pcf85263a offset adjust

[pivent]

Hi,

I am using  PCF85263A RTC chipset in my product.

It gets faster every day. So, I want to adjust offset register. (24h Offset OFFSET[7:0])

I don't under stand 2 point.

1. I want to slow RTC .   Now RTC get faster every day. Then adding or subtracting  clock ? 

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The correction is made by adding or subtracting clock correction pulses, thereby changing
the period of a single second but not by changing the oscillator frequency. 

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2.  , Would you explain more about below?   once every four hours ?  once per minute ?

 Correction when OFFM = 0  

The correction is triggered once every four hours and then correction pulses are applied
once per minute until the programmed correction values have been implemented

Best Regards

Jae Won

[guoweisun]

Hi

Please see comment for your questions:

1: A positive value written to the Offset Register will cause the RTC device to run slower and a negative value written to the Offset Register will cause the RTC device to run faster.

2：For the example you can refer to datasheet page37 Figure19