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EM3027 Datasheet(PDF) 7 Page - EM Microelectronic - MARIN SA

Part # EM3027
Description  Real Time Clock with I2C or SPI, Crystal Temperature Compensation, Battery Switchover and Trickle Charger
PDF  28 Pages
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Manufacturer  EMMICRO [EM Microelectronic - MARIN SA]
Direct Link  http://www.emmicroelectronic.com
Logo EMMICRO - EM Microelectronic - MARIN SA

EM3027 Datasheet(HTML) 7 Page - EM Microelectronic - MARIN SA

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EM3027
Copyright © 2009, EM Microelectronic-Marin SA
12/09 – rev D
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 TO [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
Temperature
[ppm]
Compensation Value
Crystal Error
-400
-300
-200
-100
0
Temperature [°C]
T
O+100
T
O+50
T
O
T
O-50
T
O-100
T [°C]
ΔF
F
O
[ppm]



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