Integration Guide
Table Of Contents
GEM3 Module Hardware Integration Guide Version 0.1
North Pole Engineering
221 N 1st St, Minneapolis, MN 55401
www.npe-inc.com
612.305.0440
1 OVERVIEW AND KEY FEATURES
The GEM3 module has been designed to allow OEMs to easily add Bluetooth and ANT+ wireless
connectivity in their product offering. The GEM3 module incorporates North Pole Engineering
software specifically designed to enable fitness machines such as treadmills, exercise bikes,
ellipticals, rowers, stair climbers and step machines, etc. to wirelessly communicate exercise
data with smart phones 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 GEM3 module is based on Nordic Semicondutor’s nRF52840 multiprotocol Bluetooth and
ANT+ chipset with 1 MB of flash and 256kB of RAM. The GEM3 module offers a variety of
peripheral interfaces including USB, NFC, UART, SPI, I2C, ADC, and GPIO, has a maximum
transmit power of +8dBm, and a sensitivity of -103dBm. This manual is intended to assist
hardware integration of the GEM3 module into a given design. Details on North Pole Engineering
GEMSAFE and GEMHCI software can be found http://npe-inc.com For applications using Nordic
Semiconductor SDK, please refer to Nordic Semiconductor’s SDK available at
developer.nordicsemi.com.
1.1 FEATURES
• -103 dBm sensitivity
• TX Power-20 to +8dBm in 4dB steps
• 600m line of sight range @ +8dBm ,125Kbps(coded) phy
• 4.8 mA peak TX @ 0dB
• 4.6 mA peak RX
• 1dB dB RSSI resolution
• ARM® Cortex
TM
M4 32 bit processor running at 64MHz
• 1 MB embedded flash memory and 256 kB RAM
• Onboard NFC for Out of Band pairing
• Peripheral Interfaces: USB, QSPI, PPI, ADC, GPIO, SPI, I2C, UART, I2S, PWM, QDEC, Low
power comparator, Temperature sensor.
• AES HW encryption
• FCC, CE, IC, China, South Korea, and Japan certified
• Integrated Antenna
• RoHS compliant
• Bluetooth End Product Listed
• Integrated Fitness Equipment Firmware and mobile application