Product News
Weltrend Semiconductor Kaohsiung Branch's Wearable HRM Reference Design Adopted in Golf Smartwatch
2016-11-11
Kaohsiung, Taiwan, November 11, 2016 – Weltrend Semiconductor (TAIEX: 2436) Kaohsiung Branch, in partnership with its solution provider, today announced the reference design for heart rate monitoring solution on wearable devices that combines Weltrend’s WTHRM122 heart rate monitoring (HRM) MCU with analog front-end (AFE), New Japan Radio (New JRC)’s optical sensor, and ROHM (Kionix)’s KXTJ2-1009 accelerometer. | |
The solution is in mass production and a recent success case is the adoption of the solution by a major ODM inside its latest smartwatch for golf that combines golf trainer, activity tracking, built-in green light heart rate sensor, GPS, and Bluetooth functions. It is the first golf smartwatch with heart rate measurement, according to the ODM, and is available now for sale at on-line retailers such as Amazon. | |
Weltrend’s WTHRM122 is a heart rate monitoring MCU, using PPG (Photoplethysmographic) technology, for the application of continuous heart rate measurement. It includes CPU, flash memory, SRAM, ADC, filters, amplifiers, LED intensity control circuits, serial interfaces, and internal oscillator. | |
PPG is a non-invasive technique which is especially suitable for wearable technologies/devices. With Weltrend’s state-of-the-art automatic motion artifact removal algorithm, WTHRM122 could be used on wearable devices such as smartwatch, sport watch, or bracelet to continuously detect, measure, calculate and display heart rate during exercise, walking, running, and etc. | |
ROHM (Kionix)’s KXTJ2-1009 is one of the Company’s smallest tri-axis accelerometers, designed for mobile/wearable applications. It offers excellent power performance along with an embedded motion wake-up feature, Fast-mode I2C and up to 14-bit resolution. The KXTJ2-1009 is delivered in a 2 x 2 x 0.9 mm, 12-pin, LGA package with an operating temperature range of -40°C to +85°C. | |
The KXTJ2-1009 sensor offers improved shock, reflow, and temperature performance, and the ASIC has internal voltage regulators that allow operation from 1.8 V to 3.6 V within the specified product performance. | |
Features of the WTHRM122 include: | |
● | Supply Voltage Range: 3.3V @ VDDPST, AVDD, VDDADC |
● | Supply Voltage Sources: |
- Digital circuits: VDDPST | |
- Analog-to-Digital Converter (ADC): VDDADC | |
- Analog circuits: AVDD | |
● | Transmit Path: |
- Programmable LED duty control | |
- Automatic LED intensity control | |
● | Receive Path: |
- Integrated band pass filters, low noise amplifiers and ADC | |
- Integrated motion artifact removal algorithm | |
● | I2C/UART Interface: Heart rate data output |
● | Power Management: Power-on Reset/Brown-Out Reset (POR/BOR) |
● | Package: QFN32 (4 mm x 4 mm x 0.75 mm) |
Key Specifications of the KXTJ2-1009 include: | |
● | VCC Voltage Range: 1.8V to 3.6V |
● | g range: ±2.0, ±4.0, ±8.0 |
● | Current Consumption: 10 ~ 135μA (Typ) |
● | Standby Mode Current: 2μA |
● | Operating Temperature Range: -40°C to +85°C |
Further information on the products are available at: http://www.weltrend.com.tw/en-global/product/detail/66/82/341 http://www.kionix.com/product/KXTJ2-1009 |
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About Weltrend Semiconductor Inc. | |
Founded in 1989 in the "Silicon Valley of Taiwan", the Science-Based Industrial Park (SBIP) in Hsinchu, Weltrend (TAIEX: 2436) is a leading fabless semiconductor company, also known as IC design house, specializing in the planning, design, testing, application development and distribution of mixed-signal/digital IC products across multiple applications. |