PCF85263ATSLASHA datasheet(32/92 Pages) NXP

32 / 92 page

NXP Semiconductors

PCF85263A

Tiny Real-Time Clock/calendar with alarm function, battery switch-over, time stamp input, and I2C-bus

Correction value

Every nth hour

Actual minute

4 + 2

00, 01, and 02

00 to 59

4 + 1

00 to 59

-128

4 + 2

00 to 07

Table 25. Correction pulses for OFFM = 0...continued

7.8.2 Correction when OFFM = 1

The correction is triggered once every eight minutes and then correction pulses

are applied once per second until the programmed correction values have been

implemented.

Clock correction is made more frequently in OFFM = 1; however, this can result in higher

power consumption.

Correction value

Every nth minute

Actual second

+1 or -1

+2 or -2

00 and 01

+3 or -3

00, 01, and 02

+59 or -59

00 to 58

+60 or -60

00 to 59

+61 or -61

8 + 1

00 to 59

+62 or -62

8 + 1

00 and 01

00 to 59

8 + 1

00 to 59

+123 or -123

8 + 2

00, 01, and 02

00 to 59

8 + 1

00 to 59

-128

8 + 2

00 to 07

Table 26. Correction pulses for OFFM = 1

7.8.3 Offset calibration workflow

The calibration offset has to be calculated based on the time. Figure 20 shows the

workflow how the offset register values can be calculated:

PCF85263A

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 5 — 1 February 2021

32 / 92

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