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HUAWEI MU736 HSPA+ M.2 Module
Hardware Guide
3.3 Power Interface
3.3.1 Overview
The power supply part of the MU736 module contains:
Table 3-2 lists the definitions of the pins on the power supply interface.
Table 3-2 Definitions of the pins on the power supply interface
Pin No.
Signal
Name
2, 4, 70, 72, 74
3.3V
36
UIM_PWR
3, 5, 11, 27, 33,
Ground
39, 45, 51, 57,
71, 73
3.3.2 Power Supply 3.3V Interface
When the MU736 module works normally, power is supplied through the 3.3V pins
and the voltage ranges from 3.135 V to 4.4 V (typical value is 3.3 V). The MU736
provides 5 power pins, and 11 Ground pins. To ensure that the MU736 module works
normally, all the pins must be connected. The M.2 connector pin is defined to support
500 mA/Pin continuously.
When the MU736 module works at 2G mode, the module transmits at the maximum
power, the transient peak current may reach 2.5 A. In this case, the power pin voltage
will drop. Make sure that the voltage does not drop below 3.135 V in any case. The
traces of the power supply should be as short and wide as possible. It is
recommended that at least a 220 µF capacitance is added onto the 3.3 V power rails
and as close to the M.2 connector as possible. Customer can reduce the capacitance
if it can be guaranteed that 3.3V pin does not drop below 3.135 V in any case.
Figure 3-2 shows the recommended power circuit of the MU736 module.
Issue 05 (2014-01-14)
3.3V pins for the power supply
UIM_PWR pin for USIM card power output
I/O
Description
PI
Power supply for MU736,
3.3 V is recommended
Power supply for USIM card –0.3
PO
PI
Ground
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
Description of the Application Interfaces
DC Characteristics (V)
Min.
Typ.
3.135
3.3
1.8/2.85
-
0
Max.
4.4
1.98/3.3
-
18
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