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Electronic Thermometer
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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 and the R8C/Lx 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 | |||
| 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 | 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 | ||
| Schottky diode | HRB0502A | 3-terminal face-mount outline (low VF) | |
| HRC0103C | 2-terminal face-mount outline (low leak current) | ||
| RKR0202AQE | 3-terminal face-mount outline (low VF) |
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