Data-acquisition circuit measures everything


Posted on Jun 3, 2012

Using a product developed for PC-motherboard environmental monitoring, you can configure a low-cost, general-purpose DAS (data-acquisition system) (Figure 1). The DAS can directly monitor multiple voltage channels as well as temperature and frequency. It can also directly monitor digital sensors. Using only a few additional components, the system can accommodate other sensor and transducer elements. The flexibility exists to expand the scheme to cover additional input channels if necessary. For voltage sensing, the ADM9240 contains a multichannel ADC that can directly monitor as many as six input channels.



The original intent of the ADC was to monitor power supplies on PC motherboards, but the converter is flexible enough for general-purpose use. The maximum input-voltage ranges for the channels are 3.3, 3.6, 4.4, 6.64, and 16V. Figure 1 shows the system mo




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