PCF8523 View Datasheet(PDF) - NXP Semiconductors.
Part Name
Description
MFG CO.
'PCF8523' PDF : 74 Pages View PDF
NXP Semiconductors
PCF8523
Real-Time Clock (RTC) and calendar
Table 32. Correction pulses for MODE = 1
Correction value
Update every nth
minute
+1 or 1
2
+2 or 2
2
+3 or 3
2
:
:
+59 or 59
2
+60 or 60
2
+61 or 61
2
2
+62 or 62
2
2
+63 or 63
2
2
64
2
2
Second
00
00 and 01
00, 01, and 02
:
00 to 58
00 to 59
00 to 58
59
00 to 58
59
00 to 58
59
00 to 58
59
Correction pulses on
INT1 per second[1]
1
1
1
:
1
1
1
2
1
2
1
4
1
5
[1] The correction pulses on pin INTx are 1⁄4096 s wide. For multiple pulses, they are repeated at an interval of
1⁄2048 s.
In MODE = 1, clock outputs and timer source clocks affected by the clock correction are
as shownin Table 33.
Table 33. Effect of clock correction for MODE = 1
CLKOUT frequency (Hz) Effect of correction Timer source clock
frequency (Hz)
32 768
no effect
4 096
16 384
no effect
64
8 192
no effect
1
4 096
1 024
32
no effect
no effect
affected
1⁄60
1⁄3 600
-
1
affected
-
Effect of
correction
no effect
affected
affected
affected
affected
-
-
8.8.3 Offset calibration workflow
The calibration offset has to be calculated based on the time. Figure 18 shows the
workflow how the offset register values can be calculated:
PCF8523
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 7 — 28 April 2015
© NXP Semiconductors N.V. 2015. All rights reserved.
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