topic Re: Can we use coin cell battery backup for 8563t rtc? in Other NXP Products

Can we use coin cell battery backup for 8563t rtc?

dhanash — Fri, 13 Apr 2018 10:03:42 GMT

Hi i am using 8563t rtc with rechargeable battery. Now i want to move 3V CR2032 coin cell battery,what will be the operating hours?

Re: Can we use coin cell battery backup for 8563t rtc?

guoweisun — Mon, 16 Apr 2018 02:25:20 GMT

Hi,

Yes,you can use coin cell battery backup PCF8563T.

Thanks!

Re: Can we use coin cell battery backup for 8563t rtc?

dhanash — Mon, 16 Apr 2018 10:52:19 GMT

i need a circuit diagram for 8563T should work main power and it should work battery backup(coin cell 3V CR2032) when main power is not available.

thanks

Re: Can we use coin cell battery backup for 8563t rtc?

guoweisun — Tue, 17 Apr 2018 11:23:39 GMT

Please download UM10301 as below link and refer to page31 figure12.

https://www.nxp.com/docs/en/user-guide/UM10301.pdf?fsrch=1&sr=1&pageNum=1

Re: Can we use coin cell battery backup for 8563t rtc?

dhanash — Wed, 18 Apr 2018 09:56:39 GMT

i have seen pdf and How to select Diodes (D1,D2) and R1 resistor value? while i am using primary lithium cell for backup circuit.

Thanks

Re: Can we use coin cell battery backup for 8563t rtc?

dhanash — Sat, 21 Apr 2018 12:10:31 GMT

i have 3.0V CR2032 lithium cell. In my circuit Vsup = 5.0 V, How to choose D1,D2 and R1 for proper working. waiting for your reply. Thanks

Re: Can we use coin cell battery backup for 8563t rtc?

weidong_sun — Mon, 23 Apr 2018 07:37:42 GMT

Hi,

For the D1/R1 you can find the related calculation method also in UM10301 page33/35.

Re: Can we use coin cell battery backup for 8563t rtc?

dhanash — Fri, 11 May 2018 04:39:49 GMT

I replaced rechargeable battery by coin cell battery (3.3V CR2032 lithium cell) then Date & Time is running. But every day 2 or 3 secs delayed. It is continuously POWER ON condition for one week. So totally 18 seconds delayed for a week. How to solve this Problem?

thank you