PCF8564A datasheet(17/59 Pages) NXP

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PCA85063A

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Product data sheet

Rev. 4 — 30 March 2018

17 of 59

NXP Semiconductors

PCA85063A

Automotive Real-Time Clock/calendar with alarm function and I2C-bus

8.2.3.2

Correction when MODE = 1

The correction is triggered once every four minutes and then correction pulses are applied

once per second up to a maximum of 60 pulses. When correction values greater than 60

pulses are used, additional correction pulses are made in the 59th second.

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

power consumption.

[1]

The correction pulses on pin INT are 1⁄1024 s wide. For multiple pulses, they are repeated at an interval of

1⁄512 s.

In MODE = 1, any timer source clock using a frequency below 1.024 kHz is also affected

by the clock correction (see Table 17).

Table 16.

Correction pulses for MODE = 1

Correction value

Update every nth

minute

Second

Correction pulses on

INT per second[1]

+1 or

12

+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

00 to 58

259

+62 or

62

00 to 58

259

+63 or

63

00 to 58

259

64

00 to 58

259

Table 17.

Effect of correction pulses on frequencies for MODE = 1

Frequency (Hz)

Effect of correction

CLKOUT

32768

no effect

16384

no effect

8192

no effect

4096

no effect

2048

no effect

1024

no effect

1affected

Timer source clock

4096

no effect

affected

1affected

1⁄60

affected

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