Timeline for Applied 370degC at the input of an ADC in a Microcontroller
Current License: CC BY-SA 4.0
15 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| May 23, 2020 at 4:49 | vote | accept | CommunityBot | ||
| May 22, 2020 at 16:57 | comment | added | Andy aka | You can't assume that the damage hasn't caused neighboring parts of the silicon to also become damaged. Excess current could be due to the old CMOS ESD-latch-up problem (worth googling) or just a general degradation of components around the area where the event hit. You probably won't be able to use the pin's alternate functionality but there's nothing wrong in trying it. However, I'd just take the chip and throw it in the trash and fit a new one. | |
| May 22, 2020 at 15:40 | comment | added | user220456 | Ok. Suppose if that ADC pin only is damaged, why is there an increase in current if its damaged? And apart from that pin, can I use the micro for properly functionality if I remove the ADC functionality itself (I am not planning to remove, just asking for understanding purpose)? | |
| May 22, 2020 at 11:49 | comment | added | Andy aka | No, I'm not going down the ESD explanation here - if you want to know how ESD damages a pin, raise a new question. Excess heat will damage anything eventually but my considered viewpoint is that this is an ESD event. | |
| May 22, 2020 at 11:46 | comment | added | user220456 | doesn't excess heat damage the internal circuitry of the Microcontroller pins? Could you please explain the process how ESD damaged in simple terms | |
| May 22, 2020 at 11:09 | comment | added | Andy aka | Both devices could in fact be damaged if the ADC pin was also connected to another chip. Replace the microcontroller is my advice. Then if the other chip is not playing ball, replace it too. | |
| May 22, 2020 at 11:06 | comment | added | user220456 | And yes, I trust the answers you and others have been providing for my questions. Its just that my level of understand is way beneath your levels. So, understanding takes time. And when you provide an answer,I go through it more than once to understand how you have deduced the defect/fault/failure. It is also very important for me to understand how you are deducing the things which will help me in the long run | |
| May 22, 2020 at 11:04 | comment | added | user220456 | Actually the ADC pin connected to the SENSE pin of the MOSFET which I have shared the datasheet in the previous comments. I took a wire from the ADC micro-pin. The wire is directly connected to the pin. And doesn't excess heat damage the internal circuitry of the Microcontroller pins? | |
| May 22, 2020 at 11:00 | comment | added | Andy aka | You said this: I took a thin 45cm copper wire from that pin and started to measure - now what does that mean? Does it mean that the ADC pin is electrically isolated from that wire? Or does it mean that it is connected to that wire? | |
| May 22, 2020 at 10:59 | comment | added | Andy aka | I said that "It's likely that an ESD event occurred". I said this because this is a common thing to happen in the scenario you described. Nobody can be sure and give you a definite answer on this; you have to trust experienced people and, in the absence of other evidence of what caused that failure, you would likely conclude that it is ESD. | |
| May 22, 2020 at 10:57 | comment | added | user220456 | Yes, the circuit is unearthed. But the soldering station is earthed. How did I earth the single pin when I touched the soldering iron? Not able to get clarity on this. Please help | |
| May 22, 2020 at 10:55 | comment | added | user220456 | ok. But actually, I am still not able to understand how you found that it is an ESD event? I actually thought that the heat may have caused the internal capacitor and diodes circuit to fail. Could you please explain a little more on how it is an ESD event | |
| May 22, 2020 at 10:52 | comment | added | Andy aka | Replace the microcontroller is my advice. | |
| May 22, 2020 at 10:51 | comment | added | user220456 | So, the Microcontroller is to be replaced for proper operation? The other of the ADC pin is connected to this IC - st.com/resource/en/datasheet/vn7140aj.pdf - pin 4 ? Will this IC also get damaged due to this? | |
| May 22, 2020 at 10:45 | history | answered | Andy aka | CC BY-SA 4.0 |