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PCF8523TS/1 Datasheet(PDF) 31 Page - NXP Semiconductors |
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PCF8523TS/1 Datasheet(HTML) 31 Page - NXP Semiconductors |
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31 / 75 page  PCF8523 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved. Product data sheet Rev. 4 — 5 July 2012 31 of 74 NXP Semiconductors PCF8523 Real-Time Clock (RTC) and calendar 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: Fig 18. Offset calibration calculation workflow Measure the frequency on pin CLKOUT: fmeas Convert to time: tmeas = 1 / fmeas Calculate the difference to the ideal period of 1 / 32768.00: Dmeas = 1 / 32768 - tmeas Calculate the ppm deviation compared to the measured value: Eppm = 1000000 × Dmeas / tmeas Calculate the offset register value: Mode = 0 (low power): Offset value = Eppm / 4.34 Mode = 1 (fast correction) Offset value = Eppm / 4.069 013aaa683 Example 32768.48 Hz 30.5171 µs 0.000447 µs 14.6484 ppm 3.375 3 correction pulses are needed 3.600 4 correction pulses are needed |
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