Xplore Technologies Corp. MC7750 Manual Do Utilizador
Power
Rev 4 Sep.11
Proprietary and Confidential - Contents subject to change
47
Module power states
The module has five power states, as described in
Table 6-4: Miscellaneous DC power consumption
1
Signal
Description
Current
Unit
Notes / configuration
Typ
Max
VCC
Module OFF leakage
current
current
490
830
A
Full operating temperature range
USB active current
18
25
mA
High speed USB connection, C
L
= 50 pF
on D+ and D- signals
Inrush current
750
3000
mA
•
Assumes power supply turn on time
> 100
> 100
µ
s
•
Dependent on host power supply
rise time.
rise time.
GPS signal
connector
Active bias on GPS port
3.3
(100 mA)
(100 mA)
V
GPS connector 1 in
.
1.
All measurements are preliminary values
Table 6-5: Module power states
State
Details
Host is powered
Module is powered
USB inter
fa
ce active
RF enabled
Normal
(Default
(Default
state)
•
Module is active
•
Default state when VCC is first applied in the absence of W_DISABLE_N control
•
Module is capable of placing / receiving calls, or establishing data connections on the
wireless network
wireless network
•
Current consumption is affected by several factors, including:
•
Radio band being used
•
Transmit power
•
Receive gain settings
•
Data rate
•
Number of active Tx time slots
Low power
(‘Airplane
(‘Airplane
mode’)
•
Module is active
•
State is controlled by host interface using software commands:
•
Sleep
•
Normal state of module between calls or data connections
•
Module cycles between wake (polling the network) and sleep, at network provider-
determined interval.
determined interval.