AVR-Chat

On 6/20/07, mago Umandam <magzky02@yahoo.com> wrote:
> A series resistor was my first solution but it didnt work because of the the 49 Ohm pull up resistor at the other end of the line. when the uC pin set the line low, the output voltage will become a voltage divider and is quite high unless i will use a very low series resistance (compared to 49) which will defeat my purpose. I can not change the 49 Ohm pullup resistor at the other end because it is another system i just want to control.

Knowing this, I'm wondering why you don't use a 2N7000 or similar
mosfet as a buffer.
It will crank that line to ground, and draw essentially no current
from the AVR while doing it.