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id="d49e4dcdb2d54fdf957675a0924409bb" configuration="group=IncludeSubGroups%3D%2520False%26Group%3D291%26GroupPath%3DCN%252Fdata-converters%252F%253A&label=&loadedFor=-1" /> <link type="Telligent.Evolution.Controls.SingleGroupCustomNavigationPlugin, Telligent.Evolution.Platform" id="b41edfb168a74416bc0a808b3b9e7ec0" configuration="group=IncludeSubGroups%3D%2520False%26Group%3D293%26GroupPath%3DCN%252Faudio%252F%253A&label=&loadedFor=-1" /> <link type="Telligent.Evolution.Controls.SingleGroupCustomNavigationPlugin, Telligent.Evolution.Platform" id="70271018efd7425ca857d48bec9eac78" configuration="group=IncludeSubGroups%3D%2520False%26Group%3D295%26GroupPath%3DCN%252Fade%252F%253A&label=&loadedFor=-1" /> <link type="Telligent.Evolution.Controls.SingleGroupCustomNavigationPlugin, Telligent.Evolution.Platform" id="ae23d1d15c2a48eaa37c2c6fc2607fd1" configuration="group=IncludeSubGroups%3D%2520False%26Group%3D309%26GroupPath%3DCN%252Fmems%252F%253A&label=&loadedFor=-1" /> <link type="Telligent.Evolution.Controls.SingleGroupCustomNavigationPlugin, Telligent.Evolution.Platform" id="bb5505485488493f93f81909aa1290bd" configuration="group=IncludeSubGroups%3D%2520False%26Group%3D308%26GroupPath%3DCN%252Finterface-isolation%252F%253A&label=&loadedFor=-1" /> <link type="Telligent.Evolution.Controls.SingleGroupCustomNavigationPlugin, Telligent.Evolution.Platform" id="a22ddd92893b4881a23f005368dab6dc" configuration="group=IncludeSubGroups%3D%2520False%26Group%3D310%26GroupPath%3DCN%252Fpower%252F%253A&label=&loadedFor=-1" /> <link type="Telligent.Evolution.Controls.SingleGroupCustomNavigationPlugin, Telligent.Evolution.Platform" id="c41ed681663440749639e310a7b2216f" configuration="group=IncludeSubGroups%3D%2520False%26Group%3D317%26GroupPath%3DCN%252Fadas%252F%253A&label=&loadedFor=-1" /> <link type="Telligent.Evolution.Controls.SingleGroupCustomNavigationPlugin, Telligent.Evolution.Platform" id="6a95477743444d89a984742cff1d9883" configuration="group=IncludeSubGroups%3D%2520False%26Group%3D303%26GroupPath%3DCN%252Faduc%252F%253A&label=&loadedFor=-1" /> <link type="Telligent.Evolution.Controls.SingleGroupCustomNavigationPlugin, Telligent.Evolution.Platform" id="905b590b2cad43d483a3ab432644a6b2" configuration="group=IncludeSubGroups%3D%2520False%26Group%3D299%26GroupPath%3DCN%252Fother%252F%253A&label=&loadedFor=-1" /> <link type="Telligent.Evolution.Controls.SingleGroupCustomNavigationPlugin, Telligent.Evolution.Platform" id="cc2d4f1f6b5d4d94978be9e77f48b7eb" configuration="group=IncludeSubGroups%3D%2520False%26Group%3D301%26GroupPath%3DCN%252Fother%252Fhow-to-use-engineerzone%252F%253A&label=&loadedFor=-1" /> <link type="Telligent.Evolution.Controls.GenericCustomNavigationPlugin, Telligent.Evolution.Platform" id="d0165d2729ea466897d9f27e0b5ee0bd" configuration="url=https%3A%2F%2Fanalogdevices.telligenthosting.net%2Fcn%2Fsuport-reference-library%2F&label=%E6%8A%80%E6%9C%AF%E6%94%AF%E6%8C%81%E5%8F%82%E8%80%83%E5%BA%93" /> <link type="Telligent.Evolution.Controls.SingleGroupCustomNavigationPlugin, Telligent.Evolution.Platform" id="52ad0f06ccd545498753278888414dc4" configuration="group=IncludeSubGroups%3D%2520False%26Group%3D316%26GroupPath%3DCN%252Fwebcasts%252F%253A&label=&loadedFor=-1" /> <link type="Telligent.Evolution.Controls.SingleGroupCustomNavigationPlugin, Telligent.Evolution.Platform" id="1ed785d734f042739f45516b4cf6b950" configuration="group=IncludeSubGroups%3D%2520False%26Group%3D296%26GroupPath%3DCN%252Fcampaign-center%252F%253A&label=&loadedFor=-1" /> <link type="Telligent.Evolution.Controls.SingleGroupCustomNavigationPlugin, Telligent.Evolution.Platform" id="158bea5fab224682a2f5689b60915aa7" configuration="group=IncludeSubGroups%3D%2520False%26Group%3D318%26GroupPath%3DCN%252Frewards%252F%253A&label=&loadedFor=-1" 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精密转换器专区

问答 ADAS3022转换结果回读

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ADAS3022转换结果回读

zcchunter on Dec 9, 2016

项目背景，电动汽车充电桩的检测装置，主要用来测试充电桩反馈信号的电压信号，以及充电电压及电流值。（交流电信号通过AD202与后级隔离）

硬件设计描述：

AGND，DGND，COM，AUX-，NC接地

VDDH：+14.5V

VSSH，TPAD：-14.6V

AVDD，DVDD：5.0V

VIO：3.3V

REFIN：+2.512V

测得：

RCAP，DCAP，ACAP：+2.5xxV

REF1，REF2：4.09xV

接口跟FPGA之间采用ADuM241E隔离。

软件，通过din送入配制字后，启动转换，然后读busy引脚，待busy引脚下降沿后，开始回读转换结果，采用32个时钟脉冲读取方法，目前情况是这样，回读的后16位配制字正确，正是之前写入的配制字，但是回读的前16位转换结果不对，而且将时序稍作调整，比如说调整clk高低电平宽度，（10nS最小，调整步进10nS），或者clk上升沿后稍等待10nS或者20nS后读取dout引脚的值，或者busy下降沿后等待10nS或者20nS后开始给clk信号，都会对读到的值产生很大的影响，唯一不受影响的是控制字的回读，正式之前写入的控制字。

请问出现这种情况是什么原因导致，或者调试的方向应该考虑什么因素？谢谢关注！

补充：控制字为0xF8FB（

CFG_OVERWRITE|INX_7|COM_COM|PGIA_10V24|MUX_AFE|SEQ_BASIC|TEMP_DISABLE|REFN_DISABLE|CMS_NORMAL|CHPA_NORMAL

）宏定义来自ExampleCode_ADC_ADAS3022.zip

回读内容为0x78FB

Top Replies

hpkamen Jan 5, 2017 +1 verified

可能的原因是ADum241E存在延迟，在芯片的通信过程中，由于速率过快，使得延迟大于了时钟周期，影响时序

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0 hpkamen on Jan 5, 2017 5:06 PM

可能的原因是ADum241E存在延迟，在芯片的通信过程中，由于速率过快，使得延迟大于了时钟周期，影响时序
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0 hpkamen on Jan 5, 2017 5:06 PM

可能的原因是ADum241E存在延迟，在芯片的通信过程中，由于速率过快，使得延迟大于了时钟周期，影响时序
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