Cmt Power Management Principle - Nokia 9000i Service Manual

RAE/RAK–1N
PDA Hardware

CMT power management principle.

The goal is that existing power management scheme of CMT in HD841 is
changed as little as possible. CMT module has power switch that works as
on normal DCT1 cellular phones. The CMT_PDA_REQUEST_SERVICE
state is implemented to support requests from PDA even when CMT is
switched off. RF is not activated when CMT is on the
CMT_PDA_REQUEST_SERVICE state. If
CMT_PDA_REQUEST_SERVICE state is activated by PDA, CMT
switches itself off after requested action is done. CMT power states are
illustrated in Figure 4.
Power on,
charger connect or
PDA XPWRON pulse
Power on
Figure 4.
Page 6 – 20
CMT_OFF
CMT_PDA_REQUEST_SERVICE
CMT_ON
CMT power states from PDA point of view.
After Sales
Technical Documentation
CMT software
5s from last
RBUS activity
Battery level request
Setting changes
Power off or
CMT battery cutt–
off
Original, 08/96