HUAWEI MU739 HSPA+ LGA Module
Hardware Guide
Description of the Application Interfaces
Issue 01 (2011-08-24)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
20
3.3 Power Interface
3.3.1
Overview
The power supply part of the MU739 module contains:
VBAT PIN for the power supply
SIM_VCC PIN for USIM card power output
USB_VBUS PIN for USB power supply
VCC_EXT1 PIN for 1.8 V power output
VCC _IN PIN for 41~46 PIN voltage supply
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
I/O Description
DC Characteristics (V)
Min
Typical Max
49
VBAT_PMU
P
Battery supply,
power supply for
Baseband and
Transceiver
3.3
3.8
4.2
51, 52
VBAT_PA
P
Battery supply,
power supply for PA
3.3
3.8
4.2
20
SIM_VCC
P
Power supply for
USIM card
-
1.8/2.9
-
32
USB_VBUS P
Power supply for
USB
-
3.3/5
-
38
VCC_EXT1 P
1.8 V power output
1.7
1.8
1.9
40
VCC _IN
P
1.8 V power input
-
1.8
-
62~64,
66~68,70,
71, 73,74,
79~114
GND
-
Ground
-
0
-
3.3.2
VBAT Interface
When the MU739 module works normally, power is supplied through the VBAT_PMU
and VBAT_PA pins and the voltage ranges from 3.3 V to 4.2 V (typical value is 3.8 V).
The 114-pin LGA module provides one VBAT_PMU pin, two VBAT_PA pins and
forty-six GND pins. To ensure that the MU739 module works normally, all the pins
must be connected.
When the MU739 module is used for different applications, special attention should be
paid to the design of the power supply. When the MU739 module transmits at the
maximum power, the transient peak current may reach 2.0 A. In this case, the
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