![]() Removed jumper will disconnect voltage from the “translated” side, and you have to provide this voltage from target chip to allow programmer to work. For voltage reduction, LDO MCP1825S-3302ED stabilizer is used – but you can use any pin-compatible one, like LF33. Short the 1 and 2 for 5V, or 2 and 3 for 3,3V. Under IDC sockets a voltage selection jumper is placed – you can select voltage which can be used to power your target chip. Code change is very simple, it is made trough built-in USB bootloader and free tool from Atmel – FLIP. Vias placed under the at90usb162 chip derives its other free pins to pads on the bottom side of pcb – so circuit can be used also as a test board for other codes using hardware USB. Vias are not placed under chip or other elements so they can be made with a wire. PCB just looks complicated, but it can be also homemade. They allows to programm all of available Atmega, Attiny, and Xmega chips. Programmer has a three IDC 6pin sockets to provide support for three programming protocols: ISP, PDI, and TPI. This change also need a change of code, which is described in last link – code in attachment is already moded – original will work incorrectly. I used MAX3002 in place for original GTL2003 translator, exactly like author of the PL version – this chip is more available. Circuit built and based on LUFA project (link), programmer inspired by USBTiny-MKII (link), and USBTiny MKII PL (link). ![]()
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