参数资料
| 型号： | 101-0405 |
| 厂商： | Rabbit Semiconductor |
| 文件页数： | 66/80页 |
| 文件大小： | 0K |
| 描述： | MODULE RABBITCORE RCM2010 |
| 标准包装： | 1 |
| 系列： | RabbitCore® |
| 模块/板类型： | MPU 核心模块 |
| 适用于相关产品： | RCM2010 |
| 其它名称： | 316-1009 |
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User’s Manual
65
C.1.3 Power to VRAM Switch
The VRAM switch, shown in Figure C-3, allows a customer-supplied external 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-3. VRAM Switch
Transistor Q11 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 RCM2000 is not resetting (pin 2 on U10 is high), the /RES_OUT line will be
high. This turns on Q10, causing its collector to go low. This turns on Q11, allowing
VRAM to nearly equal Vcc.
When the RCM2000 is resetting, the /RES_OUT line will go low. This turns off Q10 and
Q11, providing an isolation between Vcc and VRAM.
The battery-backup circuit keeps VRAM from dropping below 2 V.
C.1.4 Reset Generator
The RCM2000 uses a reset generator, U10, to reset the Rabbit 2000 microprocessor when
the voltage drops below the voltage necessary for reliable operation. The reset occurs
between 4.50 V and 4.75 V, typically 4.63 V. The RCM2000 has a reset output, pin 37 on
header J3, presented to the headers. The reset generator has a reset input, pin 38 on header
J3, that can be used to force the RCM2000 to reset.
FDV302P
Q11
R15
R16
VRAM
VCC
Q10
MMBT3904
22 kW
/RES_OUT
10 kW
相关PDF资料 |
PDF描述 |
|---|---|
| 101-0404 | MODULE RABBITCORE RCM2000 |
| 006200505130000+ | CONN FFC/FPC 5POS 1MM R/A SMD |
| 006208505110000 | CONN FFC/FPC 5POS 1MM ZIF SMD |
| 006208505110000+ | CONN FFC/FPC 5POS 1MM ZIF SMD |
| 395-030-541-204 | CARD EDGE 30POS DL .100X.200 BLK |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 101-0406 | 功能描述:开发板和工具包 - 其他处理器 Cloning Board RoHS:否 制造商:Freescale Semiconductor 产品:Development Systems 工具用于评估:P3041 核心:e500mc 接口类型:I2C, SPI, USB 工作电源电压: |
| 1010-406 | 制造商:MISCELLANEOUS 功能描述: |
| 101-040600-14 | 制造商:Distributed By MCM 功能描述:RJ11 PLUGS STRANDED FLAT WIREPK10 |
| 101-040600-24 | 制造商:Distributed By MCM 功能描述:RJ11 PLUGS SOLID FLAT WIRE PK10 |
| 101-040610-14 | 制造商:Distributed By MCM 功能描述:RJ11 PLUGS STRANDEDROUND WIRE PK10 |
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