PCF8523 NXP [NXP Semiconductors], PCF8523 Datasheet - Page 28

• Manufacturer Part Number: PCF8523
• Description: Real-Time Clock (RTC) and calendar
• Manufacturer: NXP [NXP Semiconductors]

NXP Semiconductors
PCF8523
Product data sheet
8.8.1 Correction when MODE = 0
8.8.2 Correction when MODE = 1
The correction is triggered once per two hours and then correction pulses are applied
once per minute until the programmed correction values have been implemented.
Table 28.
[1]
In MODE = 0, any timer or clock output using a frequency below 64 Hz will be affected by
the clock correction (see
Table 29.
The correction is triggered once per minute and then correction pulses are applied once
per second up to a maximum of 60 pulses. When correction values greater than 60 pulses
are used, additional correction pulses are made in the 59
Clock correction is made more frequently in MODE = 1; however, this can result in higher
power consumption.
Correction value
+1 or 1
+2 or 2
+3 or 3
:
+59 or 59
+60 or 60
+61 or 61
+62 or 62
+63 or 63
64
CLKOUT frequency (Hz) Effect of correction
32768
16384
8192
4096
1024
32
1
The correction pulses on pin INT1 are
Correction pulses for MODE = 0
Effect of clock correction for MODE = 0
All information provided in this document is subject to legal disclaimers.
Hour
02
02
02
:
02
02
02
03
02
03
02
03
02
03
Rev. 3 — 30 March 2011
Table
no effect
no effect
no effect
no effect
no effect
effected
effected
29).
1

64
s wide.
Minute
00
00 and 01
00, 01, and 02
:
00 to 58
00 to 59
00 to 59
00
00 to 59
00 and 01
00 to 59
00, 01, and 02
00 to 59
00, 01, 02, and 03
Timer source clock
frequency (Hz)
4096
64
1
1
1
-
-


60
3600
Real-Time Clock (RTC) and calendar
th
second.
Correction pulses on
INT1 per minute
1
1
1
:
1
1
1
1
1
1
1
1
1
1
Effect of
correction
no effect
no effect
effected
effected
effected
-
-
PCF8523
© NXP B.V. 2011. All rights reserved.
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