Study Of Mass Storage Data Acquisition System Based On USB Host And ARM

Data acquisition is reposeful the conversion the all signal of outside and field objectives by kinds of sensors, which is physical signal, chemical signal, and biological signal and so on. Then the signal is processed or recorded by the microcontrollers after signal modulation, signal sampling, quantization, coding and transferring. Data acquisition is the bridge to linking up analog word and digital word.With the fast development and widely application of computer technology and digital signal process technology, data acquisition system (DAS) is more widely applied in more fields, where the widely application of the constantly emerging electronic technology and achievements into data acquisition field, such as new high-performance and low-power device, high-performance microprocessor, etc, the DAS is stronger and more powerful than before. And fast development of computer technology has settled solid foundation for the thing that DAS realizes intelligent and microminiaturization.The high-demand to all index of DAS have been put forward, while it is more and more widely applied. Take DAS discussed in this paper for example, the 16 bit resolution, 45KSPS throughout, 20G to 40G data storage are required, meanwhile the powerful process software is also needed.Therefore the DAS in this paper adopts the 16-bit, 250KSPS analog-to-digital converter for converting analog signal to digital signal, adopts the mass storage data solution based on embedded USB Host technology for storage the digital signal into mobile hard-disk, adopts high-performance ARM processor for intelligently controlling data conversion and data storage and develops the process software by Lab VIEW language for analyzing and processing the data which stored in the mobile hard-disk.The mass storage DAS based on USB Host and ARM technology is already completed and put into actual application. And the application fully proves that all setting index of the DAS is reached. Because of its high-performance and lower-cost, the DAS can be not only a common data acquisition system, but also can be apparatus of virtual instruments such as digital spectral analyzer and so on.If the functions already realized could be improved or some new functions could be realized such as USB OTG, human-computer interaction interface, data acquisition system will have perfect performance; more powerful functions, more convenient operation and stronger ability of data processing.