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The Development of a Highly Integrated Secondary Instrument

In order to simplify the design of secondary instrument, a highly integrated scheme based on MSP430F169 was put forward in the paper. On analysis of the functional requirement for process parameter measurement and control systems, signal conditioning circuits to deal with the thermal resistance, thermocouple, current and pulse input or output was designed to meet the demand of different field. The MCU on-chip resources were used in the design as far as possible. It mainly includes the use of A/D and pulse counter to acquire signal, D/A to output current and UART to construct communication. Furthermore the clock and EEPROM storage systems were designed to enlarge the universal property. Tests show that the platform can meet the hardware demand of the mainstream secondary instrument, and is with high performance cost ratio.