PCF85263ATLSLASHA datasheet(49/102 Pages) NXP

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NXP Semiconductors

PCF85263A

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

Setting the CLKPM bit disables the CLK output and forces the pin to drive out a logic 0. Clearing this bit enables

the pad to output the selected clock frequency. To see bits COF[2:0] in the function register, see Table 50.

7.12.2 TSPULL: TS pin pullup resistor value

Bit

Symbol

Value

Description

TS pin pullup resistor value

0 [1]

80 kΩ

TSPULL

40 kΩ

Table 44. TSPULL bit - Pin_IO control register (address 27h)

[1]

Default value.

Controls the pullup resistor value used in the mechanical switch detector. For applications where there is a

large capacitance on the TS pin, for example, from a long connecting cable to the mechanical switch, the pullup

resistor value can be halved to improve switch detection.

Using the low-resistance value increases current consumption when the switch is closed, i.e., shorting to VSS.

7.12.3 TSL: TS pin level sense

Bit

Symbol

Value

Description

TS pin input sense

0 [1]

Active HIGH

TSL

Active LOW

Table 45. TSL bit - Pin_IO control register (address 27h)

[1]

Default value.

The active state of the TS pin can be defined for use as a timestamp trigger and/or as stop control for the time

counting. Active HIGH implies a transition from logic 0 to logic 1 is active. Active LOW implies a transition from

logic 1 to logic 0 is active.

7.12.4 TSPM[1:0]: TS pin I/O control

Bit

Symbol

Value

Description

TS pin IO mode

00 [1]

Disabled; input can be left floating

INTB output; push-pull

CLK output; push-pull

3 to 2

TSPM[1:0]

Input mode

Table 46. TSPM[1:0] bits - Pin_IO control register (address 27h)

[1]

Default value.

These bits control the operation of the TS pin.

PCF85263A

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Product data sheet

Rev. 5.4 — 12 December 2025

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