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PCF85063TP/1Z

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36P37-P39P40-P42P43-P45P46-P48P49-P51P52-P52
PCF85063TP All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2015. All rights reserved.
Product data sheet Rev. 4 — 6 May 2015 13 of 52
NXP Semiconductors
PCF85063TP
Tiny Real-Time Clock/calendar
8.2.3 Register Offset
The PCF85063TP incorporates an offset register (address 02h) which can be used to
implement several functions, such as:
• Accuracy tuning
• Aging adjustment
• Temperature compensation
[1] Default value.
For MODE = 0, each LSB introduces an offset of 4.34 ppm. For MODE = 1, each LSB
introduces an offset of 4.069 ppm. The offset value is coded in two’s complement giving a
range of +63 LSB to 64 LSB.
[1] Default value.
The correction is made by adding or subtracting clock correction pulses, thereby changing
the period of a single second but not by changing the oscillator frequency.
It is possible to monitor when correction pulses are applied. To enable correction interrupt
generation, bit CIE (register Control_1) has to be set logic 1. At every correction cycle a
pulse is generated on pin INT
. The pulse width depends on the correction mode. If
multiple correction pulses are applied, an interrupt pulse is generated for each correction
pulse applied.
Table 12. Offset - offset register (address 02h) bit description
Bit Symbol Value Description
7MODE offset mode
0
[1]
normal mode: offset is made once every two
hours
1 course mode: offset is made every 4 minutes
6 to 0 OFFSET[6:0] see Table 13
offset value
Table 13. Offset values
OFFSET[6:0] Offset value in
decimal
Offset value in ppm
Normal mode
MODE = 0
Fast mode
MODE = 1
0111111 +63 +273.420 +256.347
0111110 +62 +269.080 +252.278
:: : :
0000010 +2 +8.680 +8.138
0000001 +1 +4.340 +4.069
0000000
[1]
00
[1]
0
[1]
1111111 1 4.340 4.069
1111110 2 8.680 8.138
:: : :
1000001 63 273.420 256.347
1000000 64 277.760 260.416
PCF85063TP All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2015. All rights reserved.
Product data sheet Rev. 4 — 6 May 2015 14 of 52
NXP Semiconductors
PCF85063TP
Tiny Real-Time Clock/calendar
8.2.3.1 Correction when MODE = 0
The correction is triggered once every 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 INT are
1
⁄
64
s wide.
In MODE = 0, any timer or clock output using a frequency below 64 Hz is affected by the
clock correction (see Table 15
).
8.2.3.2 Correction when MODE = 1
The correction is triggered once every four minutes 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
th
second.
Table 14. Correction pulses for MODE = 0
Correction value Update every n
th
hour Minute Correction pulses on
INT
per minute
[1]
+1 or 12 00 1
+2 or 2 2 00 and 01 1
+3 or 3 2 00, 01, and 02 1
::::
+59 or 59 2 00 to 58 1
+60 or 60 2 00 to 59 1
+61 or 61 2 00 to 59 1
2nd and next hour 00 1
+62 or 62 2 00 to 59 1
2nd and next hour 00 and 01 1
+63 or 63 02 00 to 59 1
2nd and next hour 00, 01, and 02 1
64 02 00 to 59 1
2nd and next hour 00, 01, 02, and 03 1
Table 15. Effect of correction pulses on frequencies for MODE = 0
Frequency (Hz) Effect of correction
CLKOUT
32768 no effect
16384 no effect
8192 no effect
4096 no effect
2048 no effect
1024 no effect
1affected
Timer source clock
4096 no effect
64 no effect
1affected
1
⁄
60
affected
PCF85063TP All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2015. All rights reserved.
Product data sheet Rev. 4 — 6 May 2015 15 of 52
NXP Semiconductors
PCF85063TP
Tiny Real-Time Clock/calendar
Clock correction is made more frequently in MODE = 1; however, this can result in higher
power consumption.
[1] The correction pulses on pin INT are
1
⁄
1024
s wide. For multiple pulses, they are repeated at an interval of
1
⁄
512
s.
In MODE = 1, any timer source clock using a frequency below 1.024 kHz is also affected
by the clock correction (see Table 17
).
Table 16. Correction pulses for MODE = 1
Correction value Update every n
th
minute
Second Correction pulses on
INT per second
[1]
+1 or 12 00 1
+2 or 2 2 00 and 01 1
+3 or 3 2 00, 01, and 02 1
::::
+59 or 59 2 00 to 58 1
+60 or 60 2 00 to 59 1
+61 or 61 2 00 to 58 1
2592
+62 or 62 2 00 to 58 1
2593
+63 or 63 2 00 to 58 1
2594
64 2 00 to 58 1
2595
Table 17. Effect of correction pulses on frequencies for MODE = 1
Frequency (Hz) Effect of correction
CLKOUT
32768 no effect
16384 no effect
8192 no effect
4096 no effect
2048 no effect
1024 no effect
1affected
Timer source clock
4096 no effect
64 affected
1affected
1
⁄
60
affected
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36P37-P39P40-P42P43-P45P46-P48P49-P51P52-P52

PCF85063TP/1Z

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Description:
Real Time Clock Low Power Real time clocks
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