We use STM6600CS25DM6F in our application. The Li-on battery is also used in the circuit. When we dis-connected the USB cable, the battery voltage was dropped from 4.3V to 3.6V for 0.3ms. The system power consumption is around 0.3A. This suddent drop seemed to trigger STM6600 to start a protection. Then the PWR_EN was output "Low" and the system power was off.
We review STM6600 datasheet. It seems 3.6V should not cause under-voltage protection. We aslo checked the VCClo and INT signals. There is no abormal condition detected. Is there any suggestion to slove this problem? Thanks for your help.
