Hi All,
I have to design a circuit which will detect if there's TTL communication from a micro-controller.
When there's no communication for 4-5 minutes it should send a 1s reset signal (positive).
I'm trying to do that with discrete elements but I'm wondering if there's already a device (IC/circuit) which does it.
I have it working now but I used 3x 555-timer, 5x transistor, 12x resistor and 6x capacitor.
I have a feeling that it can be done much easier and I'm just reinventing the wheel here.
Some considerations:
It can send only one signal even if reset doesn't work (that is: TTL communication never comes back).
I don't mind if the circuit sends the reset signal at power on.
The circuit will work on 3.3V
Cheers for any thoughts.
I have to design a circuit which will detect if there's TTL communication from a micro-controller.
When there's no communication for 4-5 minutes it should send a 1s reset signal (positive).
I'm trying to do that with discrete elements but I'm wondering if there's already a device (IC/circuit) which does it.
I have it working now but I used 3x 555-timer, 5x transistor, 12x resistor and 6x capacitor.
I have a feeling that it can be done much easier and I'm just reinventing the wheel here.
Some considerations:
It can send only one signal even if reset doesn't work (that is: TTL communication never comes back).
I don't mind if the circuit sends the reset signal at power on.
The circuit will work on 3.3V
Cheers for any thoughts.