LPC1778FBD144 communication abnormality

[zhaoninggu]

Hello, the LPC1778FBD144 is used in our company's communication module products. Recently, during the 60-degree aging test, we discovered that some of the communication modules exhibited the following issues: when the temperature exceeded 60 degrees, the indicator light of the communication module chip would stop blinking, resulting in abnormal communication. However, when the temperature cooled down to around 50 degrees, everything returned to normal. Upon replacing the LPC1778FBD144 chip, the module communication resumed normal operation. Interestingly, when the problematic chip was removed and soldered onto a normal module for testing, similar abnormalities were observed. What are the common causes of such occurrences?

[Harry_Zhang]

Hi @zhaoninggu 

Based on the phenomenon you mentioned, it is indeed very likely that it is a problem with the clock, as the crystal oscillator is affected by temperature.

So I suggest you try a different external clock.

This problem may also be caused by the following reasons:,

Temperature sensitive characteristics: Microcontrollers or certain internal components may be more sensitive to temperature. When the temperature exceeds a certain threshold, it may cause changes in the internal circuit characteristics of the chip, affecting its normal operation.
Power supply issue: High temperatures may cause unstable power supply or a decrease in the performance of power management circuits, thereby affecting the power supply of the chip.
Solder joint issue: In high-temperature environments, the reliability of solder joints may be reduced, leading to problems with the connection between the chip and the circuit board.
Packaging heat dissipation issue: The packaging of the chip may not be sufficient to effectively dissipate heat at high temperatures, resulting in high internal temperatures that affect its normal operation.

I hope it can help you.

BR

Hang