参数资料
| 型号： | 20-101-0435 |
| 厂商： | Rabbit Semiconductor |
| 文件页数： | 89/100页 |
| 文件大小： | 0K |
| 描述： | MODULE RABBITCORE RCM2110 |
| 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： | RCM2110 |
| 产品目录页面： | 620 (CN2011-ZH PDF) |
| 其它名称： | 316-1086 |
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User’s Manual
83
VRAM is also available on pin 29 of header J2 to facilitate battery backup of the external
circuit. Note that the recommended maximum external current draw from VRAM is 100 A,
and new battery-life calculations should be done to take external loading into account.
C.1.2 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 Q2 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 RCM2100 is not resetting (pin 2 on U3 is high), the /RESET line will be high.
This turns on Q3, causing its collector to go low. This turns on Q2, allowing VRAM to
nearly equal Vcc.
When the RCM2100 is resetting, the /RESET line will go low. This turns off Q2 and Q3,
providing an isolation between Vcc and VRAM.
The battery-backup circuit keeps VRAM from dropping below 2 V.
C.1.3 Reset Generator
The RCM2100 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. The RCM2100 has a reset output, pin 33 on
header J2. The reset generator has a reset input, pin 34 on header J2, that can be used to
force the RCM2100 to reset.
FDV302P
Q2
R15
R14
VRAM
VCC
Q3
MMBT3904
22 kW
/RESET
10 kW
相关PDF资料 |
PDF描述 |
|---|---|
| 345-030-527-801 | CARDEDGE 30POS DUAL .100 GREEN |
| AT25640N-10SI-2.7 | IC EEPROM 64KBIT 3MHZ 8SOIC |
| 345-030-527-204 | CARDEDGE 30POS DUAL .100 GREEN |
| AT25640-10PI-2.7 | IC EEPROM 64KBIT 3MHZ 8DIP |
| 345-030-527-202 | CARDEDGE 30POS DUAL .100 GREEN |
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| 20-101-0436 | 功能描述:模块化系统 - SOM RCM2120 RabbitCore Module 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 |
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| 20-101-0444 | 功能描述:子卡和OEM板 SR9320 A/D 4-20mA RoHS:否 制造商:BeagleBoard by CircuitCo 产品:BeagleBone LCD4 Boards 用于:BeagleBone - BB-Bone - Open Source Development Kit |
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