PCF85363ATLSLASHA datasheet(61/86 Pages) NXP

61 / 86 page

NXP Semiconductors

PCF85363A

Tiny Real-Time Clock/calendar with 64 byte RAM, alarm function, battery switch-over time stamp input,

and I2C-bus

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,

quartz oscillator driving mode, etc., which are dependent on the application.

The sampler circuit shown in Figure 34 will hold 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. It is recommended to 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

TSRIEA

allow timestamps to create interrupts

Function

Section 7.13

ILPA

generate interrupt pulses

TSR_mode Section 7.12

TSR2M[2:0]

101

last event mode for timestamp2

Pin_IO

Section 7.12

INTAPM[1:0]

output interrupt on INTA

Table 65. Application configuration

Figure 35 shows the waveforms that can be expected. sample clock, vdd_int and stop

are internal nodes. vdd_int is supply which operates the IC and will be either VDD or VBAT,

depending on the state of the battery switch-over.

sample clock, 16 Hz

TS pin

switch SW 1

stop

running

stopwatch

TSR2

INTA

open

closed

stopped

running

TSR2 = t4

TS pin sampled

vdd_int

floating

VSS

aaa-010561

Figure 35. Application example timing

• At and before t1, SW1 is open (TS pin floating). The TS pin is sampled and the internal

pull-up resistor will pull the pin HIGH to vdd_int. No actions are taken by the IC.

• At t2, SW1 is still open. No action is taken by the IC.

PCF85363A

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

Product data sheet

Rev. 3.1 — 18 June 2021

61 / 86

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