参数资料
| 型号： | 101-0558 |
| 厂商： | Rabbit Semiconductor |
| 文件页数： | 87/94页 |
| 文件大小： | 0K |
| 描述： | COMPUTER SNG BD BL1800 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： | BL1800 |
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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
相关PDF资料 |
PDF描述 |
|---|---|
| 396-036-526-204 | CARD EDGE 36POS DL .125X.250 BLK |
| 396-036-526-202 | CARD EDGE 36POS DL .125X.250 BLK |
| 101-0411 | INTERFACE 12KEYDISP ETHNT OP6700 |
| AT24C02A-10PI-2.7 | IC EEPROM 2KBIT 400KHZ 8DIP |
| AT24C02A-10PI-1.8 | IC EEPROM 2KBIT 400KHZ 8DIP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 10105584 | 制造商:Amphenol Corporation 功能描述:10-341374-222 - Bulk |
| 101055OO | 制造商:TE Connectivity 功能描述: |
| 101056084S | 制造商:Amphenol Aerospace 功能描述:CONNECTOR |
| 101-0561 | 功能描述:模块化系统 - SOM RCM3400 RABBITCORE RoHS:否 制造商:Digi International 外观尺寸:ConnectCore 9P 处理器类型:ARM926EJ-S 频率:150 MHz 存储容量:8 MB, 16 MB 存储类型:NOR Flash, SDRAM 接口类型:I2C, SPI, UART 工作电源电压:3.3 V 最大工作温度:+ 85 C 尺寸:1.97 in x 1.97 in x 6.1 in |
| 10-105610-02S | 制造商:Amphenol Aerospace 功能描述:PLUG |
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