Renesas' RL78/L1x Series of MCUs are famous for low power consumption in the standby state and can operate on a wide range of voltages. In addition, a broad lineup of packages is available, so an MCU with the necessary functionality and size can be selected. Also, the RL78/H1D has built-in timers that support magnetic sensors for rotation detection, making it easier to build a system.

Water Meter

System Block Diagram

Recommended Products
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
I/O MOS FET μPA26xx Series
μPA28xx Series
2×2mm package
3×3mm package
µPA263x Low voltage (1.8 V) drive, HUSON2020
Related Application Notes/Sample Code