate, and an input differential receiver, adding to two receivers with only one type of input, is responsible for providing USB data in, single-ended zero (SE-0) detection, and USB reset detection, respectively. This function also integrates the internal USB series termination resistors on the USB data lines as well as a 1.5K pull up resistor on the USBDP line.


The Serial Interface Engine (SIE) block gets the recovered clock and data signals from the USB DPLL cell, which creates these signals by latching on to the incoming NRZI USB data.

● Internal 12MHz Oscillator

The internal 12 MHz oscillator cell is responsible for producing a reference clock that is 12 MHz. This serves as an input for the function known as the x4 clock multiplier. In addition to this, the SIE, USB Protocol Engine, and UART FIFO controller blocks all make use of the 12 MHz oscillator as their reference clock.

● Clock Multiplier / Divider

The Clock Multiplier/DDivider, which gets a 12 MHz input from the Internal Oscillator function, makes the 48 MHz, 24 MHz, 12 MHzz, and 6 MHz reference clock signals. The USB DPLL and the Baud Rate Generator blocks both use the 48-bit Mhzlock reference in their operations.

● An example of a Serial Interface Engine (SIE)

The Serial Interface Engine, which is also called the SIE block, changes USB data from parallel to serial and serial to parallel. The USB 2.0 specification calls for functions like bit stuffing and un-stuffing as well as the creation of CRC5 and CRC16. Moreover, the CRC check on the USB data stream is performed.


In conclusion, the FT232RQ-REEL is a great USB-to-serial interface device that makes USB-to-serial designs easier and cuts down on the number of external parts needed. Its advanced features, like adaptable I/O pins, USB FTDIChip-IDTM functionality, and 1024-bit EEPROM, give system designers more functionality and flexibility.

Also, it can work in a wider range of temperatures, which makes it useful for a wide range of applications and an important component for system designers. If you’re looking to purchase the FT232RQ-REEL or any other components for your project, ICRFQ is the go-to supplier for top-notch customer service and high-quality products. Click here to order from ICRFQ and take the first step towards successfully completing your project.

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