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 the RL78/L1x microcontrollers (MCUs) supporting three LCD drive voltage generation methods (external resistance division method / internal voltage boosting method / capacitor split method). In addition to RL78/L1x, Renesas has RL78/H1D equipped with UART that can communicate up to 19200 bps with subsystem clock (38.4 kHz), sampling output timer / detector function suitable for rotation detection by MR sensor, it is suitable for diaphragm gas meter construction.
| Block | Semiconductor device | Recommended products | Features, etc. |
|---|---|---|---|
| Main controller | MCU | RL78/L1x | 32 MHz, 16-bit, True low power, On-chip LCD controller/driver |
| RL78/H1D | 32 MHz, 16-bit, True low power, On-chip LCD controller/driver, On-chip timer for MR sensor |
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| Communication | Sub-GHz RF Transceiver | RAA604S00 | RF frequency range: 863 to 928 MHz, IEEE802.15.4g / 4e compliant hardware function |
| MCU built-in Sub-GHz RF Transceiver | RL78/G1H | 32 MHz, 16-bit CPU, RF frequency range: 864 to 928 MHz |
| Name | Part No. |
|---|---|
| RL78 / H1D evaluation board | HSBRL78H1D80R |