Combining Linear Technology and Analog Devices signal chain, power management, and wireless networking products enables the design of a truly wireless current sense circuit. Figure 3 shows an example implementation. The new ultralow power LTC2063 chopper op amp can accurately read small voltage drops across a sense resistor. The entire circuit, including micropower ADC and voltage reference, floats with the common mode of the sense resistor. The nanopower LTC3335 switcher can power the circuit for years from a small battery, while reporting cumulative battery usage with its built-in Coulomb counter. The LTP5901-IPM wireless module manages the entire application and automatically connects to a highly reliable SmartMesh IP network.
About the author:
Kris Lokere is Strategic Applications Manager, Signal Conditioning Products at Analog Devices – www.analog.com