Sierra Wireless MC5720, Hardware Integration Manual, Page: 13 / 30

Power Interface
Rev 0.92 Nov.05 11
Normal state
Note: This is the default state
when VCC3.3 is first applied in
the absence of W_Disable#
control.
This is the active state of the module. While in this state:
•
The module is fully powered.
•
The module is capable of placing/receiving calls or estab ‐
lishing data connections on the wireless network.
•
The USB interface is fully active.
Low power mode
In this power state, RF (both Rx and Tx) is disabled in the
module, but the USB interface is still active. This low power
mode ( ʺ airplane mode ʺ ) is controlled by a software command
through the host interface.
For instructions on using appropriate commands, refer to AT
Command Set for User Equipment (UE) (Release 6) (+CFUN=0
command) , EM5625/MC5720 CnS Reference (Document 2130643)
(CNS_RADIO_POWER [0x1075]) , or MC87xx Modem CnS
Reference (Document 2130602) (Disable Modem) .
Usage models
Usage models can be used to calculate expected current
consumption. A sample usage model is provided in Table 2 ‐ 1.
This example model applies to a battery ‐ operated device. In
practice, because the module will be isolated from the battery
(the host device manages the power source), the mAh ratings
will depend on the device’s supply efficiency.
Table 2-1: Power consumption of a sample application
Used by a field worker
(data only)
Used for remote data
logging
Upload
(module Tx) 1000 kB/day 40 kB/h
Download
(module Rx) 500 kB/day 100 kB/day
Coverage /
data rate 1X / 80 kbps IS-95 / 14.4 kbps
Hours of
operation 8 / day (off 16 hrs / day) 24 / day
Total power
consumed
over 24 hours 60 mAh 200 mAh