Product Support: Wellon VP-299 Universal Programmer
Product: Wellon VP-299 Universal Programmer
VP-299 and 22V10 DevicesThe VP-299 struggles with some 22V10 PLDs, especially Lattice but sometimes some Atmel devices as well. 16V8 will occasionally give the same problem and some Atmel 89S microcontrollers. The software will give an Over-current error. This is due to the high programming current required by these chips.
To increase the programming current, two SMD resistors need to be changed. This will not damage the programmer as the standard resistors fitted are very conservative.
Resistor Change
To open the case, remove the feet as screws are under them.
Resistor R17 (220R) needs to be changed to 270R
Resistor R28 (39R) needs to be changed to 51R
Resistors need to be 0805 size, typically 1% tolerance and 1/8W power.
270RFor example, RES SMD 270 OHM 1% 1/8W 0805, Digikey part number 541-270CCT-ND
Or Farnell part number 2141320, SMD Chip Resistor, 270 ohm, CRCW Series, 150 V, Thick Film, 0805 [2012 Metric], 125 mW
51RFor example, RES SMD 51 OHM 1% 1/8W 0805, Digikey part number 311-51.0CRCT-ND
Or Farnell part number 1469944, SMD Chip Resistor, 51 ohm, CRCW Series, 150 V, Thick Film, 0805 [2012 Metric], 125 mW
VP-598 and VP-798 have better current on programming voltage and will not have this problem
