Shutdown; Slotted Mode Sleep And Dormant Mode; Figure 7: Current Measurement In Slotted Mode Sleep (Sci = 1) - Sierra Wireless MC5720 Hardware Integration Manual

P C I E x p r e s s M i n i C a r d H a r d wa r e I n t e g r a t i o n G u i d e

Shutdown

Shutdown mode is the state of the modem when /ShutDown (the shutdown
request) is asserted, or /DTR1 is deasserted—based on AT command
configuration—and the modem is shut down. The modem gracefully disconnects
any call and is ready to power down. This is the state entered via Windows
power management (ACPI suspend state).

Slotted mode sleep and dormant mode

The CDMA 1X specification describes a reduced power mode in which the
modem cycles between wake and sleep on a defined interval—the Slot Cycle
Index (SCI). Slotted mode sleep is the normal state of the modem between calls.
Dormant mode behaves in the same way as slotted mode sleep, but it keeps an
active PPP session open at both ends—even when there is no physical link
(channel resource) in place. The modem keeps the connection open but is
permitted to sleep for short periods when there is no active traffic.
For more information on slotted mode sleep and dormant mode, see the EM
Software Integration Guide.
Current consumption in sleep/dormant mode follows a pattern as illustrated in
Figure 7.

Figure 7: Current measurement in slotted mode sleep (SCI = 1)

The current consumption has a small spike at each slot cycle interval (1.28 s).
When the index value is reached, the modem comes on to check the quick paging
channel. The receiver's on-time is approximately 150 ms. If there is a call
request, the modem stays active to handle it.
The average current consumption of the EM during slotted mode sleep depends
on the SCI. Higher value SCI settings mean longer intervals between the
receiver being switched, therefore lower current consumption. The default slot
cycle index is 2, yielding the figures in Table 2 on page 25.
Table 3 shows the typical average slotted mode current consumption for each
SCI.
2 6 P r o p r i e t a r y a n d c o n f i d e n t i a l 2 1 3 X X X X