PCF8564A datasheet(17/86 Pages) NXP

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NXP Semiconductors

PCA2131

Nano-power highly accurate RTC with integrated quartz crystal for automotive applications

AO[3:0]

Decimal

Binary

ppm

0000

+16

0001

+14

0010

+12

0011

+10

0100

0101

0110

0111

1000

[1] 0

1001

-2

1010

-4

1011

-6

1100

-8

1101

-10

1110

-12

1111

-14

Table 21. Frequency correction at 25 °C, typical

[1]

Default value.

7.5 Power management functions

The PCA2131 has two power supplies:

VDD - the main power supply

VBAT - the battery backup supply

Internally, PCA2131 operates with the internal operating voltage Voper(int) which is also

available as VBBS on the battery backed output voltage pin, BBS. Depending on the

condition of the main power supply and the selected power management function,

Voper(int) is either on the potential of VDD or VBAT.

Two power management functions are implemented:

Battery switch-over function - monitors the main power supply VDD and switching to

VBAT in case a power fail condition is detected (see Section 7.5.1).

Battery low detection function - monitors the status of the battery, VBAT (see

Section 7.5.2).

The power management functions are controlled by the control bits PWRMNG[2:0] (see

Table 22) in register Control_3 (see Table 10):

PCA2131

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

Product data sheet

Rev. 1.0 — 26 July 2021

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