Integration Guide

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
Serial Wire Debug Interface
4.1.3 UART Host
The UART is required for communicating between the GEM3 module and fitness machine
console using the GEMSAFE or HCI command protocol. Pins 20 and 21 of the GEM3 module have
been configured as the UART interface. Pin 20 is the GEM3 module TX line that connects to the
Host RX line. Pin 21 is the GEM3 module RX line that connects to the Host TX line.
UART Host
4.1.4 USB
Integrated (on-module) USB transceiver (PHY). The USB device (USBD) controller implements a
full speed USB device function that meets 2.0 revision of the USB specification.