Data sheet acquired from Harris Semiconductor. SCHSD. CAUTION: The CDB, CDB, and CDB analog multiplexers are digitally-controlled . Product data sheet. Rev. 12 — 25 March 4 of Nexperia. HEFB. 8- channel analog multiplexer/demultiplexer. Fig 5. Logic diagram. An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in . Product Folder Links: CDB CDB CDB.
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Your drawing does not correspond with the nomenclature of the chip. I’m using a breadboard of questionable quality. The CDB Output is grounded via a k resistor, so that unconnected ports read 0. Also the pulldown resistor need not be that high. Is there a better alternative?
If I datsaheet reading random ports between 0 and 7it reads correctly for about 10 seconds, then suddenly starts reading zero. Wouldn’t the digital pins be able to sink fast enough that the IC would mux correctly? Problematic breadboards cause loose connections within the board which you cannot see and hence lead to situations such as open connections etc.
I’ve also tried adding a ddatasheet capacitor. Though this may not be very relevant in this case, its important to note that the B is a CMOS device and hence anything less than 1.
It still goes to zero. I’d try using a different board. But this happens even with 1k resistor on Input 4. Look at page 4 of this guide. Ideally something that would allow multiplexing without distorting the signal. I’m using digitalWrite on three pins to select the input port, and then waiting delay for 30ms before doing an analogRead on A0.
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(PDF) CDB Datasheet PDF Download – CMOS Analog Multiplexers / Demultiplexers
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Email Required, but never shown. Post as a guest Name. I’ve tried removing the pull-down resistor.
The Arduino has datashedt 10Mohm resistance on the input side, so it shouldn’t make a difference, but the max reading was about instead of The IC has internal protection circuits. But it changes nothing. LawrenceNK1G, I’m going to read a lot of things, like pots, voltage dividers etc. That is what seems to be the source of your problems. But the documentation on their website datxsheet generally incredibly poor, so I wouldn’t be surprised.