Post by thread:PIC Serial Prog Vpp current

Does anyone know what the ACTUAL max and average Vpp (~13V) current draw is??? My look at Microchips max rating seems conservatively high. I understand that this must depend on whether we are dealing with EPROM EEPROM or Flash but these are all voltage driven processes involving small charge 'packets' (rather than e.g. PAL metal fuse zapping).. I will try to measure it if I'm sufficiently curious but my 'lab' equipment (and ingenuity??) are limited. The hardware equivalent af the (Linux/FreeUnix?) software saying: "With enough eyes all bugs are shallow" is something like: With sufficient lab gear (and the knowledge of how to use it) most hardware questions are easy. RMM

> Does anyone know what the ACTUAL max and average Vpp (~13V) > current draw is??? For 16c84 / 16f84 I think it's ~ 2 mA. My programmer uses a charge pump to create the 13V, if the current were higher this would never work. Wouter.

w. v. ooijen / f. hanneman wrote: >> Does anyone know what the ACTUAL max and average Vpp (~13V) >> current draw is??? > For 16c84 / 16f84 I think it's ~ 2 mA. Document DS30262A, the *programming* manual for the 16F84, page 12 quotes 200 µA as maximum. I think at that rate you can ignore "typical". Maximum *supply* (Vdd) current is however quoted at 50 mA though many argue this is conservatively very high. The EPROM parts OTOH draw significant programming current (many milliamps) from Vpp/~MCLR, and IIRC, less from the Vdd supply. -- Cheers, Paul B.