I have a legacy board in my product that has 1 temperature input with 2 rtd temperature probes.
Until the new boards are ready the manufacturer has used a relay already mounted on the board to switch between the 2 RTD's. The relays are not reliable enough and keep failing.
The board has some spare Open Drain outputs that I want to use to switch a 4052 Multiplexer between the 2 rtd probes, replacing the relay function.
The 4052 multiplexer needs +5V at VSS and at "A" the logic pin. I can get +5V from the board, but how do I use Open Drain to switch +5V at "A" the logic pin?
I'm guessing pulling A high with a 4k7 to +5V and then somehow pulling it low with a transistor connected to the open drain pin? But I'm not too sure.