PCF85263ATLSLASHA datasheet(35/102 Pages) NXP

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NXP Semiconductors

PCF85263A

Tiny RTC/Calendar with Alarm Function, Battery Switch-Over, Time Stamp Input, and I2C-bus

Correction value

Every nth hour

Actual minute

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 the correction pulses are applied once per

second until the programmed correction values have been implemented.

Clock correction is made more frequently in OFFM = 1, but 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

PCF85263A

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Product data sheet

Rev. 5.4 — 12 December 2025

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