Product Technical Specification & Customer Design Guidelines
52
Proprietary and Confidential - Contents subject to change
2400089
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 trigger details and
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.
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 driving W_DISABLE_N low
•
Module draws minimal current
•
See
W_DISABLE_N and GPS_EN_N — Wireless disable on page 36
for more infor-
mation.]
Disconnected
•
Host power source is disconnected from the module and all voltages associated with
the module are at 0 V.
Table 6-5: Module power states (Continued)
State
Details
H
o
st is power
ed
Module is powered
U
S
B interface
a
c
tive
RF ena
b
le
d
Table 6-6: Power state transitions (including voltage / temperature trigger levels)
Transition
Voltage
Temperature
1
Notes
Trigger
V
2
Trigger
°
C
Normal to Low Power
VOLT_HI_CRIT
3.6
TEMP_LO_CRIT
-25
•
RF activity suspended
VOLT_LO_CRIT
2.9
TEMP_HI_CRIT
95
Low Power to Normal
VOLT_HI_NORM
3.5
TEMP_NORM_LO
-15
•
RF activity resumed
Low Power to Normal
or
Remain in Normal
(Remove warnings)
VOLT_LO_NORM
3.1
TEMP_HI_NORM
80
Normal (Issue warning)
VOLT_LO_WARN
3.0
TEMP_HI_WARN
85
Power off / on
(Host-initiated)
-
-
-
-
•
Power off recommended when
supply voltage or module
operating temperature is critically
low or high.
