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EM3027IDSWS8 датащи(PDF) 7 Page - EM Microelectronic - MARIN SA

номер детали EM3027IDSWS8
подробное описание детали  Real Time Clock with I2C or SPI, Crystal Temperature Compensation, Battery Switchover and Trickle Charger
PDF  28 Pages
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производитель  EMMICRO [EM Microelectronic - MARIN SA]
домашняя страница  http://www.emmicroelectronic.com
Logo EMMICRO - EM Microelectronic - MARIN SA

EM3027IDSWS8 датащи(HTML) 7 Page - EM Microelectronic - MARIN SA

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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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