GEM 2 Module Hardware Integration Guide
Version 0.1
Wahoo Fitness
4
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 2 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 2 module is based on Nordic Semicondutor’s nRF52832 multiprotocol Bluetooth
and ANT+ chipset. The GEM 2 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 ‐96dBm. This manual is intended to assist hardware integration of the GEM 2 module
into a given design. Details on Wahoo’s GEMSAFE and GEMHCI software can be found
www.wahoogy.com. For applications using Nordic Semiconductor SDK, please refer to
Nordic Semiconductor’s SDK available at developer.nordicsemi.com.
Features
• ‐96 dBm sensitivity
• TX Power‐20 to +4dBm in 4dB steps
• xxm line of sight range
• 5.3 mA peak TX @ 0dB
• 5.4 mA peak RX
• 1dB dB RSSI resolution
• ARM® Cortex
TM
M4F 32 bit processor running at 64MHz
• 512 kB embedded flash memory and 64 kB RAM
• Onboard NFC for Out of Band pairing
• 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 Equipment Firmware and mobile application
