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PCF8523 датащи(PDF) 28 Page - NXP Semiconductors

номер детали PCF8523
подробное описание детали  Real-Time Clock (RTC) and calendar
PDF  66 Pages
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производитель  NXP [NXP Semiconductors]
домашняя страница  http://www.nxp.com
Logo NXP - NXP Semiconductors

PCF8523 датащи(HTML) 28 Page - NXP Semiconductors

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PCF8523
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 3 — 30 March 2011
28 of 66
NXP Semiconductors
PCF8523
Real-Time Clock (RTC) and calendar
8.8.1 Correction when MODE = 0
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.
[1]
The correction pulses on pin INT1 are 1
64 s wide.
In MODE = 0, any timer or clock output using a frequency below 64 Hz will be affected by
the clock correction (see Table 29).
8.8.2 Correction when MODE = 1
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 59th second.
Clock correction is made more frequently in MODE = 1; however, this can result in higher
power consumption.
Table 28.
Correction pulses for MODE = 0
Correction value
Hour
Minute
Correction pulses on
INT1 per minute[1]
+1 or
1
02001
+2 or
2
02
00 and 01
1
+3 or
3
02
00, 01, and 02
1
::::
+59 or
59
02
00 to 58
1
+60 or
60
02
00 to 59
1
+61 or
61
02
00 to 59
1
03
00
1
+62 or
62
02
00 to 59
1
03
00 and 01
1
+63 or
63
02
00 to 59
1
03
00, 01, and 02
1
64
02
00 to 59
1
03
00, 01, 02, and 03
1
Table 29.
Effect of clock correction for MODE = 0
CLKOUT frequency (Hz)
Effect of correction
Timer source clock
frequency (Hz)
Effect of
correction
32768
no effect
4096
no effect
16384
no effect
64
no effect
8192
no effect
1
effected
4096
no effect
1
60
effected
1024
no effect
1
3600
effected
32
effected
-
-
1effected
-
-



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