LM86EVAL Schematic and Gerber Files

Hello David,

I apologize for the delay. I will track down these files for you.

Best regards,

Ian Williams
Linear Applications Engineer
Precision Linear and Sensing Products 

Hi David,

The LM86 is a eval board is very old and has a discontinued controller on it. I was wondering why you needed the files. I just want to make sure I can provide you what you need an not waste your time.

Take care,

Emmy Denton

Precission Systems

Precission Signal Path

Silicon Valley Analog

Texas Instruments

Hi David,

Are you still in need of the gerber files? Please keep in mind that this is a very old board with a disconued controller on it.

Thanks,

Emmy Denton

Precision Systems Applicaitons

Silicon Valley Analog, Texas Instruments

Hi Emmy,

No, that is not necessary. However, I'm still having problems with the device. Any chance you can help me troubleshoot the problem? I am using an external diode connected transistor as my source. The communciation to the device appears to be normal. Actually I have a good and stable communication with LM86 @  0x4C address. The internal temperature sensor reads out correct values. Again, the problem is with the external configuration; that is, with reading a correct temperature using the external transistor only. Perhaps you could suggest a working solution that uses an externaly connected transistor? Maybe our software is not configuring the device correctly. Our hardware layout has been reviwed by the factory, but there was no information regarding the software. Any information you can provide to help me would be greatly appreciated.

-David

Hi David,

What is the failure signature. It's hard to diagnose something without any specifics. If you are having issues with noise then routing or power supply decoupling can be the problem. Noise can also appear as a huge offset on the output reading (usually positive). Missplacement of the diode can also give errors in the temperature reading. Remember the temperatrure you will be measuring is very close to what is applied to the diode pins. Software should not  be an issue for this part (unless the 2's comlement format was coded incorrectly, or the offset register was set incorrectly). The LM86 should work well with the 3904 type of transistor it also works well with a 3906. Make sure you diode connect the transistor (that is tie the base back to the collector), some folks have tried to use just the base emitter junction but that won't work well.

I can give you more advice if I can get more details. I hope this solves your problem.

Take care,

Emmy Denton

Precision Systems Applications

Silicon Valley Analog (formerly National Semiconductor)

Texas Instruments