Psoc 5lp SAR ADC故障

你好。
我描述的问题发生在CY8C5267AXI-LP051处理器上。我使用自由运行的12位ADC SAR用模拟2输入多路复用器捕获2个模拟信号。采集系统用一个定时器组织，每50微秒产生一个中断。在每个中断处，开始ADCZAR SAR，并在转换结束时存储结果，最后选择下一个信道用于在新中断处获取。该系统工作正常，至少两个星期，然后逐步，ADCSAR失败。碰巧，不管ADC转换的输入是多少，即使模拟信号的值为零，结果也变为常数（例如799）。这个问题是系统的，在5个设备上测试延长工作时间，在至少2周的紧张工作之后都有同样的问题。你能给我一个解释和一个可能的解决方案吗？我附上ADCYSAR的配置图像和通常获取的模拟信号的典型图像。
吉安卡洛



     以下为原文
  Hello.
I describe the problem that happens with the CY8C5267AXI-LP051 processor.
I use the free-running 12-bit ADC SAR to capture 2 analog signals with an analog 2-input multiplexer. The acquisition system is organized with a timer that generates an interrupt every 50 micro seconds. At each interrupt the ADC_SAR is started and at the end of the conversion the result is memorized and finally the next channel is selected for acquisition at the new interrupt. The system works correctly for at least a couple of weeks, then progressively, the ADC_SAR fails. It happens that, regardless of which input the ADC converts, the result becomes a constant number (eg 799), even if the value of the analog signal is zero. This problem is systematic, on 5 devices tested for prolonged working time all after at least 2 weeks of intense work have the same problem. Can you give me an explanation and a possible solution? I enclose the images of the configuration of the ADC_SAR and a typical image of the analog signals that are normally acquired.
Greetings
Giancarlo