CD Datasheet, CD Single 8-channel Multiplexer/Demultiplexer Datasheet, buy CD Data sheet acquired from Harris Semiconductor .. CD MHz. VOS at Any Channel. MHz. Electrical Specifications Common Conditions Here: If. CDBMS, CDBMS and CDBMS analog multi- plexers/ demultiplexers are digitally controlled analog switches having low ON impedance and very.
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The current will always be 1 mA whatever value the resistor has. I checked with local supplier and they dont have this available. Kindly let me know if there are any mistakes or improvements in the above scheme. I am only now interested in 3-wire PT sensors as these are what available locally at affordable prices. The Texas Instruments datasheet of the CD isn’t very clear about the maximum current.
If any errors or possible limitations please do let me know. It is not possible to read or write more than one pin on the at the same time, because you can only select one pin at a time. Arduino on other Chips. It is not possible to read or write more than one pin on the at the same time, because you can only select one pin at a time.
You may be better off expending the scratch for genuine analog switches that have a degree of built in protection datashheet adding some external protection around that. Board Setup and Configuration.
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For current source, i have added 8 of these, each giving 1mA as per Bimpelrekkie. Home Questions Tags Users Unanswered. I have also included a resistance 2. I datasbeet guessing this should work: 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.
However the high on resistance will still prevent you from reaching the required accuracy. Sources for Electronic Parts.
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.
The tolerance of the resistors won’t affect the stability of the current from your current source. One can look at the schematic and explanations here.
Sign up using Facebook. But you can read and write to the pins quite fast. Needed accuracy must be better than 1degC and range from degC. This is so because 1mA is passing through the 1st MUX. In general how much current variation can i expect? The on resistance will vary over almost anything like supply voltage and temperature. Email Required, but never shown. Thanks a lot for responding so far.
Also i did not yet think about protections to the inputs of the board, a very valid point. I already thank Bimpelrekkie and Spehro Pefhany for helping in such short period.
Please correct me if i’m wrong in this. I guess i will have to go with the better versions of for now. Post as a guest Name.
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The multiplexers would then be switched to the same input at the same time. Since i need to make a differential measurement between the first two leads of the pt while avoiding rds on of HC, i attached A0 of the ADC directly to the first wire through a schottky diode.
No, that is not a problem as long as the current source is working properly. Sign up or log in Sign up using Google. The remaining circuit consists of routing each of this 1mA to each pt For more info pleae look at this Forum Post. Related Hardware and Initiatives. It may affect the actual current. If some other idea could be evolved, it would be great!
For more info pleae look at this Forum Post. The sink of all currents is through a resistor, which i suppose will help in making a noise free measurement. There is no delay needed between selecting and read or writing the pin. I am a novice mechanical eng. I could order online but it would take weeks and cost a lot import duties to india.
But you can read and write to the pins quite fast. Using mux on middle wire of PT and differential measurement of A0 and A1 gives lead wire resistance. You mean once the resistor if soldered fixed, the current from a particular circuit will be stable over time and temperatures?
I worked on Bimpelrekkie ‘s as well as Spehro Pefhany’s answers. Sources for Electronic Parts.