AirPrime EM7700 Hardware Integration Guide
10
Proprietary and Confidential
4112206
Module power states
The module has five power states, as described in
Table 2-1
.
Table 2-1: Module power states
State
Details
Host i
s
p
o
wered
Module is powere
d
USB inter
fac
e active
RF enabled
Normal
(Default
state)
•
Module is active
•
Default state. Occurs when VCC is first applied, POWER_ON is asserted (pulled
high), and WWAN_DISABLE_N is deasserted
•
Module is capable of placing/receiving calls, or establishing data connections on the
wireless network
•
Current consumption is affected by several factors, including:
•
Radio band being used
•
Transmit power
•
Receive gain settings
•
Data rate
Low power
(‘Airplane
mode’)
•
Module is active
•
State is controlled by host interface using software commands:
•
+CFUN=0 (
[1] AT Command Set for User Equipment (UE) (Release 6)
(Doc# 3GPP TS 27.007)
))
Sleep
•
Normal state of module between calls or data connections
•
Module cycles between wake (polling the network) and sleep, at network provider-
determined interval.
Off
•
Host keeps module powered off by deasserting POWER_ON (signal left floating or
tied low)
•
Module draws minimal current
Disconnected
•
Host power source is disconnected from the module and all voltages associated with
the module are at 0 V.
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