參數(shù)資料
型號(hào)： 101-0497
廠商： Rabbit Semiconductor
文件頁(yè)數(shù)： 72/110頁(yè)
文件大?。?/td> 0K
描述： MODULAR RABBIT CORE OP6810
標(biāo)準(zhǔn)包裝： 1
系列： RabbitCore®
模塊/板類(lèi)型： 單板計(jì)算機(jī)模塊
適用于相關(guān)產(chǎn)品： OP6810
其它名稱(chēng)： Q1912584
60
MiniCom (OP6800)
B.2 Batteries and External Battery Connections
The SRAM and the real-time clock have provision for battery backup. Power to the SRAM
and the real-time clock (VRAM) is provided by two different sources, depending on whether
the main part of the OP6800 is powered or not. When the OP6800 is powered normally, and
Vcc is within operating limits, the SRAM and the real-time clock are powered from Vcc. If
power to the board is lost or falls below 4.63 V, the VRAM and real-time clock power must
come from a backup battery in your system which you would connect to pin 40 of header J1
on the OP6800 via the ribbon cable. The backup battery should be able to supply 2.85 V–
3.15 V at 10
A.
The reset generator circuit controls the source of power by way of its /RESET output signal.
B.2.1 Battery-Backup Circuit
Figure B-1 shows the battery-backup circuit located on the OP6800 module.
Figure B-1. OP6800 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 U6, which keeps the 32.768 kHz oscillator working
when the voltage begins to drop.
VRAM and Vcc are nearly equal (<100 mV, typically 10 mV) when power is supplied to
the OP6800.
R38
10 kW
VRAM
External Battery
VBAT
R41
47 kW
2 kW
R39
RT1
22 kW
VBAT
Vcc
22 kW
R37
47 kW
VOSC
R36
D1
D3
D2
T
thermistor
J1:40
C17
10 nF
C27
10 nF
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