Teardown: What Is Inside the FitBit Surge (FB501)?

18 August 2015
The following is an overview of a teardown analysis conducted by IHS Benchmarking.

The FitBit Surge is not a smart watch in the strictest sense, but it is more of a smart watch than a “simple” fitness monitor like the FitBit Flex.

Among the distinguishing features are a built-in optical heart rate sensor, GPS receiver and services like incoming call alerts, missed calls and text messages. The display is a 144 x 168 pixel monochrome LCD with a backlight for low ambient light situations.

The optical heart rate sensor is based on FitBit’s PurePulse technology, which uses LEDs and photo-sensors to sense the changes in local blood vessel volume with each heartbeat. Heart rate monitoring and tracking is 24/7, as is automatic sleep tracking.

Summary points:

  • Smart Watch - Time, GPS tracking, Text, Fitness, and More
  • Built-In GPS, Heart Rate Monitoring
  • Data Connection via Bluetooth 4.0
  • 1.26", 144 x 168 Pixel Transflective Mono LCD

Target market: Consumer

Released: 1Q2015

Pricing: $249.90

Availability: Worldwide

Total cost (direct materials and manufacturing): $36.89

Major Components:

- MCU, 32-Bit ARM Cortex-M3, 48MHz, 1024KB Flash, 128KB RAM, 8-Channel 12-Bit ADC, 93 GPIOs - MFG: SILICON LABORATORIES INC - MPN: EFM32GG395F1024-BGA120 - (Qty: 1)

- Enclosure, Main, Top, Injection Molded Plastic, w/ 8 Pressed-In Threaded Brass Inserts, w/ Etched Copper Antenna, w/ 3 Epoxy Potted - (Qty: 1)

- Display Window / Touchscreen Assembly, 1.26" Diagonal, Capacitive, GF2 Type, Painted, w/ Integral Flex PCB - MFG: ALPS ELECTRIC CO LTD - (Qty: 1)

- Display Module, 1.26" Diagonal, Transflective Monochrome, 144 x 168 Pixels, 175 ppi, w/ Integral Flex PCB, w/ 1 LED Backlight - MFG: SHARP CORP - MPN: LS013B7DH01 - (Qty: 1)

- Enclosure, Main, Bottom, Injection Molded Plastic, Clear Coated, w/ 8 Pressed-In Threaded Brass Inserts, w/ Injection Silicon Rubber - (Qty: 1)

- Bluetooth USB Dongle, Bluetooth V4.0, Contains Texas Instruments CC2540 - (Qty: 1)

- 8-Layer, FR4/RCF HDI, 3+2+3, Lead-Free - MFG: MULTEK HONG KONG LTD - (Qty: 1)

- Accelerometer / Gyroscope / Magnetometer, 9-axis Motion Tracking, ±2g/±4g/±8g/±16g Accelerometer, ±250dps/±500dps/±1000dps/±2000dps Gyroscope, 3-Axis Magnetometer - MFG: INVENSENSE INC - MPN: MPU-9250 - (Qty: 1)

- Amplifier, Op Amp, 1.8V, 7MHz, Low Offset, Rail-to-Rail - MFG: TEXAS INSTRUMENTS INC - MPN: OPA2363AIRSVR - (Qty: 2)

- GPS Receiver, Single Chip, 66-Channel GPS, GNSS / QZSS / SBAS, ARM 7 CPU, w/ Built in LNA, w/ 16 GPIOs - MFG: MEDIATEK INC - MPN: MT3339 - (Qty: 1)

Device OverviewDevice Overview

Main PCB TopMain PCB Top

Main PCB BottomMain PCB Bottom

Heart Rate Sensor PCB BottomHeart Rate Sensor PCB Bottom

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