LMP datasheet, LMP pdf, LMP data sheet, datasheet, data sheet, pdf, BayLinear, Low power low offset voltage dual comparator. LMP Low Power, Low Offset Voltage, Dual. Description. The LM consists of two independent precision voltage comparators with an offset voltage. LMP ti LM, Dual, General Purpose Differential Comparator. These devices consist of two independent voltage comparators that are designed to operate.

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By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. I have two inputs for my LMP comparator https: I have 5v from the Arduino running to Vcc of the comparator and the ground of the comparator running to the Arduino ground. I am using input 1 of the comparator, having checked that I am using the correct input and output ports.

The output port is connected to the Digital port 10 of the Arduino set to “input” with a 1k resistor in between. One thing I am concerned about, is that the marking on the comparator isn’t the same as in the datasheet. The comparator does note it is the LMP however, but I might have mistaken which side was “up”.

I believe it to be the side of the small circular indentation now.

The readings almost always return 1, but periodically return 0. Having the comparator been placed in reverse, should I expect it to be broken or is there possibly another cause to my problem? I’m not sure of a website or application in which I can draw schematics easily, as I am a beginner to electronics, but I’m willing to sketch a schematic if that’s of use.

Just ordered some extra LM’s. I will keep this question open and check whether a new IC will fix the problem. Made some new observations. I’ve got the LMN’s in the mail, and they show the same scenario. If I connect a led to the output, I see a faint light with a Ohm resistor, while the same led on 5V input shows full brightness.


I would expect the led to change in brightness. Is it required to use all the ports on the comparator for it to work? To add some info, originally I was using photodiodes to compare the outputs of two of them and send the result to the Arduino. I got the comparator working! I accidentally mistook delay for being seconds, but it is instead milliseconds.

Writing with the digital ports, high and low, alternated by a second, I got the comparator to play nice. I placed a 1K resistor between Vcc and output. Now to get it to work with my photodiodes. If your Arduino is reading both states, 0 and 1, your comparator may be OK. The problem is your inputs.

Instead, try a circuit like this. If you enable the internal pull-up in the Arduino it should work as that will pull the signal high when the LM is not conducting. The 1K resistor is not necessary and you could datasyeet it directly to the Arduino but it shouldn’t hurt operation either so you can leave it there. Datawheet can’t see the pin 1 marker in the photo but you are right in that is often a small dimple next to pin 1. By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

Home Questions Tags Users Unanswered. Did my comparator break? Update Just ordered some extra LM’s. Update Made some new observations. Update I’ve tried replacing some datashret the connections to no avail. Update I got the comparator working! Update It now works with my photodiodes, but the accuracy and responsiveness are very low. Why is the other device floating? Left side of the breadboard was used for another version.

I guess that’s what you’re saying, I forgot to mention that. If you’re talking about the other side of the comparator, I’m just using one side at the moment.

Do you only have the one LMP? If you connected it and powered it thinking pin 5 was pin lm39p3 then adtasheet very well could have killed it. If you have another one, double check your connections and input voltages, and drop it in.


Okay, thanks for your input. I will order some extra indeed, unfortunately I only have the one at hand. I see that in the picture it is actually the wrong way around probably too.

The circle in the left bottom corner of the chip should be on the right, I take it? The other comparator should be configured so that the output is high-impedance.

Instead, try a circuit like this simulate this circuit — Schematic created using CircuitLab. WhatRoughBeast 49k 2 28 The LM can accept inputs down to the negative rail and a bit beyond. KevinWhite – Sure, but that’s not the point. This way dataeheet well-defined input levels, and the operation of the comparator is clearly defined. lm933p

LM393P Datasheet Download

In the OP, there was no specification of exactly what the levels were, and for all one knows the inputs were so close together that the comparator was responding to thermal drifts.

I’ve tried wiring up the digital ports to the input pins of the comparator, but that shows no decent results. Putting a 1K resistor between Vcc and output did the trick. The LM is an open collector device and will only pull down.

Setting the internal pull up did not work unfortunately. I figure it must be that the IC is damaged. Update; IC isn’t damaged. I ordered new ones and the same results apply. I’ve added a bit to the original post.


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