Deep Dive Report Garmin Vivofit F4ARND00 Bluetooth 4.0; USB ANT+ Report #17000-140425-PWd Product Description The Garmin Vivofit is a wearable fitness device that collects and records personal health data during physical activities like walking or running as well as while you’re resting or sleeping. It tracks your progress 24/7 and can operate for over a year on a single battery charge. All collected data can be easily transferred via Bluetooth 4.0 or USB ANT+ to a computer or compatible mobile device via the Garmin Connect Mobile app. With the touch of a button, you can also sync the data with the Garmin Connect online fitness community for tracking your progress and getting support in meeting personal fitness goals. The Vivofit features a 1.15-in. 5-segment LCD display. It runs on a Nordic Semiconductor nRF51422 ANT/Bluetooth SoC with ARM Cortex M0 CPU, 16 KB RAM, and 256 KB flash. It’s also water resistant to a depth of 50 meters and features a real-time clock with alarm and 3-axis MEMS accelerometer. The Garmin Vivofit is powered by two CR1632 3 V batteries that provide a year of use time. DISCLAIMER: All company names, product names, and service names mentioned are used for identification purposes only and may be registered trademarks, trademarks, or service marks of their respective owners. All analyses are done without participation, authorization, or endorsement of the manufacturer. Any cost analyses presented in this material are estimates prepared by TechInsights from generally available data. While TechInsights believes that these estimates reflect the probable costs, the actual producer did not supply the data, and therefore the actual costs may be different from these estimates. Furthermore, TechInsights extends no warranties with respect to any information in this document, and shall bear no liability whatsoever for the use of the information. Copyright © 2014, TechInsights. All rights reserved. Do not reproduce, distribute, disseminate, photocopy, fax, transmit, download to a shared database, or otherwise copy, transfer, sell, publish, or send this material, or any portion thereof, by any means without the express written permission of TechInsights. www.teardown.com support@techinsights.com Block Diagram Bluetooth Antenna 1 - Silicon Labs #CP2400 Segment LCD Driver 7 - STMicroelectronics #M41T62 Real-Time Clock w/ Alarm 2 - Nordic Semiconductor #nRF51422 ANT / ANT+ / Bluetooth SoC w/ ARM Cortex M0 CPU (16 KB RAM & 256 KB Flash) 5 - Linear Technology #LTC3388-1 Step-Down Regulator 6 - Analog Devices #ADXL362 3-Axis MEMS Accelerometer 3 - Texas Instruments #TPS3420 2-Ch. Push-Button Controller Estimated block diagram based on observation of this specific product implementation, manufacturer’s data sheets where available, and best engineering judgment. Certain details of the interface circuitry are not reflected in this block diagram. Partitioning and connectivity are speculative. Copyright © 2014, TechInsights www.teardown.com support@techinsights.com Garmin Vivofit F4ARND00 #17000-140425-PWd - Page 2 Supporting Materials (ANT+/BT USB Adapter) Antenna Nordic Semiconductor #nRF24LU1*** 2.4 GHz Transceiver w/ USB Microcontroller & Flash Memory Cost Breakdown as follows: IC*: $0.73 PCB**: $0.11 Ceramic Crystal*: $0.20 Active Discretes*: $0.06 Passive Discretes*: $0.27 Enclosures: $0.10 Total: $1.47 *Includes insertion cost **Includes test cost ***IC identification only, not found in BOM Copyright © 2014, TechInsights www.teardown.com support@techinsights.com Garmin Vivofit F4ARND00 #17000-140425-PWd - Page 3 Component Arrangement Copyright © 2014, TechInsights www.teardown.com support@techinsights.com Garmin Vivofit F4ARND00 #17000-140425-PWd - Page 4 Main Board (Side 1 IC Identification) 7 - STMicroelectronics #M41T62 Real-Time Clock w/ Alarm 6 - Analog Devices #ADXL362 3-Axis MEMS Accelerometer (2-Die Pkg.) 8 - Unknown #Unknown 2-Channel ESD Protection 5 - Linear Technology #LTC3388-1 Step-Down Regulator 9 - Unknown #Unknown 2-Channel ESD Protection 4 - Texas Instruments #TPS22902 Load Switch 2 - Nordic Semiconductor #nRF51422 ANT / ANT+ / Bluetooth LE SoC w/ ARM Cortex M0 CPU (16 KB RAM & 256 KB Flash) 3 - Texas Instruments #TPS3420 2-Ch. Push-Button Controller Grid = 1 cm Copyright © 2014, TechInsights www.teardown.com support@techinsights.com Garmin Vivofit F4ARND00 #17000-140425-PWd - Page 5 Main Board (Side 2) Battery Battery Button Display Grid = 1 cm Copyright © 2014, TechInsights www.teardown.com support@techinsights.com Garmin Vivofit F4ARND00 #17000-140425-PWd - Page 6