GEM Module Hardware Integration Guide
Version 0.3
Wahoo Fitness
5
90 West Wieuca Road, Suite 110
Atlanta, GA 30342
www.wahoofitness.com
1-‐877-‐978-‐1112
Overview and Key Features
The GEM module has been designed to allow OEMs to easily add Bluetooth and ANT+
wireless connectivity in their product offering. The GEM module incorporates Wahoo
Fitness software specifically designed to enable fitness machines such as treadmills,
exercise bikes, ellipticals, rowers, stair climbers and step machines to wirelessly
communicate exercise data with smart phone or tablets as well as leaderboard software
systems. For applications other than fitness machines, developer’s can use Nordic
Semiconductor’s SDK to create their own embedded application specific software.
The GEM module is based on Nordic Semicondutor’s nRF51422 dual band Bluetooth and
ANT+ chipset. The GEM module offers a variety of peripheral interfaces including UART,
SPI, I2C, ADC, and GPIO, has a maximum transmit power of +4dBm, and a sensitivity of
-‐93dBm. This manual is intended to assist hardware integration of the GEM module into a
given design. Details on Wahoo’s Fitness Machine software can be found in the GEM module
Fitness Machine Software guide. For applications using Nordic Semiconductor SDK, please
refer to Nordic Semiconductor’s SDK available at developer.nordicsemi.com.
Features
•
-‐90 dBm sensitivity in ANT mode
•
-‐93 dBm sensitivity in
Bluetooth
® low energy mode
•
TX Power-‐20 to +4dBm in 4dB steps
•
100m line of sight range
•
13 mA peak RX
•
9.7 mA peak RX
•
1 dB RSSI resolution
•
ARM® CortexTM-‐M0 32 bit processor
•
256 kB embedded flash memory and 16 kB RAM
•
Peripheral Interfaces: ADC, GPIO, SPI, I2C, UART, Low power comparator,
Temperature sensor
•
AES HW encryption
•
FCC, CE, IC certified
•
Integrated Antenna
•
RoHS compliant
•
Bluetooth End Product Listed
•
Integrated Fitness Machine Firmware and mobile application
