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Water Meter
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Overview
As the requirement to save energy and to become more eco-friendly has increased the use of smart meters to remotely control a variety of household appliances and systems for the more efficient use of local energy resources. Alongside the adoption of smart grids, electronic water meters are increasing in numbers, providing a total utility solution. MCUs used in water meter designs must have extremely low power consumption and operate at low voltage.
Renesas’ 78K0/Lx3 and R8C/Lx Series of MCUs consume very little current in the standby state and can operate on a wide range of voltages. In addition, a high proportion of the MCU’s pins are devoted to LCD drive, which is suitable for products equipped with LCD displays. The small package size makes it possible to design more compact meters. These MCUs are suitable for use in water meters.
System Block Diagram
Recommended Products
| Block | Semiconductor device | Recommended products | Features, etc. |
|---|---|---|---|
| Main controller | MCU | 78K0/Lx3 | On-chip LCD driver, low power consumption |
| R8C/Lx Series | |||
| EEPROM | R1EX24xxx Series | I2C bus interface *1 | |
| R1EX25xxx Series | SPI bus interface *2 | ||
| MCU peripheral | Reset IC | RNA519xx Series | Variable detection voltage |
| General use surge absorption circuit protection, etc. | Zener diode | HZMxNB Series | 3-terminal (1 device included) face-mount outline |
| HZU/HZC Series | 2-terminal face-mount outline | ||
| NNCDxxDA Series | High ESD tolerance optimal for use in surge absorption | ||
| RDxxS Series | 2-terminal face-mount outline | ||
| Switching diode | HSM2838C, HSM123 | 3-terminal (2 devices included) face-mount outline | |
| HSU119/HSC119 | 2-terminal face-mount outline | ||
| Schottkey diode | HRC0103C | 2-terminal face-mount outline (low VF, low leak current) | |
| HRB0502A | 3-terminal face-mount outline (low VF) | ||
| RKR0202AQE | 3-terminal face-mount outline (low VF) | ||
| I/O | MOS FET | RQJ0203WGDQA, RQJ0202VGDQA | Low voltage (2.5 V) drive, MPAK |
| RQK0203SGDQA, RQK0204TGDQA | Low voltage (2.5 V) drive, MPAK | ||
| HAT1094C, HAT1095C | Low voltage (1.8 V) drive, CMFPAK-6 | ||
| HAT2205C, HAT2206C | Low voltage (1.8 V) drive, CMFPAK-6 | ||
| µPA1917, µPA1919 | Low voltage (1.8 V) drive, SC-95 |
*1 I2C: Inter-Integrated Circuit
*2 SPI: Serial Peripheral Interface
Related Application Notes/Sample Code
|
Title
| Document No. |
|---|---|
| Power MOS FET application note | REJ05G0001-0200 |
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