Cpu Backup Battery; Сьеаммс - Icom IC -765 Instruction Manual

10-4 CPU BACKUP BATTERY
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Tech Talk from Icom
O.
A.
Why is a lithium battery usually used for memory
backup?
Because the self-discharge of the lithium battery is
very low compared to other batteries. This means
the battery voltage or capacity decreases only a
little even if the battery is left for several years
without connection. ;
An interesting technical point is the life expectancy
of the lithium battery on the LOGIC unit. Our
lithium battery, BR2032-1T2, is rated at a 180 mAh
capacity.
Icom has made calculations for the battery life in
the worst case situation such as when the battery
MAINTENANCE 1 O
The CPU in the 1C-765 includes an externally connected
RAM ІС chip for storing memory channel information.
The information is retained by a lithium backup battery.
When the backup battery is exhausted, the transceiver
transmits and receives normally but the transceiver cannot
retain memory information.
if the transceiver becomes dusty or dirty, wipe it clean
with a dry, soft cloth. Avoid the use of strong cleaning
agents such as benzine or alcohol as they may damage the
surfaces of the transceiver.
current is 3 uA. Therefore, the battery life is:
180 mAh = 3 uA
6000 hours (= 2500 days)
approx. 6 years
Battery life
Actually, typical current value is less than 0.5 uA
when the battery is connected to the LOGIC circuit
in the ІС-765 under normal conditions.
180 mAh + 0.5 uA
360000 hours (= 15000 days)
approx. 41 years
Battery life
When the transceiver is turned ON, the lithium
battery is deactivated. Therefore, the more you
operate your 1C-765, the longer the life of the
lithium battery will be. In a way, the 1C-765 gets
stronger the more you operate it.