参数资料
型号: 101-0814
厂商: Rabbit Semiconductor
文件页数: 87/94页
文件大小: 0K
描述: COMPUTER SNG BD BL1810 512K SRAM
标准包装: 10
系列: SBC
模块/板类型: 单板计算机模块
适用于相关产品: BL1810
84
Jackrabbit (BL1800)
The battery-backup circuit serves two purposes:
It reduces the battery voltage to the real-time clock, thereby reducing the current con-
sumed 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.
C.2.2 Power to VRAM Switch
The VRAM switch, shown in Figure C-6, allows the soldered-in battery 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.
Figure C-6. VRAM Switch
Transistor Q23 is needed to provide a very small voltage drop between Vcc and VRAM
(<100 mV, typically 10 mV) so that the processor lines powered by Vcc will not have a
significantly different voltage than VRAM.
When the Jackrabbit is not resetting (pin 2 on U21 is high), the /RES line will be high.
This turns on Q24, causing its collector (pin 3) to go low. This turns on Q23, allowing
VRAM to nearly equal Vcc.
When the Jackrabbit is resetting, the /RES line will go low. This turns off Q23 and Q24,
providing an isolation between Vcc and VRAM.
The battery backup circuit keeps VRAM from dropping below 2 V.
C.2.3 Reset Generator
The Jackrabbit uses a reset generator, U21, to reset the Rabbit 2000 microprocessor when
the voltage drops below the voltage necessary for reliable operation. The Jackrabbit does
not have a reset output presented to the headers. The reset generator has a reset input that
can be used to force the Jackrabbit to reset. This input is available on headers J3 and J5,
and also on pads directly below header J5. The two pads allow a screwdriver to be used to
short the pads, forcing a reset.
FDV302P
Q23
R43
R46
R45
10 kW
VRAM
VCC
Q24
MMBT3904
22 kW
0 W
/RES
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101-0815 功能描述:单板计算机 SR9100 512K SRAM RoHS:否 制造商:Ampro By ADLINK 外观尺寸:EPIC 处理器类型:Intel Atom D510 频率:1.66 GHz 存储容量:2 GB (max) 存储类型:DDR2, L2 Cache 接口类型:Ethernet, PS/2, SATA, Serial, USB 工作电源电压:5 V, 12 V 功耗:13 W 最大工作温度:+ 70 C 尺寸:165.1 mm x 114.3 mm
101-0816 功能描述:KIT DEV RABBITCORE TCP/IP 2000 RoHS:否 类别:编程器,开发系统 >> 过时/停产零件编号 系列:* 标准包装:1 系列:- 类型:MCU 适用于相关产品:Freescale MC68HC908LJ/LK(80-QFP ZIF 插口) 所含物品:面板、缆线、软件、数据表和用户手册 其它名称:520-1035
101-0817 功能描述:单板计算机 BL2030 512K SRAM RoHS:否 制造商:Ampro By ADLINK 外观尺寸:EPIC 处理器类型:Intel Atom D510 频率:1.66 GHz 存储容量:2 GB (max) 存储类型:DDR2, L2 Cache 接口类型:Ethernet, PS/2, SATA, Serial, USB 工作电源电压:5 V, 12 V 功耗:13 W 最大工作温度:+ 70 C 尺寸:165.1 mm x 114.3 mm
101-0818 功能描述:单板计算机 BL2100 Fric Lk 512K RoHS:否 制造商:Ampro By ADLINK 外观尺寸:EPIC 处理器类型:Intel Atom D510 频率:1.66 GHz 存储容量:2 GB (max) 存储类型:DDR2, L2 Cache 接口类型:Ethernet, PS/2, SATA, Serial, USB 工作电源电压:5 V, 12 V 功耗:13 W 最大工作温度:+ 70 C 尺寸:165.1 mm x 114.3 mm
101-0820 功能描述:COMPUTER SGL-BD BL2000 SRAM/FLSH RoHS:否 类别:集成电路 (IC) >> 嵌入式 - 微控制器或微处理器模块 系列:SBC 产品目录绘图:DLP-245SY-G 标准包装:1 系列:USB 模块/板类型:开发板 适用于相关产品:USB 其它名称:813-1006