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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
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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.
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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
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Garmin Vivofit F4ARND00 #17000-140425-PWd - Page 3
Component Arrangement
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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
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Garmin Vivofit F4ARND00 #17000-140425-PWd - Page 5
Main Board (Side 2)
Battery
Battery
Button
Display
Grid = 1 cm
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Garmin Vivofit F4ARND00 #17000-140425-PWd - Page 6