ProgBee UART Programmer (Xbee Supported)

Schematic

• 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
ROHS	YES

• 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
RTS	D2
CTS	D3
DTR	D4
DSR	D5
DCD	D6
RI	D7

Documents

• See FTDI on this page.