PCF85263ATLSLASHA datasheet(31/92 Pages) NXP

31 / 92 page

NXP Semiconductors

PCF85263A

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

OFFSET[7:0]

Offset value in ppm

Offset value in

decimal

Normal mode

OFFM = 0

Fast mode

OFFM = 1

011 1 1111

+127

+275.590

+258.3815

011 1 1110

+126

+273.420

+256.3470

0000 0010

+4.340

+4.0690

0000 0001

+2.170

+2.0345

0000 0000 [1]

0 [1]

1111 1111

-1

-2.170

-2.0345

1111 1110

-2

-4.340

-4.0690

1000 0001

-127

-275.590

-258.3815

1000 0000

-128

-277.760

-260.416

Table 24. Offset values

[1]

Default value.

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.

It is possible to monitor when correction pulses are applied. See Section 7.8.4.

7.8.1 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.

Correction value

Every nth hour

Actual minute

+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

4 + 1

00 to 59

+62 or -62

4 + 1

00 and 01

00 to 59

+123 or -123

4 + 1

00 to 59

Table 25. Correction pulses for OFFM = 0

PCF85263A

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Product data sheet

Rev. 5 — 1 February 2021

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