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参数资料
型号： 20-101-1138
厂商： Rabbit Semiconductor
文件页数： 62/124页
文件大小： 0K
描述： RCM4300 RABBITCORE
产品培训模块： WiFi Authentication
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： RCM4300
其它名称： 316-1141
RabbitCore RCM4300 User’s Manual
42
If a device such as a battery is
connected across two channels
for a differential measurement,
and it is not referenced to
analog ground, then the current
from the device will flow
through both sets of attenuator
resistors without flowing back
to analog ground as shown in
Figure 11. This will generate a
negative voltage at one of the
inputs, LN1, which will almost
certainly lead to inaccurate A/D
conversions. To make such differential measurements, connect the R1 resistors to the A/D
converter’s internal reference voltage, which is software-configurable for 1.15 V, 2.048 V,
or 2.5 V. This internal reference voltage is available on pin 49 of header J3 as VREF, and
allows you to convert analog input voltages that are negative with respect to analog ground.
NOTE: The amplifier inside the A/D converter’s internal voltage reference circuit has a
very limited output-current capability. The internal buffer can source up to 20 mA and
sink only up to 200 A. Use a separate buffer amplifier if you need to supply any load
current.
The A/D converter’s CONVERT pin is available on pin 48 of header J3 and can be used as
a hardware means of forcing the A/D converter to start a conversion cycle at a specific time.
The CONVERT signal is an edge-triggered event and has a hold time of two CCLK periods
for debounce.
A conversion is started by an active (rising) edge on the CONVERT pin. The CONVERT
pin must stay low for at least two CCLK periods before going high for at least two CCLK
periods. Figure 12 shows the timing of a conversion start. The double falling arrow on
CCLK indicates the actual start of the conversion cycle.
Figure 12. Timing Diagram for Conversion Start Using CONVERT Pin
Appendix B explains the implementation examples of these features on the Prototyping
Board.
Figure 11. Current Flow from Ungrounded
or Floating Source
R0
2.2 nF
R1
2.2 nF
ADC
AIN0
AIN1
+
I
LN0
LN1
+
-
Device
CCLK
BUSY
CONV
Conversion starts
相关PDF资料
PDF描述
305-030-521-201 CONN CARDEDGE 30POS .156 GREEN
20-101-1051 MODULE RABBITCORE RCM3365
305-030-520-204 CONN CARDEDGE 30POS .156 GREEN
20-101-1196 MODULE RABBITCORE RCM3900
20-101-1105 MODULE RCM4100 RABBITCORE
相关代理商/技术参数
参数描述
20-101-1139 功能描述:模块化系统 - SOM RCM4310 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
20-101-1140 功能描述:WiFi/802.11模块 RCM4400W CORE MODULE Wi-Fi/802.11 RoHS:否 制造商:Taiyo Yuden 支持协议:802.11 b/g/n 频带: 数据速率:150 Mbps 接口类型:SDIO 传输功率（最大）: 天线连接器类型: 工作电源电压:3.4 V to 5.5 V 传输供电电流: 接收供电电流: 最大工作温度:+ 80 C 尺寸:35 mm x 15 mm x 2.9 mm
20-101-1153 功能描述:子卡和OEM板 RCM4300 Proto board RoHS:否 制造商:BeagleBoard by CircuitCo 产品:BeagleBone LCD4 Boards 用于:BeagleBone - BB-Bone - Open Source Development Kit
20-101-1154 功能描述:模块化系统 - SOM RCM4120 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
20-101-1170 功能描述:Zigbee/802.15.4模块 RCM4510W CORE MODULE RoHS:否 制造商:Digi International 频带:902 MHz to 928 MHz 视线范围: 数据速率: 灵敏度: 工作电源电压:2.4 V to 3.6 V 传输供电电流:215 mA 接收供电电流:26 mA 输出功率:250 mW 天线连接器类型:Wire 最大工作温度:+ 85 C 尺寸:32.94 mm x 22 mm x 2.03 mm
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