參數(shù)資料
型號(hào)： 20-101-1197
廠商： Rabbit Semiconductor
文件頁數(shù)： 71/168頁
文件大?。?/td> 0K
描述： MODULE RABBITCORE RCM3910 ROHS
標(biāo)準(zhǔn)包裝： 1
系列： RabbitCore®
模塊/板類型： MPU 核心模塊
適用于相關(guān)產(chǎn)品： RCM3910
RabbitCore RCM3900 User’s Manual
162
A lithium battery with a nominal voltage of 3 V and a minimum capacity of 165 mAh is
recommended. A lithium battery is strongly recommended because of its nearly constant
nominal voltage over most of its life.
The drain on the battery by the RCM3900 is typically 6 A when no other power is sup-
plied. If a 235 mAh battery is used, the battery can last about 4.5 years:
The actual battery life in your application will depend on the current drawn by components
not on the RCM3900 and the storage capacity of the battery. The RCM3900 does not drain
the battery while it is powered up normally.
Cycle the main power off/on after you install a backup battery for the first time, and when-
ever you replace the battery. This step will minimize the current drawn by the real-time
clock oscillator circuit from the backup battery should the RCM3900 experience a loss of
main power.
NOTE: Remember to cycle the main power off/on any time the RCM3900 is removed
from the Prototyping Board or motherboard since that is where the backup battery
would be located.
Rabbit’s Technical Note TN235, External 32.768 kHz Oscillator Circuits, provides addi-
tional information about the current draw by the real-time clock oscillator circuit.
D.1.2 Battery-Backup Circuit
Figure D-2 shows the battery-backup circuit.
Figure D-2. RCM3900 Backup Battery Circuit
The battery-backup circuit serves three purposes:
It reduces the battery voltage to the SRAM and to the real-time clock, thereby limiting
the current consumed by the real-time clock and lengthening the battery life.
It ensures that current can flow only out of the battery to prevent charging the battery.
A voltage, VOSC, is supplied to U5, which keeps the 32.768 kHz oscillator working
when the voltage begins to drop.
235 mAh
6 A
------------------------
4.5 years.
=
VRAM
150 kW
R74
VBAT-EXT
External Battery
R10
47 kW
VOSC
D61
R75
100 W
C8
100 nF
C9
10 nF
C4
10 nF
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