'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.
w. v. ooijen / f. hanneman
> 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.
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
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.
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