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 Arduino has about 10Mohm resistance on the input side, so it shouldn’t make a difference, but the max reading was about instead of I’ve also tried adding a 1uF capacitor. Still, I was hoping for a method that wouldn’t tamper with the input signal in any way: If I read only port 4 for 30 seconds, it starts to read correctly and stable.
Cd44051b still goes to zero.
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I’m trying to multiplex an analog input port on an Arduino Uno. Though this may not be cd405b relevant in this case, its important to note that the B is a CMOS device and hence anything less than 1. I’m using digitalWrite on three pins to select the datashret port, and then waiting delay for 30ms before doing an analogRead on A0.
From the Arduino wiki page, it reads “Futhermore, the is able to work dtasheet 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.
But this happens even with 1k resistor on Input 4. Sign up using Facebook. I did try to add a 10k resistor in series with the input, but it changed the output.
You show that you’ve got your “Signal” leads connected to the select inputs. But the documentation on their website is generally incredibly poor, so I wouldn’t be surprised. If I start reading random ports between 0 and 7it reads correctly for about 10 seconds, then suddenly starts reading zero.
I’ve connected the input to 5V for testing stability of the reading. The value then starts reading randomly. I’ve tried removing dataaheet pull-down resistor. However, the control inputs require CMOS digital levels.
(PDF) CD4051B Datasheet download
Problematic breadboards cause loose connections within the board which you cannot see and hence lead to situations such as open connections etc. I’d try using a different board. Look at page 4 of this guide. The IC has internal protection circuits.
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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. But perhaps I can calibrate it. Is there a better alternative? Wouldn’t the digital pins be able to sink fast enough that the IC would mux correctly?
Multiplexer CDB gives strange readings – Electrical Engineering Stack Exchange
I’m a bit lost to what the problem cd4501b be. Sign up or log in Sign up using Google. I’ve experimented with various delay times, and 30ms seemed to improve things a lot when reading sequantially 0, 1, 2, I’ve programmed a small routine that checks for consistency of the signal reading. A 10K resistor works well in most cases. Email Required, but never shown.