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EM3027SDXWS8 Datasheet(PDF) 7 Page - EM Microelectronic - MARIN SA |
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EM3027SDXWS8 Datasheet(HTML) 7 Page - EM Microelectronic - MARIN SA |
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7 / 28 page  EM3027 Copyright 2013, EM Microelectronic-Marin SA 3027-DS.doc, Version 8.0, 25-Jan-13 7 www.emmicroelectronic.com 4.3 Crystal Thermal Behaviour The frequency of the crystal is dependent on the temperature concurring with the following diagram: Figure 1: Crystal thermal behaviour TO – Turnover temperature [°C] FO – Crystal frequency when TO [Hz] The following formula expresses a compensation value to be used during frequency correction. XtalOffset 2 To) (T Qcoef COMP_val Qcoef – Thermal quadratic coefficient [ppm/°C 2] T – Actual temperature [°C] TO – Turnover temperature [°C] XtalOffset – Crystal offset at T O [ppm] COMP_val – Compensation value result [ppm] The oscillator frequency is adjusted according to the equation above by using coefficients located in the EEPROM control page and the temperature. The actual temperature can be obtained from the internal thermometer or from Temp register updated externally by an application. The principle of the frequency compensation is based on adding/removing of pulses. Example 1: Qcoef=0.035; TO=25; XtalOffset=–100 -600 -400 -200 0 200 400 600 -50 0 50 100 150 Temperature [ppm] Compensation Value Crystal Error Example 2: Qcoef=0.035; TO=25; XtalOffset=+100 -400 -300 -200 -100 0 100 200 300 400 -50 0 50 100 150 Tem perature [ppm ] Compensation Value Crystal Error -400 -300 -200 -100 0 Temperature [°C] TO+100 TO+50 TO TO-50 TO-100 T [°C] F FO [ppm] |
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