Hello,
I have an application for which I'm looking for a simple reset solution.
We have two switches that will ground a pulled up line.
The requirement is both switches need to be pressed for 20 seconds.
At that time, the reset line for the processor will go low, till either switch is released.
The present system has a MAX6751 to do watchdog and voltage monitor, but we need to add the switch requirement.
http://www.maxim-ic.com/datasheet/index.mvp/id/3504
Any ideas for a TI part from the vast portfolio to accomplish this task?
Any feedback, ideas or suggestions are welcomed and appreciated!
Thanks again!
Paul
There's not a dedicated IC for this function, but Texas Instruments has several ICs that can be used as building blocks to perform this function. The TPS3808 and TPS386000 have adjustable reset times that might be useful.
Use the circuit below:
The output is high for about 34 seconds when TRIG1 is pulled low. You can adjust the time on the C1 (22uF).