ThingMagic Mercury xPRESS, Platform Manual, Page: 110 / 146

A D I V I S I O N O F T R I M B L E
110
Hardware Reference Guide
available externally through the Comm Bus interfaces. The Reset and Shutdown lines are
controlled by the processor.
No antenna is provided with the xPRESS platform, but an MMCX-to-Reverse-TNC
adapter cable is provided so the platform can be used with off-the shelf antennas.
Battery Charging Controller
The LTC 4098 Battery Charging Controller, and the switches it controls, form the heart of
the power management system. Functionality controlled by this IC include:
Š
Over-voltage protection for the power from the AC Adapter port
Š
Sourcing power from the AC adapter port when both it and USB power are present
Š
Switching between the battery powering the system and the AC source or USB port
both powering the system and charging the battery based on battery charge level
and power demand from the system.
Š
Charging the battery with the optimum level of current while monitoring the battery
temperature (if the battery is equipped with an “NTC” sensor).
More information about power management is provided in the Power Source Precedence
section of this chapter.