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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Using mux on middle wire of PT and differential measurement of Dtaasheet and A1 gives lead wire resistance. If i simplify the requirement to 3-wire PT, will it help? The Texas Instruments datasheet of the CD isn’t very clear about the maximum current.
In any case, CD voltage drop is excessive at much over 1mA. What is possible is to use a current source for each sensor and then only multiplexing the resulting voltage to the ADC input. I guess i will have to go with the better versions of for now. 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.
Arduino on other Chips. But i could never find how they practically implemented this or if its performance suffered and so on.
CD Datasheet(PDF) – TI store
I could order online but it would take weeks and cost a lot import duties to india. If you use the as a Demultiplexer you can choose between 8 different outputs and select just one you want to write at the time.
Related Hardware and Initiatives. So the current may not be that constant.
The sink of all currents is through a resistor, which i suppose will help in making a noise free measurement. Sign up or log in Sign up using Google. Instead i though i could make a differential measurement of voltage drop across the first two leads of the PT using A0 and A1 to get lead resistance.
There is no such limit on switch current- 1uA is leakage. For more info pleae look at datashheet Forum Post.
If you have an ideal current source of 1 mA in series with a resistor, what will the current be? See comment above with idea to replace 8 current sources by one current source and one 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. Since i need to make a differential measurement between the first two leads of the pt while avoiding rds datashret of HC, i attached A0 of the ADC directly to the first wire through a schottky diode.
For more info pleae look at this Forum Post. You can choose between 8 different inputs and select just one you want to read at the time. I will hand pick the resistors but what about temperature compensation? Datashest my problems are: Since no current is flowing, the resistance of mux is not an issue here. Sign up using Email and Password. Here is the plan: However the high on resistance will still prevent you from dataxheet the required accuracy.
Kindly let me know if there are any mistakes or improvements in the above scheme. Since it appears that the can support the 1mA what you could do to avoid Ron influencing the measurement is using separate multiplexers, one to multiplex the current feed it to a sensor the other to sense the voltage.
If you really want to measure ‘top’ lead resistance for some reason other than break protection for which A0 suffices you can add another analog multiplexer and pick off the voltage at the ‘top’ of the RTD.
The on resistance will vary over almost anything like supply voltage and temperature.
A multiplexer or demultiplexer enables you to expand the in-and outputs on your Arduino board. Finally i didnt go with the above but a modification using Bimpelrekkie ‘s suggesstions.
In my edit, i made a mistake. In this figure, the first wire of pt is supplied by 1mA current through a HC see footnote. Needed accuracy must be better than 1degC and range from degC.
An HC xd4051 be better at 5V.
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Can i use transistors as switchs to route the 1ma instead of CD? For current source, i have added 8 of these, each giving 1mA as per Bimpelrekkie.
Spehro Pefhany k 4 I am only now interested in 3-wire PT sensors as these are what available locally at affordable prices. I am a novice mechanical eng. The current will always be 1 mA whatever value the resistor has.