Functional Description
29
Battery
The cPCI-3920 is provided with a 3.0 V “coin cell” lithium battery
for the RTC. To replace the battery, proceed as follows:
X
Turn off power
X
Remove the battery
X
Place the new battery in the socket.
X
Make sure that you insert the battery the right way round.
The plus pole must be on the top!
The lithium battery must be replaced with an identical battery
or a battery type recommended by the manufacturer. Suitable
batteries include the VARTA CR2025 and PANASONIC BR2020.
Note:
The user must be aware that the battery’s operational tem-
perature range is less than that of the cPCI-3920’s storage
temperature range. For exact range information, refer to the
battery manufacturer’s specifications.
Note:
Care must be taken to ensure that the battery is correctly re-
placed.The battery should be replaced only with an iden-
tical or equivalent type recommended by the
manufacturer.Dispose of used batteries according to the
manufacturer’s instructions.The typical life expectancy of a
225 mAh battery (VARTA CR2032) is 4-5 years with an av-
erage on-time of 8 hours per working day at an operating
temperature of 30°C. However, this typical value varies con-
siderably because the life expectancy is dependent on the
operating temperature and the standby time (shutdown time)
of the system in which it operates.To ensure that the lifetime
of the battery has not been exceeded, it is recommended to
exchange the battery after 3-4 years.
Reset
The cPCI-3920 is automatically reset by a precision voltage moni-
toring circuit that detects a drop in voltage below the acceptable
operating limit of 4.45V for the 5V line and below 2.8V for the 3.3V
line. Other reset sources include the Watchdog Timer and the
local push-button switch (only on 8HP). The cPCI-3920 responds
to any of these sources by initializing local peripherals.
Содержание cPCI-3920 Series
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Страница 25: ...Specifications 15 cPCI R3920 cPCI R3920T Figure 2 2 cPCI R3920 Mechanical Dimensions ...
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