and it is not referenced t" />
參數(shù)資料
型號: 20-101-1132
廠商: Rabbit Semiconductor
文件頁數(shù): 78/134頁
文件大?。?/td> 0K
描述: MODULE RCM4210 RABBITCORE
產(chǎn)品培訓(xùn)模塊: WiFi Authentication
標(biāo)準(zhǔn)包裝: 1
系列: RabbitCore®
模塊/板類型: MPU 核心模塊
適用于相關(guān)產(chǎn)品: RCM4210
其它名稱: 316-1125
42
RabbitCore RCM4200
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 J2 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 J2 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
相關(guān)PDF資料
PDF描述
20-101-1094 MCU RCM4000 RABBITCORE
345-030-540-802 CONN CARDEDGE 30POS .100 X .200
305-030-500-202 CONN CARDEDGE 30POS .156 X .140
243-002-542-101 MINI CARD EDGE 0.2" - 2PIN 1ROW
20-101-1217 MODULE RABBITCORE RCM3229
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
20-101-1136 功能描述:射頻模塊 RF Module Interface RoHS:否 制造商:Linx Technologies 產(chǎn)品:Transceiver Modules 頻帶:902 MHz to 928 MHz 輸出功率:- 15.5 dBm to + 12.5 dBm 接口類型:UART 工作電源電壓:- 0.3 VDC to + 5.5 VDC 傳輸供電電流:38.1 mA 接收供電電流:22.7 mA 天線連接器類型:U.FL 最大工作溫度:+ 85 C 尺寸:1.15 mm x 0.63 mm x 0.131 mm
20-101-1138 功能描述:模塊化系統(tǒng) - SOM RCM4300 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
20-101-1139 功能描述:模塊化系統(tǒng) - SOM RCM4310 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
20-101-1140 功能描述:WiFi/802.11模塊 RCM4400W CORE MODULE Wi-Fi/802.11 RoHS:否 制造商:Taiyo Yuden 支持協(xié)議:802.11 b/g/n 頻帶: 數(shù)據(jù)速率:150 Mbps 接口類型:SDIO 傳輸功率(最大): 天線連接器類型: 工作電源電壓:3.4 V to 5.5 V 傳輸供電電流: 接收供電電流: 最大工作溫度:+ 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 產(chǎn)品:BeagleBone LCD4 Boards 用于:BeagleBone - BB-Bone - Open Source Development Kit