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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The is an analog multiplexer – it can switch analog signals between Vee I’m a bit lost to what the problem could be.
However, the control inputs require CMOS digital levels. LawrenceNK1G, I’m going to read a lot of things, like pots, voltage dividers etc.
Datasheet simulate this circuit — Schematic created using CircuitLab I’ve connected the input to 5V for testing stability of the reading. It still goes to zero.
I did try to add a 10k resistor in series with the input, but it changed the output.
So – tell more about what is connected on the analog mux pins? 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.
Sign up or log in Sign up using Google. Look at page datasehet of this guide. 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.
A 10K resistor works well in most cases. Home Questions Tags Users Unanswered. I’ve connected the input to 5V for testing stability of the reading. I’m using digitalWrite on three pins to select the input port, and then waiting delay for 30ms before doing an analogRead on A0. I haven’t seen the block diagram for the chip but it seems that you may be shorting something internally inside the chip which is why the input drops to 0V after a short time.
The IC has internal protection circuits. But datsheet changes nothing. Is there a better alternative? But this happens even with 1k resistor on Input 4. But perhaps I can calibrate it. I’m trying to multiplex an analog input port on an Arduino Uno. Post as a guest Name. If I start reading random ports between 0 and 7it reads correctly for about 10 seconds, then suddenly starts reading zero.
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At the very least, connect a pullup resistor of about 10K between IN and the 5V power source. I’ve also tried adding a 1uF capacitor. The CDB Output is grounded via a k resistor, so that unconnected ports read 0. Sign up using Email and Password.
CDB Datasheet(PDF) – TI store
I’ve experimented datashedt various delay times, and 30ms seemed to improve things a lot when reading sequantially 0, 1, 2, Email Required, but never shown.
I’ve tried changing the pull-down resistor.
Also the pulldown resistor need not be that high. I’m using a breadboard of questionable quality. That is what seems to be the source of your problems. What is the signal source that you’re reading?
(PDF) CDB Datasheet PDF Download – CMOS Analog Multiplexers / Demultiplexers
Still, I was hoping for a method that wouldn’t tamper with the input signal in any way: I’d try using a different board. Sign up using Facebook. But the documentation on their website is generally incredibly poor, so I wouldn’t be surprised. If I read only port 4 cd40551b 30 seconds, it starts to read correctly and stable.
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 Problematic breadboards cause loose connections within the board which you cannot see and hence lead to situations dd4051b as open connections etc. I saw a comment on the ‘arduino’ board which said that “the for loop repeatedly cycles count from 0 to 7, so [selector pins] will average 2. The value then starts reading randomly.
This means that this chip will not work with 3.
(PDF) CD4051B Datasheet download
Ideally something that would allow multiplexing without distorting the signal. Your drawing does not correspond with the nomenclature of the chip. You show that you’ve got your “Signal” leads connected to the select inputs.