PCF85263ATLSLASHA datasheet(65/102 Pages) NXP

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NXP Semiconductors

PCF85263A

Tiny RTC/Calendar with Alarm Function, Battery Switch-Over, Time Stamp Input, and I2C-bus

10 Application design-in information

In this application, stop-watch mode is used to implement an elapsed time counter. The TS pin is used with

a mechanical switch to start and stop the time. Each time the time is stopped, timestamp2 is loaded with the

current time and an interrupt is generated on the INTA pin.

sample

invert

mechanical

switch detector

vdd_int

TS pin

sample

clock, 16 Hz

TSL

aaa-010560

STOP

control

STOPM

Time

counter

stop

TSR2

load

TSR2

flag

INTA

gen.

INTA

VSS

Figure 36. Application example

The RTC must be configured correctly for this mode of operation. Outlined in Table 65 are the settings needed

for this mode.

In addition, the time must be set and any other configurations, like battery switch-over and quartz oscillator

driving mode, which depend on the application.

The sampler circuit shown in Figure 36 holds invalid data until the mechanical switch detector mode is enabled.

It then requires a minimum of one sample period to initialize to the current TS pin level. Enable the mechanical

detector mode on the TS pin at least 62.5 ms before enabling the TS event mode. Failure to do so can result in

a false first event.

Section

Bit(s)

State

Comment

Pin_IO

Section 7.12

TSPM[1:0]

TS pin in input mode

Pin_IO

Section 7.12

TSIM

Select mechanical switch mode

Pin_IO

Section 7.12

TSL

TS pin input is active LOW

STOPM

Allow TS pin to control STOP

Function

Section 7.13

TSRIEA

Allow timestamps to create interrupts

Table 65. Application configuration

PCF85263A

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

Product data sheet

Rev. 5.4 — 12 December 2025

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