LDC1314: LDC 1314 under the sun

dendama-san

Prodigy 120 points

Part Number: LDC1314

LDC1314 is used at out mass production as below link, in order to sense copper ball approaching.

https://dendama.co.jp/gummy.html

Under the sun, the output of LDC 1314 is stopped. Are there any issue, when the sun lights LDC1314 IC?

over 4 years ago

0 Clancy Soehren over 4 years ago

TI__Mastermind 23810 points

What do you mean by "stopped"? Is the output code saturated? Or is the device not responding at all?

We do not know of any issues where the LDC1314 will simply stop working. It is possible that the temperature change is causing an output code saturation, but that should be easy to see if you sweep your sensor over temperature.

0 Kristin Jones93 over 4 years ago

TI__Genius 17440 points

Hello Dendama-san,

The LDC1314 could be overheating if it is operating at temperatures greater than 125 degrees Celsius (the maximum operating temperature listed in the datasheet). Are you able to measure the temperature when the output stops?

Best Regards,

0 Chris Oberhauser over 4 years ago in reply to Kristin Jones93

Prodigy 80 points

Hello Dendama-san,

A useful LDC debugging technique is to get an oscilloscope and look at the sensor signals and check the frequency and voltage. Perhaps the sensor was not configured properly for the range of Rp.

Regards,

ChrisO

0 dendama-san over 4 years ago in reply to Clancy Soehren

Prodigy 120 points

Under the sun, the device is not responding at all for a few seconds. Once the device goes back to the place where is non sun light, the device is responding again. But, in this case, the output value is something wrong.

0 dendama-san over 4 years ago in reply to Kristin Jones93

Prodigy 120 points

I don't think overheating cause this effect, because rapid temperature change doesn't cause this effect with Hairdryer or refrigerator.
When stopping output effect happened, the temperature was 25. What is more, the other device and the other day, this effect always happen under the sun.

0 dendama-san over 4 years ago in reply to Chris Oberhauser

Prodigy 120 points

Ok, we will check with the oscilloscope. which pin do we need to check with oscilloscope?

0 Chris Oberhauser over 4 years ago in reply to dendama-san

Prodigy 80 points

Look at either the INAx or INBx (where x is the channel number the sensor is attached to). You can either look at INAx to ground or INBx to ground; or if you have a differential probe, you can look INAx - INBx.

Sensors

Sensors forum

LDC1314: LDC 1314 under the sun