The resistors R2 and R3 forms a voltage sensing feedback network, which is given to the analog pin AN0 of the PIC. The inductor L1, MOSFET Q1, diode D1, capacitors C1 and C4 forms a DC-DC converter (Buck Converter) which converts 5V from PC to 12V, which to be applied to MCLR/VPP pin of a microcontroller at the time of programming. The built-in-clock generator of pic uses external crystal oscillator X1, C2 and C3 to ensure the correct system clock rate. The USB Data+ and Data- from PC are connected to the D+ and D- pins of the PIC182550. USB microcontroller PIC18F2550 is the soul of the PICKit2. PICKit2 is a USB powered device, that is it gets power from PC USB +5V power supply. USB PIC Programmer PICKit2 Modified Circuit Diagram The mini USB connector is replaced by commonly available USB-B connector. Bipolar transistors used in Original PICKit2 are replaced by MOSFETs, thus minimal additional components are required.ĥ. The Programmer-to-go function is not an important feature for a electronics hobbyist.Ĥ. Two 24C512 EEPROM’s used only for programmer-to-go function in the Original PICKit2 were omitted. It supports only 5V PIC’s, thus 3.3V devices a small additional circuit to convert 5V to 3.3V.ģ.
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