Huawei MC509 CDMA LGA manual 10DC Electrical Characteristics of USB, VOHmin VOLmax VIHmin VILmax

Models: MC509 CDMA LGA

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HUAWEI MC509 CDMA LGA Module

 

Hardware Guide

Description of the Application Interfaces

The USB interface is powered directly from the 3.3 V supply. The USB input/output lines are compatible with the USB 2.0 3.3 V signal specifications.

Table 3-10DC Electrical Characteristics of USB

VOHmin

VOLmax

VIHmin

VILmax

 

 

 

 

2.8V

0.3V

2V

0.8V

 

 

 

 

Figure 3-8Recommended circuit of USB interface

Since the USB interface of MC509 module supports USB 2.0 full speed, the resistance “RV102 and RV103” in the 0must be Voltage Sensitive Resistor with small capacitance (ALVC18S02003 manufactured by AMOTECH or B72590T7900V60 manufactured by EPCOS is recommended.). In addition, The layout design of this circuit on the DTE board should comply with the USB 2.0 full speed protocol, with differential lining and impedance control to 90 ohm

It is recommended that set USB D+ and USB D- pins as test points and then place these test points on the DTE for debug.

Issue 01 (2011-04-08)

Huawei Proprietary and Confidential

34

Copyright © Huawei Technologies Co., Ltd.

 

 

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Huawei MC509 CDMA LGA manual 10DC Electrical Characteristics of USB, VOHmin VOLmax VIHmin VILmax