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PCF85263ATL/A Datasheet(PDF) 19 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) 19 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-009581
SECONDS
100 Hz tick
MINUTES
HR_XX_XX_00
HR_XX_00_XX
HR_00_XX_XX
100TH_SECONDS
100TH
1 Hz tick
Figure 12. Data flow for the stop-watch function
7.4 Alarms
There are two independent alarms. Each is separately configured and can be used to generate an interrupt. In
RTC mode, an alarm is configured for time and date. In stop-watch mode, when the RTC is functioning as an
elapsed time counter, an alarm is configured for time only.
7.4.1 Alarms in RTC mode
In RTC mode, Alarm 1 can be configured from seconds to months. Alarm 2 operates on minutes, hours, and
weekdays. Each segment of the time is independently enabled. Alarms can be output on the INTA and INTB
pins.
7.4.1.1 Alarm1 and alarm2 registers in RTC mode
Setting the time for alarm1: Only the relevant information for the alarm condition has to be programmed. The
unused parts are ignored.
Bit positions labeled as - are not implemented.
Upper-digit (ten’s place)
Digit (unit place)
Address
Register name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
RTC alarm1 registers
08h
Second_alarm1
-
0 to 5
0 to 9
09h
Minute_alarm1
-
0 to 5
0 to 9
AMPM 0 to 1
0 to 9
0Ah
Hour_alarm1
-
-
0 to 2
0 to 9
0Bh
Day_alarm1
-
-
0 to 3
0 to 9
Table 12. Alarm1 and alarm2 registers in RTC mode coded in BCD (RTCM = 0)
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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