pcf85263a offset adjust

pivent — Tue, 16 Apr 2019 01:54:49 GMT

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 ?

-----------------

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.

-------------

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

Re: pcf85263a offset adjust

guoweisun — Tue, 23 Apr 2019 08:03:03 GMT

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

Other NXP ProductsのトピックRe: pcf85263a offset adjust

pcf85263a offset adjust

Re: pcf85263a offset adjust