Hi,
I am looking at using the MAX22191 device as a digital binary input on a circuit / PCB Module
The MAX22191 is a Ultra-Low-Power, Parasitically Powered Digital Input which typically accepts a 24V input. I want to use this device to then drive an opto coupler and then in turn a MCU. I have a single prototype PCB made which is working perfectly on the bench.
But my question or concern is that I want to drive 32 of these devices from one 24V signal. So basically, 32 of these boards all about 5M apart all driven by on 24V signal. Each input has a TVS diode and should draw less than 3mA. So when the 24V signal switches on all devices or boards on the 'network' will see a logic high and when the 24V is switched off (0V) then the inputs will see a low.
Will driving 32 (Maybe more) of these devices over maybe 100M plus of 1.5mm2 cable be ok, or will the effect of having these all in parallel cause a problem. These IC's are a digital industrial input which I assume would normally only be driven by one sensor or industrial digital output such as a PLC output.
The next question is what is the best way to drive these. A simply relay switching a 24V supply may work but what about using a dedicated push / pull industrial digital output of some description or even a high side driver. But it would really need to switch to 0V for a low rather than just OC.
Any thoughts on this would be really apricated.
Thanks
I am looking at using the MAX22191 device as a digital binary input on a circuit / PCB Module
The MAX22191 is a Ultra-Low-Power, Parasitically Powered Digital Input which typically accepts a 24V input. I want to use this device to then drive an opto coupler and then in turn a MCU. I have a single prototype PCB made which is working perfectly on the bench.
But my question or concern is that I want to drive 32 of these devices from one 24V signal. So basically, 32 of these boards all about 5M apart all driven by on 24V signal. Each input has a TVS diode and should draw less than 3mA. So when the 24V signal switches on all devices or boards on the 'network' will see a logic high and when the 24V is switched off (0V) then the inputs will see a low.
Will driving 32 (Maybe more) of these devices over maybe 100M plus of 1.5mm2 cable be ok, or will the effect of having these all in parallel cause a problem. These IC's are a digital industrial input which I assume would normally only be driven by one sensor or industrial digital output such as a PLC output.
The next question is what is the best way to drive these. A simply relay switching a 24V supply may work but what about using a dedicated push / pull industrial digital output of some description or even a high side driver. But it would really need to switch to 0V for a low rather than just OC.
Any thoughts on this would be really apricated.
Thanks