Wearable Key Device by ROHM

Before we continue, last do some recap. On the first post for this week, we discussed about Microchip's MCU with Dual ADC Peripheral. It is a low-cost 8-bit MCU, which are available in 14 and 20 pins. The second is Intersil's ISL78692. It is a complete battery charger for single-cell Lithium chemisty batteries. Now, for the third post, we will discuss about wearable key devices by ROHM.


Most wearable devices today are designed to do monitoring, i.e. counting steps, estimating calories burned, and so many others. ROHM engineers envisioned to be on top of the growing market on this trend. Which is why, they developed a breakthrough key-shaped device utilizing sensor synergy and sensor fusion technology, combining sensors from ROHM and Kionix with LAPIS Semiconductors Bluetooth® LE communication IC and sensor hub microcontroller.

Integrated sensors include a 3-in-1 proximity + ambient light sensor + IR LED, optical UV sensor, MEMS accelerometer and gyroscope, piezoresistive barometric pressure sensor, ultra-high sensitivity MI (Magnetic Impedance) sensor, and RGB sensor. Power is provided by an efficient 110mA/hr lithium ion battery that enables continuous operation for over 8 hours while requiring only 1 hour to fully charge (via USB).

Key Features:

• Activity Monitoring
• The lightweight form factor makes carrying effortless and unobtrusive. Not only can the device estimate calories burned and count the number of steps taken, it can even detect when the wearer is riding in a vehicle (i.e. bus, train, car) or walking up/down stairs – and track time traveled.
• Gesture Control
• Lock and unlock compatible tablets and smartphones by holding the key device and simply drawing a ‘U' or ‘L' in the air, providing greater convenience and peace of mind.
• UV Measurement
• Attach the device externally around the neck or attached to a belt to measure the amount of UV radiation in order to prevent sunburn or excessive exposure.
• Distance Measurement
• Point the key at the top of a well-known (preloaded) metropolitan landmark or building in order to instantly obtain the distance and approximate walking time.
• Metal Detection 
• Detect small foreign metal objects in food using the built-in high-sensitivity MI sensor – simply point the device at the food to obtain a reading.

To learn more about ROHM's breakthrough key-shaped device for wearable devices, click on the link below:
Wearable Key Device