PCF8574A INT Problem

[Pesticida]

I forgott to say that this Problem is happen just when the voltage is slow decreasing!
I think that I should use a Schmidt Trigger between Input and pcf8574A.

Regards Pesti

[skimask]

I forgott to say that this Problem is happen just when the voltage is slow decreasing!
I think that I should use a Schmidt Trigger between Input and pcf8574A.
Regards Pesti

Or use a high value pullup resistor...unless it's that slow voltage drop that you're looking for.

[Pesticida]

Hi Skimask,

No I'm not looking for Slow Voltage drop,I need a Secure Alarm Device,this was just a coincidence that I found this Error.

I can use the Device in two Mode :

Mode1 = On/Off to Ground
Mode2 = Voltage On/Off Between 5-15 Volt

The Problem is that when the Input Pin Voltage is going Slow from High to ~ < 1.9 Volts then the INT switch to Low and is remaining Low.

Regards Pesti