Gas meters require monitoring of various sensor information to measure gas usage and to safely supply gas, an LCD display function to show this information and a data communication function to communicate with external devices. Also, these functions must stably operate with limited battery capacity for the period specified.

To support various LCD panels, Renesas offers a lineup of RL78/L1x microcontrollers (MCUs) which support three LCD drive voltage generation methods (external resistance division method, internal voltage boosting method and capacitor split method). In addition, Renesas offers the RL78/H1D MCUs which are equipped with UART and can communicate up to 19200bps with subsystem clock (38.4kHz), sampling output timer/detector function suitable for rotation detection by magnetoresistive (MR) sensor, and is suitable for diaphragm gas meter construction.

Gas Meter

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Block Semiconductor Device Recommended Products Features
Main Controller MCU RL78/L1x 32MHz, 16-bit, true low power, on-chip LCD controller/driver
RL78/H1D 32MHz, 16-bit, true low power, on-chip LCD controller/driver, on-chip timer for MR sensor
Communication Sub-GHz RF Transceiver RAA604S00 RF frequency range: 863MHz to 928MHz, IEEE802.15.4g / 4e compliant hardware function
MCU Built-in Sub-GHz RF Transceiver RL78/G1H 32MHz, 16-bit CPU, RF frequency range: 864MHz to 928MHz

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