參數(shù)資料
型號： 101-1087
廠商： Rabbit Semiconductor
文件頁數(shù)： 47/164頁
文件大?。?/td> 0K
描述： MODULE RABBITCORE RCM 3365
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： RCM3365
134
RabbitCore RCM3365/RCM3375
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 RCM3365/RCM3375 is typically 6 A when no other power
is supplied. If a 165 mAh battery is used, the battery can last about 3 years:
The RCM3365/RCM3375 module does not drain the battery while it is powered up
normally.
Cycle the main power off/on on the RCM3365/RCM3375 after you install a backup battery
for the first time, and whenever you replace the battery. This step will minimize the current
drawn by the real-time clock oscillator circuit from the backup battery should the
RCM3365/RCM3375 experience a loss of main power.
NOTE: Remember to cycle the main power off/on any time the RCM3365/RCM3375 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. RCM33365/RCM3375 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 U1, which keeps the 32.768 kHz oscillator working
when the voltage begins to drop.
165 mAh
6 A
------------------------
3.1 years.
=
VRAM
150 kW
R46
VBAT-EXT
External Battery
R7
47 kW
VOSC
D1
R3
100 W
C2
100 nF
C5
10 nF
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