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HUAWEI EM820W HSPA+ PC Embedded Module
Hardware Guide Description of the Application Interfaces
Issue 01 (2010-12-31)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
5
3 Description of the Application Interfaces
3.1 About This Chapter
This chapter mainly describes the external application interfaces of the EM820W
module, including:
z
Mini PCI Express Interface
z
Power Sources and Grounds
z
Power Supply Time Sequence
z
USB Signals
z
USIM Signals
z
W_DISABLE# Signal
z
LED_WWAN# Signal
z
WAKE_NB_N Signal
z
NC Pins
3.2 Mini PCI Express Interface
The EM820W has a standard Mini PCI Express interface, which consists of several
major signals, as shown in the following table.
Table 3-1 Pin definitions of the Mini PCI-E Interface
Definition of the EM820W Mini PCI Express pins
Pin
No.
Mini PCI
Express
Standard
Description
HUAWEI Pin
Description
Additional
Description
Direction to
Module
1
WAKE# WAKE_NB_N Open collector active
low signal. This signal
is used to wake up the
host.
Output