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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

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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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