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GEM 2 Module Hardware Integration Guide
Electrical Specifications
Absolute Maximum ratings
Maximum and minimum ratings for digital and analog pins are listed below.
Parameter
VCC Voltage
Voltage at VIO
Storage Temperature ‐40C
Recommended Operating Parameters
Parameter
VCC
VCC maximum ripple
VCC Rise time
Operating Temperature @ 3.3V
Design Considerations
The GEM 2 module has been designed for easy integration into OEM applications requiring
minimal additional componentry. The following section provides suggestions to ensure
successful design in of the GEM 2 module.
Hardware
VCC
Ensure the power source operating range and noise is within the specified limits for the
GEM 2 module and filter capacitors are incorporated as needed. The GEM 2 module
includes decoupling capacitors for circuits within the module. External circuits sharing the
same power source should also be decoupled locally at connections to VCC and GND.
Updating Module Firmware
The GEM 2 module firmware can be updated over the air using the Wahoo utility
application. The Wahoo utility application can be downloaded here:
The GEM 2 module firmware can also be updated through the Serial Wire Debug interface.
The following circuit example provides a reference for developers wanting an alternative to
programming the GEM 2 module over the air:
Wahoo Fitness
90 West Wieuca Road, Suite 110
Atlanta, GA 30342
www.wahoofitness.com
1‐877‐978‐1112
Min
‐0.3V
‐0.3V
Min
1.7V
‐40C
Max
+3.9V
VCC+.3V
+85C
Typical
Max
3.0V
3.6V
10mV
60ms
+85C
Version 0.1
www.xxxx.yyy.com
8
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