User's Manual

Rev 2 Feb.13 Proprietary and Confidential - Contents subject to change 9
2
2: Power
Power supply
The host provides power to the EM7355 through multiple power and
ground pins. The host must provide safe and continuous power (via
battery or a regulated power supply) at all times; the module does not
have an independent power supply, or protection circuits to guard
against electrical issues.
For detailed pinout and voltage / current requirements of this module,
se
e the AirPrime EM7355 Product Technical Specification &
Customer Design Guidelines.
Module power states
The module has five power states, as described in Ta bl e 2 - 1 .
Table 2-1: Module power states
State Details
Host is powered Module is powered USB interface active RF enabled
Normal
(Default
state)
• Module is active
• Default state. Occurs when VCC is first applied, Full_Card_Power_Off# is
deasserted (pulled high), and W_DISABLE#1 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
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Low power
(‘Airplane
mode’)
• Module is active
• Module enters this state:
• Under host interface control:
· Host issues AT+CFUN=0 ([1] AT Command Set for User Equipment (UE)
(Release 6) (Doc# 3GPP TS 27.007))), or
· Host asserts W_DISABLE#1, after AT!PCOFFEN=0 has been issued.
• Automatically, when critical temperature or voltage trigger limits have been
reached))
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