Difference between PCF8563TS/4 & PCF8563TS/5

[JoeChen]

We are using a PCF8563TS/5 on IMX8MMINI board, and everything works well on it.

Since PCF8563TS/5 is out of stock, we decided to use PCF8563TS/4 instead, but after we've tested it, we found that PCF8563TS/4 is not working, and we found that when the Linux Kernel is checking the function of PCF8563TS/4, it shows: low voltage detected, date/time is not reliable.

In order to resolve this problem, we have to run "hwclock -w" to reset it, and the RTC works, but after some days, the time has been reset (We are sure that the battery on the board is working). 

Please help to check if we have made anything wrong.

Thank you.

[JozefKozon]

Dear Joe Chen,

the PCF8563TS/4 & PCF8563TS/5 are fully drop-in and software compatible. Please find a file attached. The only difference is in the ESD properties. The older TS/4 version has slightly worse CDM properties.

Could you please confirm, that you have both the PCF8563 components from one of our authorized distributors? Please see this link for a list of our authorized distributors.

With Best Regards,

Jozef