Atomic Force Microscope Data Acquisition And Output Control System Based On ARM

The atomic force microscope is a kind of surface analysis, atomic elementsmanipulation, nano-processing and manufacturing instrument, which is widely usedin physics, chemistry, life sciences, mechanics, information storage,nanotechnology and other fields. According to the working principle of the atomicforce microscope, a data acquisition and feedback control system is designed basedon ARM processor in this paper, which can be used for atomic force microscopy.The S3C2440of ARM9series is adopted as the processor. The16-bit6-channel simultaneous sampling AD chip ADS8556is used to realize real-time,high-speed, high precision,3-channel, synchronized data acquisition of the positivepressure signal, friction signal, and total signal strength of atomic force microscope.The16-bit4-channel DA chip DAC8574is used to achieve real-time, high-speed,high precision,3-channel, synchronized digital-analog conversion output of X,Y,Zscanning signals of atomic force microscope. For extension application andfunctional needs, the necessary peripheral circuit is designed, including powersupply circuit, reset circuit, USB interface, serial interface, Ethernet interface, TAGinterface, LCD screen interface, keyboard circuit, etc. The PCB is produced andwelded to complete the entire hardware design.Test software of AD based on SPI bus and DA based on I2C bus areprogrammed in the ADS1.2integrated development environment. The results ofsoftware test show that ADS8556and DAC8574work properly under the control ofthe S3C2440. The circuit designed in this paper provides a hardware platform forintegrated application of atomic force microscope, and it can be used as a common,independent data acquisition and data output hardware platform.