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PCF85263ATL/AX Datasheet(PDF) 34 Page - NXP Semiconductors

Part # PCF85263ATL/AX
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/AX Datasheet(HTML) 34 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
OFFSET[7:0]
Offset value in ppm
Offset value in decimal
Normal mode
OFFM = 0
Fast mode
OFFM = 1
011 1 1110
+126
+273.420
+256.3470
:
:
:
:
0000 0010
+2
+4.340
+4.0690
0000 0001
+1
+2.170
+2.0345
0000 0000 [1]
0
0 [1]
0 [1]
1111 1111
-1
-2.170
-2.0345
1111 1110
-2
-4.340
-4.0690
:
:
:
:
1000 0001
-127
-275.590
-258.3815
1000 0000
-128
-277.760
-260.416
Table 24. Offset values...continued
[1]
Default value.
The correction is made by adding or subtracting clock correction pulses. This operation changes the period of a
single second but not by changing the oscillator frequency.
It is possible to monitor when correction pulses are applied. For details, see Section 7.8.4.
7.8.1 Correction when OFFM = 0
The correction is triggered once every four hours and then the correction pulses are applied once per minute
until the programmed correction values have been implemented.
Correction value
Every nth hour
Actual minute
+1 or -1
4
00
+2 or -2
4
00 and 01
+3 or -3
4
00, 01, and 02
:
:
:
+59 or -59
4
00 to 58
+60 or -60
4
00 to 59
4
00 to 59
+61 or -61
4 + 1
00
4
00 to 59
+62 or -62
4 + 1
00 and 01
:
:
:
4
00 to 59
4 + 1
00 to 59
+123 or -123
4 + 2
00, 01, and 02
Table 25. Correction pulses for OFFM = 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
Document feedback
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