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HUAWEI MU739 HSPA+ LGA Module
Development Board Guide
2.3 Interface Functions
2.3.1 Power Interface and Power Supply Mode
The power interface (as red circle 1 in Figure 2-1 ) on the DVK development board
supplies power to the development board and the module.
Power can be supplied to the DVK development board in two modes: by an AC-DC 5
V output power adapter or by the USB 5 V power supply. You can use the jump J103
(as red circle 2 in Figure 2-1 ) to select a power supply mode. When pin 1 and pin 2
are connected, the USB VBUS power supply is used; when pin 2 and pin 3 are
connected, the 5 V AC-DC power adapter is used. Only one mode can be selected at
a time.
2.3.2 USB Communications Interface
The DVK development board provides a mini USB B-type connector (as red circle 3
in Figure 2-1 ). The connector implements communications between the module and
a personal computer (PC) or other data terminal equipment (DTE).
2.3.3 JATG Interface
The JTAG interface (as red circle 7 in Figure 2-1 ) is used by the debugging tool to
load software into the module. The JTAG interface is not provided for the user.
2.3.4 Serial Communications Interface
The DVK development board provides a DB9 female connector (as red circle 10 in
Figure 2-1 ), it is a standard RS-232 serial communication interface, which supports
4-wire serial communication and can be connected to a PC or other DTE through a
RS-232 serial cable. The serial communications interface is used for Huawei internal
debug and cannot be used by customer.
2.3.5 Buttons
The DVK development board has two buttons: the reset button S401 (as red circle 14
in Figure 2-1 ) and the reserved high-level start button S402 (as red circle 13 in
Figure 2-1 ).
The reset button S401 (marked as "Reset" on the development board) is used to
reset the module. The reset signal of the module is at low level when the button is
pressed.
The module reserves the high-level start button S402 (marked as "Turn_on" on the
development board). MU739 supports high-level start, so reserve this button to
control the module start. The button cannot be used by customer.
For details about power on or off the module, see the
Module Hardware Guide.
2.3.6 SIM Card Interface
The DVK development board provides a standard SIM card interface marked as
"J302" (as red circle 15 in Figure 2-1 ) on the development board.
Issue 01 (2011-12-28)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
Overview of the DVK
HUAWEI MU739 HSPA+ LGA
9
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