Power Subsystem - Acer Extensa 900 Series Maintenance Manual

Supports PC/PCI DMA on both PC Card sockets
Supports Zoom Video Mode
Supports Ring Indicate
Packaged in 208-pin Thin Plastic Quad Flatpack (PDV)

4.2.11 Power Subsystem

The notebook is equipped with a software/hardware monitored/controlled Power
Subsystem that minimizes battery usage for prolonged battery operation and
automatically recharges the batteries when the notebook is used with an AC adapter.
The control for the power subsystem is implemented with the ALI M6377 Power
Management Unit chip as described below.
A simplified block diagram of the power subsystem is shown in Figure 4-3.
4-20 Theory of Operation