PCF2131 datasheet(7/85 Pages) NXP

7 / 85 page

NXP Semiconductors

PCF2131

Nano-power highly accurate RTC with integrated quartz crystal

Bit positions labeled as T are unused and return 0 when read. Bits labeled as X are undefined at power-on and unchanged by subsequent resets.

Bit

Address

Reset value

Reference

Control registers

00h

Control_1

EXT_

TEST

TC_DIS

STOP

100TH_

S_DIS

POR_

OVRD

12_24

0000 1000

Table 5

01h

Control_2

MSF

WDTF

AIE

0000 0000

Table 7

02h

Control_3

PWRMNG[2:0]

BTSE

BLF

BIE

BLIE

1110 0000

Table 9

03h

Control_4

TSF1

TSF2

TSF3

TSF4

0000 0000

Table 11

04h

Control_5

TSIE1

TSIE2

TSIE3

TSIE4

0000 0000

Table 13

Software Reset

05h

SR_Reset

CPR

CTS

0010 0100

Table 24

Time and date registers

06h

100th_Seconds

100TH_SECONDS(0 to 99)

0000 0000

Table 25

07h

Seconds

OSF

SECONDS (0 to 59)

1000 0000

Table 28

08h

Minutes

MINUTES (0 to 59)

0000 0000

Table 31

AMPM

HOURS (1 to 12) in 12-hour mode

0000 0000

09h

Hours

HOURS (0 to 23) in 24-hour mode

0000 0000

Table 33

0Ah

Days

DAYS (1 to 31)

0000 0001

Table 35

0Bh

Weekdays

WEEKDAYS (0 to 6)

0000 0001

Table 37

0Ch

Months

MONTHS (1 to 12)

0000 0001

Table 40

0Dh

Years

YEARS (0 to 99)

0000 0001

Table 43

Alarm registers

0Eh

Second_alarm

AE_S

SECOND_ALARM (0 to 59)

1000 0000

Table 45

0Fh

Minute_alarm

AE_M

MINUTE_ALARM (0 to 59)

1000 0000

Table 47

AMPM

HOUR_ALARM (1 to 12) in 12-hour mode

1000 0000

10h

Hour_alarm

AE_H

HOUR_ALARM (0 to 23) in 24-hour mode

1000 0000

Table 49

11h

Day_alarm

AE_D

DAY_ALARM (1 to 31)

1000 0000

Table 51

12h

Weekday_alarm

AE_W

WEEKDAY_ALARM (0 to 6)

1000 0000

Table 53

CLKOUT control register

Table 4. Register overview

PCF2131

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

Product data sheet

Rev. 2.0 — 5 October 2023

7 / 85

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