PCF85263ATLSLASHA datasheet(50/102 Pages) NXP

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NXP Semiconductors

PCF85263A

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

sample

invert

mechanical

switch detector

vdd_int

80 kΩ/

40 kΩ

TS (CLK/INTB) pin (1)

sample clock

TSL

input data

INTB data

clock data

aaa-010443

1. Not available in all package types.

Figure 29. TS pin

TSIM is only considered when the TS pin is in input mode.

7.12.4.1 TS pin output mode; INTB

It is possible to output INTB data on the TS pin. The output is push-pull. No output is available when on VBAT.

When on VBAT, the output is Hi-Z.

7.12.4.2 TS pin output mode; CLK

It is possible to output a clock frequency on the TS pin. Clock frequency is selected with the COF[2:0] bits in the

function register (Section 7.13). The output is push-pull. No output is available when on VBAT. When on VBAT,

the output is Hi-Z.

7.12.4.3 TS pin disabled

When disabled, the pin is Hi-Z and can be left floating.

7.12.5 TSIM: TS pin input type control

Bit

Symbol

Value

Description

TS pin input mode

0 [1]

CMOS input; reference to VDD; disabled when on VBAT

TSIM

Mechanical switch mode; active pullup sampled at 16

Hz; operates on VDD and VBAT

Table 47. TSIM bit - Pin_IO control register (address 27h)

[1]

Default value.

In CMOS input mode (TSIM = 0), input is taken directly from the TS pin. The input is conditioned by the setting

of TSL. When operating on the battery voltage (VBAT), the input is disabled and is allowed to float.

In mechanical switch detector mode (TSIM = 1), the TS pin is sampled at a rate of 16 Hz for 30.5 μs. At the

same time as the sample, a pullup resistor is activated to detect an open pin or a pin shorted to VSS. The input

PCF85263A

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Product data sheet

Rev. 5.4 — 12 December 2025

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