Tool/software:
Hi All,
A defect occurred in the MPU of 1 product after mass production.
・The current consumption of the 1.0 V power supply is high and the heat is high.
Normal MPU: Approx. 5 mA/°C
Problem MPU: Approx. 20 mA/°C
・When a problem occurs, CPU autonomous reset and restart are repeated.
・Ambient temperature In an environment of 50°C, the surface temperature
becomes approx. 90~96°C, which is 15~20°C higher than that of a normal MPU.
・There is no problem with current consumption other than the 1.0 V power supply.
・A cross-check was performed, and the problem was reproduced.
->It was confirmed that there was a problem with the MPU.
・The same problem occurred 3 times in 2024.
Lot number of the problem in 2024: 18P0HEQ
Lot number of the problem in 2025: 18P0ECQ
[Question]
・Has this kind of problem ever occurred?
・Has errata or other measures been taken?
・Please give us your opinion on the cause and countermeasures.
Best Regards,
Ito
