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January 2010
Mini Satellite Board
In addition, most Harmony devkits include the “mini satellite board”, which replicates the main power,
reset and recovery buttons, adds a UART serial port for low-level debugging on some OSes, and switches
and LEDs for common “smartbook” features like lid close, wifi on/off, etc. An appendix at the end of this
document provides connection instructions. The board is pictured below:
• UART serial port. Standard serial port for use with some OS images for low-level logging and
debugging
• Power, reset, recovery buttons. Replicated from the main board so that all controls may be
found on the satellite board. Useful if the main board is somehow packaged
• Simulated lid switch. On some OS images, setting this switch causes the device to sleep
• Dual ribbon cables. Connection to the main board
• Wifi, BT, etc status LEDs. Provides activity status of major peripherals
• WiFi switch. Enables/disables WiFi radio
serial port
cables to
main board
status LEDs
recovery
switch
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