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Plug-in Meter
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Overview
Plug-in meters can be used to easily measure and display the power consumption of electric appliances used in a household. Not only can plug-in meters measure the power consumption of each electric appliance, but they can also calculate the cost of electricity consumed, the amount of carbon dioxide, and other information. This has attracted the attention of energy and eco-conscious consumers wishing to reduce the wasteful use of power in their homes.
The power consumption of electric appliances ranges broadly from several watts to more than a thousand watts. Therefore, an A/D converter with a resolution of at least 10 bits is needed for measuring the current value that greatly influence power calculation. In addition, because plug-in meters are meant to be inserted between a commercial power supply and an electric appliance, small size and low weight are required. Furthermore, low cost is also an important factor for easing adoption by every household.
To help designers realize these functions Renesas offers the 16-bit microcontroller R8C Family and the 78K0R Series. In addition, we offer a lineup of a variety of general-purpose semiconductors for use in current measurement or power supply, as well as EEPROM and other memory products for data storage, in order to meet our customers' needs.
In particular, the R8C/Lx Series and 78K0R/Lx3 Series microcontrollers have a built-in A/D converter, a requirement for power calculation. Furthermore, since an LCD drive control circuit is built in, external parts and cost can be reduced.
System Block Diagram
Recommended Products
| Block | Semiconductor device | Recommended products | Features, etc. |
|---|---|---|---|
| Main controller | MCU | R8C/Lx Series | 16-bit MCU, LCD control, 10-bit ADC*1 |
| 78K0R/Lx3 Series | 16-bit MCU, LCD control, 12-bit ADC*1 | ||
| EEPROM | R1EX24xxx Series | I2C bus interface*2 | |
| R1EX25xxx Series | SPI bus interface*3 | ||
| Power supply | Series regulator | HA178L05A | 100ma, 5V output version, TO-92MOD outline |
| μPC78L05T | 100ma, 5V output version, SOT-89 outline | ||
| General use, surge absorption, ircuit protection, etc. | Zener diode | HZMxNB Series | 3-terminal (1 device included) face-mount outline |
| HZU 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 | ||
| HSM83 | 2-terminal face-mount outline, high voltage | ||
| Schottky diode | HRB0502A | 3-terminal face-mount outline (low VF) | |
| HRC0103C | 2-terminal face-mount outline (low VF and low leak current) | ||
| HRV103A、RKR104BKH | 2-terminal face-mount small outline (Io = 1A) | ||
| Op-amp | HA17902 | Quad op-amp for single power supply (low consumption) | |
| μPC324 | Quad op-amp for single power supply (low consumption) |
*1 ADC : Analog to Digital Converter
*2 I2C : Inter-Integrated Circuit
*3 SPI : Serial Peripheral Interface
Related Application Notes/Sample Code
| Title | Document No. |
|---|---|
| R8C/35C Group A/D Read | REJ05B1330-0100 |
| R8C/35C Group A/D Converter in Single Sweep Mode | REJ05B1332-0100 |
| R8C/L3AC Group LCD Drive Control Circuit (External Division Resistor, Blink Function) | REJ05B1164-0100 |
| R8C/L3AC Group LCD Drive Control Circuit (External Voltage Multiplier Reference Power, Blink Function) | REJ05B1165-0100 |
Related Boards
| Name | Part No. |
|---|---|
| Renesas Starter Kit for R8C/L3AC | R0K52L3A0S000BE |
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