The Window throws error as "low VDD voltage. 4.5 volts is expected but the actual voltage is 4.2 /4.3 Volts both in the measured space in application & measured with multimeter.
First step of VDD calibration returned error. I tried to proceed as " TOOLS->TROUBLESHOOT Its returning "calibration cannot be done. In VDD & calibration dialog i am not able to do calibration. As soon as i open pic kit 2 application the error window saying "VPP error" pops outĢ. Heating problem of inductor gone away after i replaced the 2N3094 transistors.ġ.
Pic and eeprom programmer circuit serial#
I am successful in downloading the firmware into 18F2550 via serial programmer and Pic Kit clone is detected in PC. I did the pic clone referring your guidelines here. Good work, Gaurav!īefore i start i shall express my sincere Thanks to You for all the works :)Īm a newbie to PCB and schematics like these and i know nothing on this.
Pic and eeprom programmer circuit series#
Now everything works as charm (Vdd, Vpp, calibrating, programming). Multi PIC Programmer Circuit EEPROM programming from the RS232 port is doing quite well supply circuit on the PCB using WinPick 800 programs and 24lcxx 12Fxxx 16Cxxx 16Fxxx 18Fxxx PIC 24Cxx series 24xx series EEPROM can be programmed. The USB voltage may be too low to completely calibrate." does occur. Xeltek in-system programming tools provide a convenient method for configuring microcontrollers and various serial devices. Although the hint in Pickit 2 says "4.000", the comma is just fine, otherwise an error "Could not fully calibrate the unit. Some EEPROMs can be programmed in-circuit with ISP header cable, please refer to our ISP programming page for connecting the chip on target board to the programmer. when inserting the measurement 4.x Volts (e.g. This also depends on the type of the BD140 transistors used.Ī hint: if you stay in country where the decimal delimiter is comma (,), not punctuation (.), try to use comma when calibrating in Pickit2 -> Tool -> VDD Calibration. Normally the R24 should be 10x R25 (1k) but I stayed as low as possible. 330E is simply closing the Q3 (BD140) too soon.
This helped to get the voltages down to 2.5V.
This helped to be able to adjust Vdd from 4.97V down to 2.7V (not to 2.5V!) Changed LM358 to MCP6002 (rail-to-rail op-amp, very cheap) Removed R36 (which does not exist in latest HW version)Ģ. Built the board even before R36 (240E) was removed but faced some problems regarding Vdd calibrations.Here is the summary what I changed in order to pass all tests successfully:ġ. Just want to share some of my experiences.