Singapore/South & Southeast Asia/Oceania
Electronic Thermometer
Overview
Electronic thermometers are now used in more and more households. They must be compact, lightweight, consume little power and provide extended battery life. Consumers also require a quick response time for reading and accurate measurement. When measuring body temperature, a double integral A/D converter circuit is used to achieve precise measurements of small voltage fluctuations. Electronic thermometers also need LCD functionality to display the measurement data, a buzzer for audible notification when a measurement is complete, and flash ROM for storing sensor trimming data.
Renesas’ 78K0/Lx3, the R8C/Lx Series and the RL78/L1x Series of MCUs integrate on-chip a double integral A/D converter, EEPROM data flash and an LCD drive control circuit. They are also available in low-pin-count versions, making them ideal for use in compact and lightweight electronic thermometer applications.
System Block Diagram
Recommended Products
| Block | Semiconductor Device | Recommended Product Name | Features, etc. |
|---|---|---|---|
| Main controller | MCU | 78K0/Lx3 | On-chip LCD driver, low power consumption |
| R8C/Lx Series | |||
| RL78/L1x Series | |||
| MCU peripheral | Reset IC | RNA519xx Series | Variable detection voltage |
| Op-amp | HA1630 Series | General-purpose CMOS op-amp, comparator | |
| General use surge absorption circuit protection, etc. | Zener diode | RDxxM Series | 3-terminal (1 device included) face-mount outline |
| NNCDxxDA Series | High ESD tolerance optimal for use in surge absorption | ||
| RDxxS Series | 2-terminal face-mount outline |
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