Integrated circuits used in today’s water and gas meters are supplied by batteries, and thus low power consumption is a key factor in their selection. At ST they offer a wide portfolio of high-performance ultra-low power 8- and 32-bit microcontrollers, and RF transceiver (including Wireless MBUS stacks) and high-efficient power supply devices to meet your design needs.
Source: http://www.st.com/en/applications/internet-of-things-iot/water-gas-meter.html
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