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參數(shù)資料
| 型號： | 20-101-0356 |
| 廠商： | Rabbit Semiconductor |
| 文件頁數(shù)： | 87/94頁 |
| 文件大?。?/td> | 0K |
| 描述： | COMPUTER SINGLE-BOARD BL1800 |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | Jackrabbit |
| 模塊/板類型： | 單板計算機模塊 |
| 適用于相關(guān)產(chǎn)品： | BL1800 |
| 產(chǎn)品目錄頁面： | 618 (CN2011-ZH PDF) |
| 其它名稱： | 316-1079 |
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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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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 20-101-0357 | 功能描述:單板計算機 BL1810 SINGLE BOARD COMPUTER RoHS:否 制造商:Ampro By ADLINK 外觀尺寸:EPIC 處理器類型:Intel Atom D510 頻率:1.66 GHz 存儲容量:2 GB (max) 存儲類型:DDR2, L2 Cache 接口類型:Ethernet, PS/2, SATA, Serial, USB 工作電源電壓:5 V, 12 V 功耗:13 W 最大工作溫度:+ 70 C 尺寸:165.1 mm x 114.3 mm |
| 20-101-0358 | 功能描述:單板計算機 BL1820 RoHS:否 制造商:Ampro By ADLINK 外觀尺寸:EPIC 處理器類型:Intel Atom D510 頻率:1.66 GHz 存儲容量:2 GB (max) 存儲類型:DDR2, L2 Cache 接口類型:Ethernet, PS/2, SATA, Serial, USB 工作電源電壓:5 V, 12 V 功耗:13 W 最大工作溫度:+ 70 C 尺寸:165.1 mm x 114.3 mm |
| 20-101-0383 | 功能描述:模塊化系統(tǒng) - SOM RCM2020 RabbitCore RoHS:否 制造商:Digi International 外觀尺寸:ConnectCore 9P 處理器類型:ARM926EJ-S 頻率:150 MHz 存儲容量:8 MB, 16 MB 存儲類型:NOR Flash, SDRAM 接口類型:I2C, SPI, UART 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 尺寸:1.97 in x 1.97 in x 6.1 in |
| 20-101-0389 | 功能描述:子卡和OEM板 SR9200 16IN/8OUT RoHS:否 制造商:BeagleBoard by CircuitCo 產(chǎn)品:BeagleBone LCD4 Boards 用于:BeagleBone - BB-Bone - Open Source Development Kit |
| 20-101-0390 | 功能描述:子卡和OEM板 SR9210 8 in/ 16 out RoHS:否 制造商:BeagleBoard by CircuitCo 產(chǎn)品:BeagleBone LCD4 Boards 用于:BeagleBone - BB-Bone - Open Source Development Kit |
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