Other Parts Discussed in Thread: TIDA-00879, , TIDA-01012
Hi.
I am inspired by the AFE design in TIDA-01012 and TIDA-00879 where the TS5A3359 multiplexer is used for resistive voltage divider network selection. I am designing a similar scenario where I want to measure three different sensors (A,B,C) as shown in the sketch below. I am planning to use a design similar to the one on the left. The voltages at A,B and C can be as high as +-100V peak with respect to COM (the yellow point).
The reference Design TIDA-01012 has a maximum input of 50V but due to the voltage divider I am guessing that 100 V is also possible in this design. My qestion is: what happens when TS5A3359 is powered off (Vcc=0) but the input voltages (A,B, C) are still available. Does it create any damage to the multiplexer? Also do you see any problem when the mux is connected on the high side as in the sketch on the right?
The reason I want to use a mux is that the sensors (A, B and C) are also in a resistive network between eachother and I dont want to introduce parallel paths from the measuring circuit .