PCF85263ATLSLASHA datasheet(46/102 Pages) NXP

Part #	PCF85263ATL/A

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

PDF	102 Pages

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Manufacturer	NXP [NXP Semiconductors]

Direct Link	http://www.nxp.com

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NXP Semiconductors

PCF85263A

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

7.11.3.2 Switching at the VBAT level, BSM[1:0] = 01

aaa-010425

internal power supply

cleared via interface

BSF

Vth

VDD (= 0 V)

VBAT

VDD

INTA

battery mode indication

interface active

interface inactive

interface active

I2C

Figure 26. Switching at VBAT

7.11.3.3 Switching at the higher of VBAT or Vth level, BSM[1:0] = 10

With this mode, switching takes place when VDD falls below the higher of Vth or VBAT. In Figure 27, an example

is given where the threshold is set to 1.5 V and a single cell battery is connected to VBAT. In this example,

switching to the battery voltage takes place when VDD falls below Vth.

PCF85263A

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Product data sheet

Rev. 5.4 — 12 December 2025

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PCF85263ATL/A Datasheet(PDF) 46 Page - NXP Semiconductors