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Xplore Technologies Corp. MC7750 Manual Do Utilizador

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Product Technical Specification & Customer Design Guidelines
48
Proprietary and Confidential - Contents subject to change
2400074
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.
Off
•
Host keeps module powered off by driving W_DISABLE_N low
•
Module draws minimal current
•
See 
 on page 33 for more information.]
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.
1.
Module-reported temperatures at the printed circuit board.
2.
Supply  voltage — 3.3V