参数资料
型号: 101-0411
厂商: Rabbit Semiconductor
文件页数: 71/90页
文件大小: 0K
描述: INTERFACE 12KEYDISP ETHNT OP6700
标准包装: 25
系列: SBC
模块/板类型: 单板计算机模块
适用于相关产品: OP6700
User’s Manual
69
Figure C-3 shows the battery-backup circuitry on the Intellicom board.
Figure C-3. Intellicom Battery-Backup 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 U13, 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 Intellicom. VRAM is also available on pin 34 of header J2 to facilitate battery backup
of the external circuit. Note that the recommended minimum resistive load at VRAM is
100 k
, and new battery life calculations should be done to take external loading into
account.
C.2.2 Power to VRAM Switch
The VRAM switch, shown in Figure C-4, allows the battery backup to provide power
when the external power goes off. The switch provides an isolation between Vcc and the
battery when Vcc goes low. This prevents the Vcc line from draining the battery.
R36
8.2 kW
VRAM
VBAT-EXT
External Battery
R37
47 kW
2 kW
R35
R39
22 kW
VBAT
Vcc
22 kW
R38
22 kW
U13
pin 5
R34
D4
D2
D3
T
thermistor
C16
1 nF
C15
1 nF
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相关代理商/技术参数
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10104110 制造商:FCI-CONNECTOR 制造商全称:FCI connector 功能描述:MICRO USB B TYPE RECEPTACLE
10104110-0001LF 功能描述:USB接头 5P Quick Connect Micro USB TypeB Rcpt RoHS:否 制造商:FCI 产品:USB Type A Connectors 标准:USB 3.0 端口数量: 位置/触点数量:9 型式:Female 电流额定值:1.8 A 安装风格:Through Hole 端接类型:Solder Pin 连接器类型:USB 3.0 Receptacle
10104110-0001LF 制造商:FCI 功能描述:MICRO USB B, RECEPTACLE, 5POS, SMT RT AN
10-104-11-01 制造商:Concord Electronics Inc 功能描述:Contact Solder ST Thru-Hole
10-104-11-03 制造商:Concord Electronics Inc 功能描述: