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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.
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Figure 3-5 LED typical electro-optical characteristics curves
3.9 WAKE_NB_N Signal
WAKE_NB_N (signal that the module uses to activate the PC)
Support software controls the signal (WAKE_NB_N) that the module uses to activate
the PC
. This signal is used for 3G module to wake up the host. It’s designed as a
OC gate, so it should be pulled up by the host and it’s active-low.
3.10 NC Pins
The NC pins are not internally connected in the EM820W.