Question about RTC trimming of LPC1756

Discussion created by lpcware Employee on Jun 15, 2016
Latest reply on Jun 15, 2016 by lpcware
Content originally posted in LPCWare by wookjina on Mon Apr 02 04:57:48 MST 2012
Hi all,
I know the RTC of LPC1756 have to calibrate according to AN10849
(link http://ics.nxp.com/support/documents/microcontrollers/zip/an10849.zip)
But I wonder how to calibrate each boards on MP stage?
The AN10849 shows how to determine only one board for example.
Actually, I have serveral LPC1756 boards and each boards has an error within maximum 10 minutes per day.
Who have any idea or something about it? please advice me.