ThingMagic Mercury xPRESS Platform v1.7 - Manual (Page 110)

A D I V I S I O N O F T R I M B L E
110 Hardware Reference Guide
Controller to monitor the temperature of the battery and not charge it if the battery is too
hot or too cold.
Two metal loops are provided to supply 5VDC to the xPRESS motherboard via a lab
bench-top supply.
One of the jumpers on the board, J17, controls whether power is taken from the Comm
Bus interface or from other sources (AC adapter, USB, Battery). Make sure it is in the
position shown in the picture (closest to the board edge) for normal operation. If an
accessory module is plugged into the Comm Bus interface which can supply 5 VDC
power to the system, such as a Power-over-Ethernet (POE) module, then move this
jumper away from the edge of the board. Note that this will disconnect AC adapter,
battery, and USB power from the main system power bus (although they are still
connected to each other, so the battery can be charged).
System controls and indicators
The master push-button on/off switch disconnects everything except for the battery
charger. (An LTC2950-1 push-button controller is used to prevent signal bounce and