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Dear E2E member,
I refer the push button reference design as below,
http://www.ti.com/lit/an/scea048b/scea048b.pdf
Now RD want to modify the the circuit which has the function that are long press turn on (2s) and long press turn off (4s).
Could we add the RC delay circuit and make sure the function OK?
Or need to use other parts to resolve this function.
Thanks!
Hi,
What you have designed will work however there are few issues that could arise. For example, if the user held the button for longer than 2 seconds all the way up till the long press 4 second turn off, then the flip flop will clear causing the device to again turn off. There are other ways to make this possible and If you like, I can work on making something like that for you.
Thanks!
-Karan
Dear Karen,
Thanks for you support!
I will discuss it with our customer base on this circuit!
Hi Julian,
I noticed that I missed a schmitt trigger buffer at the input from the button. I have redrawn it as below.
I am still working on finding a way to reduce the components of this circuit. Please let me know what the customer thinks of this so that I can help with finding a solution.
Thanks!
-Karan
Dear Karen,
Could you let us know what the description of "LE" Pin?
I think that is "Low Enable" (active low), so the function is abnormal.
If we long press the button,
2s...turn on (Q=1)
6s(2s+4s)...turn off (Q=0)
8s(2s+4s+2s)...turn on again (Q=1) (???)