The chip does not work when powered on

cxq742536574

The chip does not work when powered on [Copy link]

When the board is plugged in or out while it is powered on, the chip enters an unknown state, which is neither sleep mode nor normal working mode. It cannot work at all. It returns to normal after powering on again or resetting the hardware.

dcexpert

Looks like a power or power-on reset problem

qwqwqw2088

Refer to the chip manual to check whether all the voltages of the chip power supply meet the requirements.

littleshrimp

I also think it may be as mentioned on the second floor, the possibility of abnormal reset is relatively high.

cxq742536574

qwqwqw2088 posted on 2022-2-22 22:03 Check the chip manual to see if all the voltages of the chip related to power supply meet the requirements

There may be impact during the plugging and unplugging process, but it cannot be restored after stabilization, and power must be turned on again. Moreover, the defective rate of the problem is not high, and it is not easy to occur on the same board. Is there any better troubleshooting method?

led2015

Start measuring from the initial access point to see if the operating point voltage is correct.

qwqwqw2088

cxq742536574 posted on 2022-2-23 10:16 There may be impact during the plug-in and unplug process, but it cannot be restored after stabilization. It must be powered on again, and the defective rate of the problem is not high. The same board...

If hot plugging is required, are hot plugging measures considered in the power circuit?

The most common interface hot-swap is USB hot-swap

cxq742536574

qwqwqw2088 posted on 2022-2-23 13:17 If live plugging is required, does the power circuit take into account hot-plugging measures? The most common interface hot-plugging is USB hot-plugging

In actual use, there is no need to plug or unplug the power supply. This is just a problem encountered during the test process. Now there is a problem that even pulling the hardware reset pin directly cannot restore it. This is more serious.