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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But this happens even with 1k resistor on Input 4.

The CDB Output is grounded via a k resistor, so that unconnected ports read 0. I’m a bit lost to what the problem could be. Home Questions Tags Users Unanswered.

LawrenceNK1G, I’m going to read a lot of things, like pots, voltage dividers etc. I’m using a breadboard of questionable quality. Email Required, but never shown. 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.

If I read only port 4 for 30 seconds, it starts to read correctly and stable. At the datashedt least, connect a pullup resistor of about 10K between IN and the 5V power source. I’d try datwsheet a different board.

Sign up using Facebook. Wouldn’t the digital pins be able to sink fast enough that the IC would mux correctly?

(PDF) CD4051B Datasheet download

The IC has internal protection circuits. If I start reading random ports between 0 and 7it reads correctly for about 10 seconds, then suddenly starts reading zero. This means that this chip will not work with 3. I’ve connected the input to 5V for testing stability of the reading. Datasheet simulate this circuit — Fatasheet created using CircuitLab I’ve connected the input to 5V for testing stability of the reading.


CDB Datasheet(PDF) – TI store

Is there a better alternative? But it changes nothing. I’m using digitalWrite on three pins to datssheet the input port, and then waiting delay for 30ms before doing an analogRead on A0. Also the pulldown resistor need not be that high.

However, the control inputs require CMOS digital levels. But perhaps I can calibrate dataxheet. The Arduino has about 10Mohm resistance on the input side, so it shouldn’t make a difference, but the max reading was about instead of The is an analog multiplexer – it can switch analog signals between Vee Sign up or log in Sign up using Google. What is cd40051b signal source that you’re reading?

I’m trying to multiplex an analog input port on an Arduino Uno. Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. From the Arduino wiki page, it reads “Futhermore, the is able to work with analog values; in the case of the Arduino, you are able to use the analog inputs with a voltage between V and route them to an Analog-In Pin on your Arduino.


A 10K resistor works well in most cases. Sign up using Email and Password. Problematic breadboards cause loose connections within the board which you cannot see and hence lead to situations such as open connections etc.

I’ve programmed a small routine that checks for consistency of the signal reading. Your drawing does not correspond with the nomenclature of the chip.

It still goes to zero. I did try to add a 10k resistor in series with the input, but it changed the output. I saw a comment on the ‘arduino’ board which said that “the for loop repeatedly cycles count from 0 to 7, so [selector pins] cr4051b average 2. Post as a guest Name. I’ve tried changing the pull-down resistor. I’ve also tried adding a 1uF capacitor.

Is it possible cd4501b they are getting triggered? Still, I was hoping for a method that wouldn’t tamper with the input signal in any way: So – tell more about what is connected on the analog mux pins?

That is what seems to be the source of your problems.