Specifications

AirPrime Embedded Module Hardware Integration Guide
26 Proprietary and Confidential 2130114
Figure 2-6: Power-up timing diagram
Note: Startup time is the time after power-up when the modem is ready to begin the
enumeration sequence.
Transmit power wave form (GSM)
As shown in Figure 2-7, at maximum GSM transmit power, the input current can
remain at 2.4 A for up to 25% of each 4.6 ms GSM cycle (1.15 ms). For Class 12
operation, the peak could remain for 2.3 ms (four timeslots).
The 2.4 A current draw is for 50 ohm systems (1:1 VSWR). For worst-case
antenna designs, such as 3.5:1 VSWR (as stated in Ta bl e 2- 7 on page 31), this
current draw could increase from 2.4 A to 2.75 A, as shown in the diagram.
Beyond the 3.5:1 VSWR as recommended to be worst-case in Tabl e 1 - 4 on
page 95, the current draw could increase beyond 2.75 A to 3.5 A.
At maximum GSM transmit power, the input current can remain at 2.4 A for up to
25% of each 4.6 ms GSM cycle (1.15 ms) after initially reaching a peak of 2.75 A
average over 100 µs and with an instantaneous peak current of 3.5 A.
Figure 2-7: GSM transmit power wave form
Current consumption
Current consumption depends on the module’s operating mode at any given time.
This section describes:
• Current consumption for both module types (MC57xx and MC8xxx)
• Operating modes
Enumeration
3.3V
3.8V (MC8201)
W_Disable#
USB D+
Startup time
2.4
0.15
Current
(A)
2.75A peak
2.75
25 µs
1.15 ms
4.6 ms
3.5:1 VSWR = 2.75A
1:1 VSWR = 2.40A