FusionClient – User Guide (Rev. 1.3)
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4.1.
RTC (GoldCap)
The baseboard of the FusionClient provides an “external RTC” module connected via the I2C Bus. An RTC
module of type RV-8564 or compatible is used. To provide a valid date and time when no power is
connected to the system, the RTC module is equipped with a GoldCap buffer.
4.1.1.
RTC Buffer Time
The RTC buffer time is depending of the ambient temperature. For a better understanding of the differing
behavior of the GoldCap buffer integrated in your system, refer to the diagram below:
Figure 2: RTC buffer time depending on temperature
If the time is not valid this is indicated by a status bit in the RTC registers. For details see the RV-8564
application manual.
To get the maximum buffer time, it is necessary to have the system for at least 1
day powered on. This ensures that the buffer capacitors are fully loaded.
The buffer time depends on the ambient temperature and on how long the system
is connected to the power supply.
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