I would like to design good products, however, nowadays, products are need to be interfaced or integrated to others. For example, you design a mobile phone market the mobile. However, most often, you do not design the charger, you OEM or you simple let the client buy the charger. My products is like that, I cannot provide the power supply as the client provides that. I cannot control where my client install the equipment. My experience, when they installed in peak, lightning surge always damage the products.
So, I simple thank a chip that features watch dog and monitor the power is the easy way. At the end, does anyone have idea on a chip have that function : AT89C55WD + CL1232
Regards
Alex