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
|Block||Semiconductor Device||Recommended Product Name||Features, etc.|
|Main controller||MCU||78K0/Lx3||On-chip LCD driver, low power consumption|
|MCU peripheral||Reset IC||RNA519xx Series||Variable detection voltage|
|Op-amp||HA1630 Series||General-purpose CMOS op-amp, comparator|
|General use |
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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