Внутрисхемное программирование, большой отход контроллегов при внутрисхемном прогр. Опции

[Серёга_1]

Проблема!!!!
При программировании по внутрисхемному интерфейсу сыходят из строя конттроллеры (не функционируют, мертвые). Схема рабочая(перепайка процессора и работаем).
Питание при программировании от программатора.

Питание подается , считываются программатором, перепрограммируются, верификация ОК!, но не работают. И таких доходит до 10%, от общего кол-ва.

Контроллер: PIC12F675
Конфигурация: __CONFIG(UNPROTECT & BOREN & MCLRDIS & PWRTEN & WDTEN & INTIO); (HT PICC)
Программатор: ChipProg+ , ПО версия V. 3.95.00 или V. 4.00.12 Beta

[J.Bond]

вот еще выдержка из хелпа к винпику:
Programming a PIC16F84 works, but programming a 16F628 does not work with my programmer - why ?
There is a major difference in the programming specifications. Most newer devices require a very fast rise on Vpp and / or Vpp (less than 50 microseconds between them) which is impossible with some of the "extremely simple" programmers I have seen on the web. The problem is, if the PIC starts executing its code because Vdd (the supply voltage) is present, but Vpp (the programming voltage) is not raised to say 12 Volts fast enough. So the program counter will not be zero when entering programming mode, and programming will fail for this reason. Get or borrow a two-channel oscilloscope and measure these voltages. If there is a slowly rising edge on the Vpp pin, throw those large electrolyte caps out to make the rise time faster. Or, invest a few pennies / cents for a few transistors and build a better interface.
There is a workaround for this problem when using the JDM programmer: WinPic sets all control lines HIGH for about 500ms, which should discharge all capacitors, before applying the Vpp voltage. I tried this successfully with a PIC12F675, where the MCLR-input had been disabled previously, and had no problem when trying to overwrite the chip. If this doesn't work with your JDM programmer, let me know, maybe making the 500ms discharge interval even longer helps. About the JDM programmer and oscilloscopes: DO NOT CONNECT THE OSCILLOSCOPE TO THE PIC'S GROUND - the scope's ground will most likely be connected to the PC's ground, which causes a short circuit for the JDM programmer's tricky supply voltage !

это типо транзистор пошустрее надо, поскольку конденсаторов то нету. Или както управлять питанием +5в...

Сообщение отредактировал J.Bond - Nov 26 2006, 13:33