PCF8564A datasheet(12/86 Pages) NXP

12 / 86 page

NXP Semiconductors

PCA2131

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

Bit

Symbol

Value

Description

Reference

7 to 5

PWRMNG[2:0]

see

Table 22

control of the battery switch-over, battery low

detection, and extra power fail detection functions

Section 7.5

no timestamp when battery switch-over occurs

BTSE

time-stamped when battery switch-over occurs

Section 7.12.4

no battery switch-over interrupt occurred

flag set when battery switch-over occurs;

flag must be cleared to clear interrupt

Section 7.5.1

and

Section 7.12.4

battery status ok;

no battery low interrupt generated

BLF

battery status low;

flag cannot be cleared by command, flag is

automatically cleared when battery is replaced.

Section 7.5.2

no interrupt generated from the battery flag (BF)

BIE

interrupt generated when BF is set

Section 7.13.6

no interrupt generated from battery low flag (BLF)

BLIE

interrupt generated when BLF is set

Section 7.13.7

Table 10. Control_3 - control and status register 3 (address 02h) bit description

7.2.4 Register Control_4

Bit

Symbol

TSF1

TSF2

TSF3

TSF4

Reset

value

Table 11. Control_4 - control and status register 4 (address 03h) bit allocation

Bit

Symbol

Value

Description

Reference

no timestamp interrupt generated for pin TS1

TSF1

flag set when TS1 input is driven to ground;

flag must be cleared to clear interrupt

Section 7.12.1

no timestamp interrupt generated when pin TS2

TSF2

flag set when TS2 input is driven to ground;

flag must be cleared to clear interrupt

Section 7.12.1

no timestamp interrupt generated for pin TS3

TSF3

flag set when TS3 input is driven to ground;

flag must be cleared to clear interrupt

Section 7.12.1

no timestamp interrupt generated when pin TS4

TSF4

flag set when TS4 input is driven to ground;

flag must be cleared to clear interrupt

Section 7.12.1

Unused

Table 12. Control_4 - control and status register 4 (address 03h) bit description

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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