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Data_acquisition_IC_with_4_wire_microprocessor_interface

2016-10-16 19:36  
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Data_acquisition_IC_with_4_wire_microprocessor_interface
This circuit shows the basic interface connections between an 8-input LTC1090 data-acquisition IC and an Intel 8051 microprocessor.The 4-wlre serial interface includes chip-select CS, shift clock SCLK for synchronizing data bits, a data input DIN and a data output, DOUT. Data bits are transmitted and received simultaneously (full duplex), minimizing the transfer time. The external ACLK input controls the conversion rate, and can be tied to the SCLK, as shown, or can be derived from the system clock (the 8051 ALE pin), or it can be run asynchronously. When the ACLK pin is driven at 2 MHz, the conversion time is 22 μs. Consult the LTC1090 datasheet for further data.