AVR-Chat

Hello, David.

You wrote:

  
>  On Feb 13, 2005, at 5:13 AM, Valerij Avrealij wrote:

 >> When I in system program my tiny15 the current more than 200mA!!!
 >> The chip and 7805 are hot. I use Altera ByteBlaster programmer with
 >> special PC software.
 >> Very interesting: when I connect swiched ON ISP the current is normal,
 >> when I OFF it and then ON the current more than 200mA
 >> How this problem can be solved?
 >> P.S. Using this ISP cable I successfull program mega8 chip.

>  The problem is that your 7805 isn't protected against "back feeding."
>  Its trying to regulate its output which is being driven higher than its
>  unpowered input by your ISP cable.

>  You need a different model of regulator, else insert a diode between
>  the existing regulator and the ISP connector.

>  Or you could power your circuit by normal means when using the ISP.
>  This will keep your 7805 happy.


Thanks for your help. How you think, the chip was damaged? Or it can
be used?


-- 

  Valerij Avrealij