参数资料
| 型号： | 101-0411 |
| 厂商： | Rabbit Semiconductor |
| 文件页数： | 72/90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 |
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70
Intellicom (OP6600/OP6700)
Figure C-4. VRAM Switch
Transistor Q3 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 Intellicom is not resetting (pin 2 on U4 is high), the /RES line will be high. This
turns on Q4, causing its collector to go low. This turns on Q3, allowing VRAM to nearly
equal Vcc.
When the Intellicom is resetting, the /RES line will go low. This turns off Q3 and Q4, pro-
viding an isolation between Vcc and VRAM.
The battery-backup circuit keeps VRAM from dropping below 2 V.
C.2.3 Reset Generator
The Intellicom uses a reset generator, U2, 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.
C.2.4 Replacing the Backup-Battery Board
The pluggable backup-battery board makes it easy to replace the backup battery with a
fresh backup battery on another backup battery board. Before replacing the backup-battery
board, make sure that the Intellicom is receiving power from the standard power supply.
This makes sure that data in RAM are not lost when the battery-backup board is removed
temporarily.
To replace the backup-battery board, remove the screw and unplug the old battery board as
shown in Figure C-5.
FDV302P
Q3
R23
R25
R24
VRAM
VCC
Q4
MMBT3904
22 kW
0 W
/RES
10 kW
相关PDF资料 |
PDF描述 |
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| AT24C02A-10PI-2.7 | IC EEPROM 2KBIT 400KHZ 8DIP |
| AT24C02A-10PI-1.8 | IC EEPROM 2KBIT 400KHZ 8DIP |
| 25FMN-BMT-A-TF | CONN FMN HSNG 25POS SNGL NOR SMD |
| 046239012001800+ | CONN FPC ONE-TOUCH LCK .5MM 12 |
| AT24C01-10PI-1.8 | IC EEPROM 1KBIT 400KHZ 8DIP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 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: |
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