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Electronic Scale
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Electronic scales are widely used in kitchens and as bathrooms because they can quickly make accurate weight measurements. They sense the weight of an object using a bridge-type distortion gauge consisting of a load cell attached to a metal plate. Because the output voltage of this sensor is very small, the signal is amplified by an op-amp and input to the A/D converter built into the MCU in the system circuitry.
Renesas Electronics offers a lineup of MCU products suitable for small, lightweight electronic scales, including the chips in the H8/38086R Group, which have a built-in high-precision 14-bit ΔΣ-type A/D converter. Among our other solutions for such scales are the MCUs in the 78K0/Lx3 and the R8C/Lx Series, which provide an on-chip LCD drive-control circuit.
System Block Diagram
Recommended Products
| Block | Semiconductor device | Recommended products | Features, etc. |
|---|---|---|---|
| Main controller | MCU | 78K0/Lx3 | On-chip LCD driver, low power consumption |
| H8/38086R Group | |||
| R8C/Lx Series | |||
| MCU peripheral | Reset IC | RNA519xx Series | Variable detection voltage |
| EEPROM | R1EX24xxx Series | I2C bus interface *1 for saving settings | |
| R1EX25xxx Series | SPI bus interface *2 for saving settings | ||
| SRAM | R1LVxxxxx Series | Low power consumption, guaranteed over wide perating temperature range | |
| General use surge absorption circuit protection, etc. | Zener diode | HZMxNB Series | 3-terminal (1 device included) face-mount outline |
| HZLxxZ4 Series, RKZxxKG, KK Series | 2-terminal face-mount outline High ESD tolerance optimal for use in surge absorption | ||
| Switching diode | HSC/HSD119/HSU119 | 2-terminal face-mount outline | |
| HSM/HSB2836 Series | 3-terminal (2 devices included) face-mount outline | ||
| Schottky diode | HRC0103C/RER0202 Series | 3-terminal face-mount outline (low VF, low leak current) | |
| HRV103B, RKR104BRH | low IR, low VF type | ||
| RKR0505BKH | 3-terminal face-mount outline (low VF) |
*1 I2C: Inter-Integrated Circuit
*2 SPI: Serial Peripheral Interface
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