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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I’ve experimented with various delay times, and 30ms seemed to improve things a lot when reading sequantially 0, 1, 2, What catasheet the signal source that you’re reading? Still, I datashest hoping for a method that wouldn’t tamper cd4051v the input signal in any way: 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.
If I read only port 4 for 30 seconds, it starts to read correctly and stable. But this happens even with 1k resistor on Input 4. Look at page 4 of this guide. At the very least, connect a pullup resistor of about 10K between IN and the 5V power source.
CDB Datasheet(PDF) – TI store
The value then starts reading randomly.
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. Problematic breadboards cause loose connections within the board which you cannot see and hence lead to situations such as open connections etc. If I start reading random ports between 0 and 7it reads correctly for about 10 seconds, then suddenly datasyeet reading zero. I’m using a breadboard of questionable quality. Datasheet simulate this circuit — Schematic created using CircuitLab I’ve connected the input to 5V for testing stability of the reading.
Wouldn’t the digital pins be able to sink fast enough datwsheet the IC would mux correctly? But the documentation on their vatasheet is generally incredibly poor, so I wouldn’t be surprised. Ideally something that would allow multiplexing without distorting the signal. 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.
I’ve tried removing the pull-down resistor.
I’ve programmed a small routine that checks for consistency of the signal reading. Sign up using Facebook.
So – tell cd4051g about what is connected on the analog mux pins? Your drawing does not correspond with the nomenclature of the chip. I’m a bit lost to what the problem could be.
However, the control inputs require CMOS digital levels. Is there a better alternative? The CDB Output is grounded via a k resistor, so that unconnected ports read 0. Sign up or log in Sign up using Google. I’ve connected the input to 5V for testing stability of the reading.
(PDF) CDB Datasheet PDF Download – CMOS Analog Multiplexers / Demultiplexers
I’ve also tried adding a 1uF capacitor. But it changes nothing. That is what seems to be the source of your problems. 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 cd4501b time. You show that you’ve got your “Signal” leads connected to the select inputs.
I imagine it could be something with capacitance on the ports, but I have the impression that the multiplexer is actually supposed to support very fast switching?
(PDF) CD4051B Datasheet download
Post as a guest Name. Is it possible that they are getting triggered?
I’ve tried changing the pull-down resistor. A 10K resistor works well in most cases.
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Sign up using Email and Password. Home Questions Tags Users Unanswered. It still goes to zero.