AnsweredAssumed Answered

RTC battery run out after several months

Question asked by Bui Phuoc on Aug 3, 2017
Latest reply on Aug 28, 2017 by Bui Phuoc

Hello NXP,

I am using NXP LPC4078, the RTC module is onchip. To maintain the RTC, I use a CR1620 battery from Panasonic.

In theory, the battery can maintain real time over than 5 years. However, some of my product just run out of battery (measured voltage 0 volt) after around 4 months. Currently, we detected 2 of 500 products that happen the problem.

The circuit design is as below:

with VBAT is connected directly to pin 19 of the LPC4078 100 pin.

I don't known that problem caused by the battery or by hardware. Are there any body met that problem? Please give me any idea to solved it.

Thanks in advance,