After Sales
Technical Documentation
RAE/RAK–1N
PDA Hardware
Page 6 – 20
Original, 08/96
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.
Figure 4. CMT power states from PDA point of view.
CMT_OFF
CMT_ON
CMT_PDA_REQUEST_SERVICE
CMT software
5s from last
RBUS activity
Power on,
charger connect or
PDA XPWRON pulse
Power off or
CMT battery cutt–
off
Power on
Battery level request
Setting changes
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