This TI reference design provides a low-component-count, low-cost solution for a 4 to 20mA loop-powered resistance temperature detector (RTD) temperature transmitter. The design utilizes the on-chip smart analog combination module in the MSP430FR2355 MCU to control the loop current, thus eliminating the need for a separate DAC. The design achieves 12-bit output resolution and 6µA output current resolution. The design incorporates reverse polarity protection as well as IEC61000-4-2 and IEC61000-4-4 protection on the loop power input.
Blockdiagram
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