Activity monitors (High-end) are devices that monitor a person's various daily activities. Unlike pedometers, activities other than walking, such as sitting at a desk or sleeping, can also be measured. This allows the number of calories consumed each day to be calculated. Thus, the use of activity monitors for health monitoring and dieting is spreading.
Since activity monitors need to be portable enough to be carried everywhere, small size and low power consumption for longer battery life are essential. In addition, since movements other than simple up-and-down motions need to be measured, the volume of data is very large and complicated calculations are required. The acceleration sensors contained in activity monitors may use any of a variety of methods to output serial data, so the microcontroller needs to be able to support various types of communication methods. In addition, support for communication functions such as USB and Bluetooth is needed so that activity, calorie consumption, and other data can be transferred to and managed on a personal computer or a mobile phone.
The Renesas 78K0/Lx3, the R8C/Lx and RL78/L1x Series have low power consumption and are capable of performing the complicated calculations required by activity monitors. These microcontrollers are also equipped with serial communication functions such as UART, I2C, and SSU (Synchronous Serial communication Unit), so they are capable of obtaining various kinds of data from acceleration sensors. Thanks to a built-in LCD drive circuit and peripheral functions such as an oscillator, a watchdog timer and a real-time clock, much fewer external parts than a pedometer are required, making more compact size and cost reduction possible
System Block Diagram
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|Block||Semiconductor device||Recommended products||Features, etc.|
|Main controller||MCU||78K0/Lx3||On-chip LCD driver, low power consumption|
|RL78/G1x Series||Low power consumption|
|EEPROM||R1EX24xxx Series||I2C bus interface*1|
|R1EX25xxx Series||SPI bus interface*2|
|SRAM||R1LVxxxx Series||Low power consumption, guaranteed over wide temperature range|
|MCU peripheral||Reset IC||RNA519xx Series||Variable detection voltage|
|Op-amp||HA1630 Series||General-purpose CMOS op-amp, comparator|
Low power consumption
|USB||USB device controller||M66592||Hi-Speed USB device, small package|
|R8A66597||Hi-Speed USB host, small package|
|μPD72010x||Hi-Speed USB host, small package|
|General use, surge absorption, circuit protection, etc.||Zener diode||NNCDｘｘDA Series||High ESD tolerance optimal for use in surge absorption|
|RDｘｘS Series||2-terminal face-mount outline|
*1 I2C : Inter-Integrated Circuit
*2 SPI : Serial Peripheral Interface
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