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PCF85263ATL/A Datasheet(PDF) 25 Page - NXP Semiconductors

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
Logo NXP - NXP Semiconductors

PCF85263ATL/A Datasheet(HTML) 25 Page - NXP Semiconductors

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NXP Semiconductors
PCF85263A
Tiny RTC/Calendar with Alarm Function, Battery Switch-Over, Time Stamp Input, and I2C-bus
aaa-009583
SECOND ALARM1
SECOND TIME
SEC_A1E
0
1
SEC_A1E = 0
example
=
MINUTE ALARM1
MINUTE TIME
MIN_A1E
=
HR_xx_xx_00 ALARM1
xx_xx_00 HOUR TIME
HR_xx_xx_00_A1E
set alarm flag A1F (1)
=
HR_xx_00_xx ALARM1
xx_00_xx HOUR TIME
HR_xx_00_xx_A1E
=
HR_00_xx_xx ALARM1
00_xx_xx HOUR TIME
HR_00_xx_xx_A1E
=
check now signal
0
1
MIN_A2E = 0
example
MINUTE ALARM2
MINUTE TIME
MIN_A2E
=
HR_xx_00 ALARM2
xx_xx_00 HOUR TIME
HR_xx_00_A2E
set alarm flag A2F (1)
=
HR_00_xx ALARM2
xx_00_xx HOUR TIME
HR_00_xx_A2E
=
check now signal
1. Only when all enabled alarm settings are matching.
The flag is set
only on increment to a matched case (and not every time it is equal).
Figure 14. Alarm1 and alarm2 function block diagram (stop-watch mode)
7.4.3 Alarm interrupts
The generation of interrupts from the alarm functions is controlled via the alarm interrupt enable bits; A1IEA,
A1IEB, A2IEA, A2IEB. These bits are in registers INTA_enable (address 29h) and INTB_enable (address 2Ah).
The assertion of flags A1F or A2F can be used to generate an interrupt at the pins INTA and INTB. The
interrupt can be generated as a pulse signal every time the time increments to match the alarm setting or as a
permanently active signal that follows the condition of bit A1F and/or A2F. See Section 7.9 for interrupt control.
PCF85263A
All information provided in this document is subject to legal disclaimers.
© 2025 NXP B.V. All rights reserved.
Product data sheet
Rev. 5.4 — 12 December 2025
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