What is IC 7106
Found for icl7106 datasheet english - To the electronics forum
2 - Understanding / building your own Autosense voltmeter - Understanding / building your own Autosense voltmeter
Quote: 9M + 900k + 90k + 10k
In between, I pick up the voltages, which is how you do it with manual range switching.
With the autoranging instruments there are no isolated switches for the high voltages and therefore MOSFETs are only used to add load resistors parallel to the ADC input.
Quote: I could connect a rectifier upstream, but it also eats 1.4V (bridge rectifier). Take a look at the applications of operational amplifiers to see how you can use them to build an ideal rectifier!
P.P.S: The DMMs do not use ADCs which, like your µC, are based on the SAR principle, but usually dual slope converters.
The ancestor of it is ICL7106 and in that data sheet (if it's from National Semiconductor (!)) will be exactly ...
3 - LCD display without data sheets - LCD display without data sheets
The two in the first row are bare 7-segment displays, e.g. from the ICL7106 or a clock module, while those in the lower row have a controller on the board and thus identify themselves as matrix displays.
This means that they are at least able to display alphanumeric characters in a 5x7 dot matrix, but they are probably not capable of graphics.
For example, it is common to display 4 lines of 16 characters each.
The built-in controller is probably the HD47780, which is very common in such dissplays, or a compatible one, but the biggest difficulty for you could be figuring out the pin assignment of the display without ruining the IC.
But maybe you will find that data sheet of the display when you search for the type designation. ...
In my studies I have a subject called circuit development.
I am supposed to develop a temperature measurement for this. The default was a PT100, a ICL7106 and an LCD display.
The circuit diagram is attached below.
And now to my problem:
The LCD shows me permanently a 1. I have already been told that this is supposed to be an overdrive of the AD converter. However, I don't know where that should come from. my measurement signal is around 20mV. The reference voltage is 100mV because I want to use the measuring range of 200mV. My LCD works with the control via the test PIN and shows -1888. Otherwise the wiring of the ICL7106 as in Figure 1 in the following data sheet:
The only thing I can't really explain to myself is that the INT PIN only has a noise in the µV range and nothing like it data sheet on page 5 is present.
Otherwise I can only say that I used multilayer capacitors instead of film capacitors, as I unfortunately only found out afterwards.
So I ...
some questions from quite a noob who has been trying to teach himself how to solder for a while. I didn't get any further with the search function - maybe you will look up the beginner questions and give me a brief advice.
Background: I would like the LCD thermometer kit ("Kreis 1") from C ***** (3 1/2 digit LC display + ICL7106, Item no .: 115452-62) can be combined with the measurement of a second size. To do this I would like a second ICL7106 switch in parallel to the LCD and switch the voltage supply of the respective "measuring circuit" on or off with a changeover switch.
The second measuring circuit ("Circuit 2") is a current measurement, which probably outputs a pulsating DC voltage. With my cheap multimeter it seems to work halfway (can drive it up to approx. 500uA via a potentiometer):
This originates from Intersil and is called ICL7106 if it should be LCD, the LED variant is called ICL7107. It is precisely carved for the application and ideally suited to it, you only need the appropriate sensor (the diode is certainly not that bad). The fact that he cannot measure against his own supply minus does not matter here, because he does not have to! The sensor (diode, resistor, ...) is potential-free! Otherwise you choose the LED variants, it can!
A few external components and you have success without having to grapple with the programming language, development environment and the unsolvable problem of program creation for a layperson. The effort with a microcontroller is, just to create a program and program the thing 10 times as big, if the program also does THAT ...
7 - IN LO at ICL7106 pull to V-? - Pull IN LO at ICL7106 to V-?
I have a DMM (with 9V supply) and an LM35 here. I want to build a thermometer out of both.
But now I have the problem that there is only about 3V between IN LO (= ground measuring voltage) and V +, so far too little for the LM35. I could of course also hang the GND of the LM35 on V-, but I would have to use tricks again to get 20 displayed at e.g. 20 ° C.
Does anyone know if there are problems if I hang IN LO on V-?
(Do I then have to cut the connection between IN LO and REF LO?)
Thanks in advance!
data sheetICL7106: http://www.ic-lösungen.de/cms/cms.php/366.html
[This message was edited by: ElektroNicki on Feb 1, 2009 15:58] ...
First of all about the project:
I want my power supply unit to have two digital displays. I decided on the LCD / IC combination from Conrad with the ICL7106.
Since I want to use one display for the voltage 00.0 ... 25.0V and the other for the current 0.00 ... 3.00A, 3 digits should be enough without using the leading 1. But I didn't get that far ...
To keep the size small, I inserted a circuit board with the (two) LCDs and a circuit board with two identical circuit layouts as shown in the picture (data sheet of ICL7106 2V entrance area) designed and implemented. The power supply and GND as well as analogCommon are separated to anticipate it.
Since one circuit could not be completed at the same time without a further 25 K potentiometer, I made my first tests only with a single circuit outside the power supply unit without any input voltage.
The result: at 10 V operating voltage and short-circuited input display: -1888
My attempts to calibrate to 1 V on Ref Hi -> Ref Lo worked fine, but did not change anything on the display.
By measuring, I established ...
The easiest way to avoid these problems is to use a separate supply for the entire measuring circuit, which is galvanically separated from the voltage source to be measured.
With a little more planning, however, it is usually sufficient to generate a negative auxiliary voltage that only has to do very little.
[This message was edited by: perl on Mar 15, 2008 3:40 am] ...
10 - mechanical pressure measurement - mechanical pressure measurement
I'm new here and hope to find some suggestions from those interested.
I have to design a readout device for a relatively high-quality pressure sensor that measures pressure loads in a horizontal plane.
The pressure sensor works as a resistance full bridge and, according to the manufacturer, outputs a linear output voltage for the respective measured pressure. It is operated via 10V =. The output signal is estimated to be (data sheet not yet fully received) within 10 to 100 mV =. Not a big problem in and of itself about a differential amplifier. However, the accuracy class of 1% should not be exceeded - in the best case more than 0.5%. The sensor is designed for mechanical loads between 0 and 10kN, i.e. 1t.
I thought about using a good differential amplifier (AD623 ??) and a voltage measuring LCD display as the basic building blocks. I can go that far. Then calibrate the gain using a rotary resistor so that the voltage can be read off directly in Newtons.
I am unsure about the following things and hope for suggestions:
The signal must be temperature-independent, i.e. the output value of the measuring head must be recalibrated in an unloaded state for each measurement.
Quote: I still have such LED displays from a cannibalized device. Then first check whether these are types with a common anode, as you need them here.
This is because segment displays with a common cathode are also common.
Quote: I'm not quite sure whether I am at the front of the circuit where the voltage from the power supply is connected (where IN is), a voltage divider or something like that is needed, or whether the voltage is connected directly. If someone else could tell me that, it would be great. As I said: All of this and much more is in the data sheet
Quote: I would also have an LCD display ...
Quote: Your lab power supply seems to be the most luxurious of them all. For me - to be honest - a bit too expensive, well, as I said, if you omit the whole swing around the LM358, which manages the temperature limit, then it actually hits the same notch as the ELO power supply.
Many parts are completely the same anyway, such as the voltage reference circuit to the error amplifier and the power supply for the OPV is basically the same, only that I have added a current amplifier transistor.
When measuring the current, I saved the extra shunt thanks to the little trick (which also has its pitfalls). But in total I can get by with 1 LM324 and have a voltage at U13 that corresponds to the output current, which can be easily tapped.
The LED panel meter for display can be found ...
Most of these panel meters are fairly exact replicas of the circuit example in the data sheet of ICL7106.
So check, if necessary with the ohmmeter, where Pin1 (+) and Pin26 (-) of the IC end up (with the normal DIL housing - there are also mirror-inverted R versions), connect a 9V battery, then something should be seen be.
You then have to determine the rest yourself using the components and the data sheet.
The small Philips chip in the picture, I can't see the type, probably a 74xx86 or other XOR, should only be responsible for controlling the decimal point. The actual DVM chip, with its 40 or 44 connections, is located elsewhere.
[This message was edited by: perl on Nov 12, 2007 1:28 PM] ...
-0 useful parties that you feel like going for
-1 Mechanically defective cheap multimeter
-1 soldering needle
-1 Dremel with cutting disc
-Solder 0.5mm as required
-34AWG threading wire
-1 decent LCD (not from the multimeter here)
-1 data sheetICL7106
-1 piece of strip grid plate
-Workshop odds and ends
The "pinout" around the epoxy blob corresponds exactly to the MQFP version (and the pad sequence on the die loudly data sheet). Here you have to do with about 0.75mm pad spacing!
The ICL7106 could be distinguished from the ICL7126 on the basis of the component values used.
To reuse the multimeter LCD (zebra rubber type) would of course have been attractive ... but the contact on the glass is almost invisible, and you would have had to do a lot of tinkering and, above all, align it very precisely. ...
Quote: sealed off from outside light instead of in a kind of tube. So that no extraneous light can enter. Needless to say.
Quote: We want the whole thing now based on the voltage change within the circuit of the photoresistor: I would not recommend it.
As already said, photoresistors are not particularly linear and stable.
In addition, the intensity of the LED light is temperature and age-dependent.
I suggest using two Si photodiodes, one before and one after the measuring cuvette.
With the first one measures the intensity of the LED and with the second the intensity of the light weakened by the solution and then forms the quotient.
This is particularly easy with a standard DVM chip like that ICL7106which can also be found in 5 Euro digital multimeters.
This chip has ...
It will produce results in the same way, only the accuracy will suffer a little. The whole circuit then has to resolve a voltage ten times smaller. Then any noise and whatever else influences the result will have a correspondingly greater effect.
As PhyMalLehrer already says, just give it a try.
data sheet you can find the module here: Link
The topic of reference voltage is also dealt with there.
Even if it fits the occasion, something less dangerous would be better.
Maybe a digital room thermometer. A 3.5 digit LCD, one ICL7106, the data sheet In addition, there is also the right circuit on it and off you go.
Doesn't eat a lot and sounds pretty nice!
Simple and reliable, without any holes in the roof.
We had even uploaded German-language versions here. Use the search function! ...
I'm also looking for something like that. And while I'm looking, I stumble I have an IC. It can measure the temperature and pass it on to a display.
The IC is called: ICL7106/7107
You can find it at http://www.Conrad.de for around 10 € with the display.
in the data sheet is the exact structure inside. (Page 11)
I hope I could help you.
[This message was modified from: Rambodian on Jan 16, 2005 5:17] ...
.... with direct current there is a possibility to galvanically separate it. With alternating current you use an isolating transformer, but with direct current it doesn't work .....
Unfortunately, that's the way it is.
The common DC-DC converters first chop the direct current, send the resulting alternating current through a transformer and then rectify it again.
For small services you can buy something, cannibalize it or even build it yourself.
Under certain circumstances, however, you don't need galvanic isolation for the DVM modules, just an auxiliary voltage. If the ICL7106 or ~ 7 is built in, maybe you should data sheet and study the corresponding application notes.
You're talking about the LED compatible ICL7107 but post a circuit diagram of the LCD compatible one above ICL7106.
There are a few worlds in between.
And as sorry as I am, but that data sheet from Perl, the basic circuitry of the ICL7107 can only be deciphered with a lot of imagination. But it doesn't matter anyway. I know this wipe, which was hawked by Völkner at the time, and thought it would help me when I dealt with the ICL7106/ 07, but unfortunately it did not help me the least to get problems under control. The leaf of Perl focuses too much on that ICL7106 - The ICL7107 has its own problems, which arise, among other things, from the multipexing of the current-consuming LEDs and the self-heating of the chip.
The only thing that helps is to draw an application note for this particular chip and follow an existing PCB layout.
Also scour the network for kits to get an idea for a flawless PCB layout for this LED driving ICL7107.
Here is an original version of Perl leaves so that you can read the circuit diagram ...
So I took the liberty of doing an old data sheet of the company Völkner, afaik now at Conrad Electronic, to be scanned and uploaded here.
In my opinion, this is a mixture of different documents from Intersil, whose German distributor, Spezial Electronic KG in Bückeburg, translated these documents into German in the 1970s.
Have fun and success with it!
alpha-ranger has just drawn my attention to the fact that the data sheet there is a writing error on the first page in the connection arrangement.
Pin19 is incorrectly designated as AB (1000), correctly it must read BC (1000).
Please take this into account so that the left "1" is displayed correctly.
The above post is my private opinion.
Legal claims can not be derived from their use.
Especially VDE0100; VDE0550 / 0551; VDE0700; VDE0711; Observe VDE0860!
[This message was edited by: perl on Feb 24, 2004 23: 4 ...
Without precise information about the type of panel meter, the only thing that helps is digging out the crystal ball ...
Apart from that: think about how you want to get rid of the malfunctions caused by ignition, LIMA, fans etc. Without this, monitoring the on-board voltage becomes a number-guessing game - unless you go directly to the battery poles with extra test leads - there are still very few faults to be expected.
I'll quote from you
Quote: LCD displays are ... activated by applying an alternating voltage to the backplane and the respective segment. If the segment is deleted, the voltages on the backplane (hereinafter abbreviated to BP) and the segment are in phase. If, on the other hand, it is active, the voltages are phase shifted by 180 ° but NOT constant. - i.e. sometimes the segment is positive compared to the BP, then negative again.
For a more detailed understanding, one can look at the control of the decimal point in LCD displays on a digital multimeter board (with the ICL7106 and consorts). This is often implemented discreetly and if it has to be switchable (electronic range selection if necessary) this is implemented by ...
Probably this is OT again and completely over the topic, but has anyone ever realized that this simply cannot work because of the different control of LED and LCD?
LEDs are excited by a current flow in a direction dependent on their polarity (with reference to the multiplex process as Benedikt described),
Unfortunately, LCD displays are activated by applying an alternating voltage to the backplane and the respective segment. If the segment is deleted, the voltages on the backplane (hereinafter abbreviated to BP) and the segment are in phase. If, on the other hand, it is active, the voltages are phase shifted by 180 ° but NOT constant. - i.e. sometimes the segment is positive compared to the BP, then negative again.
For a more detailed understanding, one can look at the control of the decimal point in LCD displays on a digital multimeter board (with the ICL7106 and consorts). This is often implemented discretely and if it has to be switchable (electronic range selection if necessary!) This is implemented by routing the signal from the backplane via a CD4070 EX-OR and its output to the relevant decimal point. If you now keep the second input of the Ex-Or on '0' that is ...
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