PicoJTAG Manual/Connectors and Jumpers
From Manuals
The following image shows where the connectors and jumpers are located on the picoJTAG.
Power and USB Connector
The picoJTAG is powered from the USB port of a computer through the J2 micro USB connector. The typical current draw of the picoJTAG is 85 mA.
JTAG Connector
The JTAG connector (J1) plugs directly into a standard 20-pin ARM JTAG connector. Some target boards allow power on pin 19 of the JTAG connector. Placing a jumper on JP1 will apply +5V from the computers USB port to pin 19 of the JTAG connector. Please be sure that the target board does not draw more than 400 mA. Figure 3.1 shows the pin out for the JTAG connector and figure 3.2 shows the pin out for JP1.
Virtual COM Port (COM1)
The second channel of the FT2223H is configured as a virtual COM port and is level shifted to RS-232 levels. COM1 can be accessed through a 2x5 pin berg header. Please see figure 3.3 for the pin out of COM1 (J3). The picoJTAG's COM1 supports software handshaking (XON/XOFF) and is considered to be Data Communication Equipment(DCE). To communicate to Data Terminal Equipment (DTE) a straight through cable is needed. To simplify interfacing to devices using hardware handshaking, a loopback is implemented on the modem control signals, from RTS to CTS and from DTR to CD and DSR. Note that the loopbacks do not provide flow control so software handshaking should be used when proper flow control is desired.
