D
IRECTION 5771498-100, REVISION 5 VENUE™ SERVICE MANUAL
Chapter 5 - Venue™Components and Function (Theory) 5-27
PRELIMINARY
5-10-4 System Power Management
The System Power Management is responsible for operating the system in different power states, in
accordance with the power condition and User request.
System Power Management comprises the following:
• The PSU Module, responsible for the following functions:
• Convert 100 - 240V AC to Isolated 18V DC power supply
• The MPB module is responsible for the following:
• Battery Charger controlled by the SOM
• Automatic Switching from AC power line (18V DC after conversion by PSU) and battery power
(12v-16.8v)
• The Embedded Controller (SOM), is responsible for the following functions:
• Control the power-up and wake-up sequences
• Battery Monitoring and Battery Charger control
• Interface to the PSU
• Interface to the T-CFE Power sequencing and Monitoring Device
• Back End Thermal Management
5-10-5 Rechargeable Battery Pack
The battery pack consists of Li-Ion cells, protection and fuel gauge electronics, and connectors.
The battery module consists of 3 batteries bound together by plastic brackets. All battery packs are
electrically isolated.
• The main functions of the battery fuel gauge are:
• Charge and discharge operation
• Battery pack fuel gauging (PIC16F886)
• Resettable primary protection (over voltage, under voltage, and discharge over current).
• Non resettable secondary protection (over voltage and FET over-temperature).
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