Power Subsystem - Texas Instruments Extensa 450 Series Maintenance Manual

4.2.7
The Power Subsystem consists of the following major parts:
4.2.7.1
The notebook is equipped with a power management function that minimizes
battery usage for prolonged battery operation and automatically recharges the
batteries when the notebook is used with an AC adapter.
The power management modes and warnings include the following:
4-8 Theory
Direct connection to ISA (PC AT) Bus
Direct connection to PCMCIA 2.0 Bus
PCMCIA 2.0- and JEIDA 4.1-compliant
82365SL-compatible register set, ExCA-compatible
Automatic Low-power Dynamic Mode for lowest power consumption
Programmable Suspend Mode
Five programmable memory windows per socket
Two I/O windows per socket
Programmable card access cycle timing
8- or 16-bit CPU interface
8- or 16-bit PCMCIA interface support
ATA disk interface support
Automatic flash memory timing support
Easy host interface using ISA I/O addresses 03E0h, 03E1h
Mixed-voltage (3.3V or 5V) operation
Dual-socket-interface, 208-pin QFP

Power Subsystem

Power Management (hardware and software components)
AC Adapter
Primary Battery Board
Primary Battery Pack
Secondary Battery Board
Secondary Battery Pack
Power Management