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AirPrime EM7690 Hardware Integration Guide
State
Low Power
(Airplane Mode)
Sleep
Off
Disconnected
2.2.1.
Power State Transitions
The module uses state machines to monitor supply voltage and operating temperature and notifies
the host when critical threshold limits are exceeded. (See
for state machine behavior.)
Power state transitions may occur:
Automatically, when critical supply voltage or module temperature trigger levels are encountered.
Under host control, using available AT commands in response to user choices (for example,
opting to switch to airplane mode) or operating conditions.
Table 2-3
Power State Transition Trigger Levels
Transition
Normal to Low Power
Low Power to Normal
Low Power to Normal
Or Remain in Normal
(Remove warnings)
Normal
(Issue warning)
Power off/on
(Host-initiated)
411139xx
202041113915
Module is active
Module enters this state:
Under host interface control:
Host issues AT+CFUN=0 (3GPP TS 27.007), or
Host asserts W_DISABLE#, after AT!PCOFFEN=0 has been
issued.
Automatically, when critical temperature or voltage trigger limits
have been reached)
Normal state of module between calls or data connections
Module cycles between wake (polling the network) and sleep, at
network provider-determined interval.
Host keeps module powered off by asserting Full_Card_Power_Off#
(signal pulled low or left floating)
Module draws minimal current
Host power source is disconnected from the module and all voltages
associated with the module are at 0 V.
Voltage
Trigger
V
VOLT_HI_CRIT
4.6
VOLT_LO_CRIT
2.9
VOLT_HI_NORM
4.4
VOLT_LO_NORM
3.135
VOLT_LO_WARN
3.135
-
-
Rev 0.1
Rev 0.3
Details
Table 2-3
for trigger details and
Temperature
1
Trigger
℃
TEMP_LO_CRIT
-45
TEMP_HI_CRIT
118
-30
TEMP_NORM_LO
TEMP_HI_NORM
100
TEMP_HI_WARN
100
-
-
✓
✓
✓
-
✓
-
-
-
Figure 2-1
Notes
RF activity suspended
RF activity resumed
In the TEMP_HI_WARN state, the
module may have reduced
performance (Class B temperature
range).
Power off recommended when
supply voltage or module operating
temperature is critically low or high.
September 23,
September 23, 2020
Power
-
-
-
-
7
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