ProgBee UART Programmer (Xbee Supported)

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  • Key Specifications
Microprocessor FT232RL
PCB size 3.1cm x 4.1cm
Indicators POWER,Green LED. LEDs for Txd and Rxd
Power supply 3.3V and 5V DC
Interface Mini-B USB, 2.54mm pitch pin header
Adapter socket XBee compatible 2.0mm pitch female pin header
Connectivity USB
Communication Protocol UART, Bit Bang I/O, SPI

  • Electrical Characterstics
Specification Minimum Typical Maximum Unit
Input voltage - 5 5 Vdc
Current Consumption - - 500 mA
Output voltage 3.3 - 5 Vdc
Board pins and features
  • A tiny reset switch is provided for reseting Bee compatible devices.
  • Apart from 2 x 10 Breakout for BEE compatible modules, additional pads for 2 x 10pin headers, 2 x 3 ISP header are provided.Users can solder pin headers appropriately.

BitBang Mode

An nice feature of UartSBee v3.1 compared to other FT232RL based USB-Serial devices is that all the Bit-Bang I/Os are brought to the header pins.

Bit-Bang mode is a special feature of FT232RL in which 8 I/O lines (D0 - D7) can be used as a general purpose bidirectional  I/O lines. Three Bit-Bang modes are supported by FT232RL

  • Asynchronous Bit-Bang mode 

Any data written to the device is clocked to the configured output pins. The rate of data transfer is configured based on baud rate generator. In this mode any of 8 I/O lines can be configured as input or ouput.

  • Synchronous Bit-Bang mode

In this mode data is sent synchronously. An input is read before an output byte is sent to the device. Hence to read input, a write operation must be performed.

  • CBUS Bit-Bang Mode

This is a special mode which requires reprogramming of FT232RL EEPROM. This uses signals C0 - C3.

Bit-Bang Mode of FT232RL is well documented in the application note[1]

Table: Bit-Bang I/O Mapping

UartSBee Signal BitBang I/O Signal
TxD D0
RxD D1


  • See FTDI on this page.