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.
30
Pin
No.
Pin Name
I/O Description
DC Characteristics (V)
Min
Typical Max
24
USB_ DM
I/O
USB data signal D-
-
-
-
32
USB_VBUS P
Power supply for USB
-
3.3/5
-
According to USB protocol, for bus timing or electrical characteristics of MU739 USB
signal, please refer to the chapter 7.3.2 of
Universal Serial Bus Specification 2.0.
Figure 3-14
Recommended circuit of USB interface
The layout design of this circuit on the AP board should comply with the USB 2.0 high speed
protocol, with differential lining and impedance control to 90 ohm.
It is recommended that set USB_DP and USB_DM pins as test points and then place these
test points on the AP for debug.
You don’t need to connect the USB_VBUS when the function of USB is not used.
3.6 USIM Card Interface
3.6.1
Overview
The MU739 module provides a USIM card interface complying with the ISO 7816-3
standard and supports automatic detection of a 3.0 V USIM card or a 1.8 V USIM card.
Table 3-7 lists the USIM card interface signals.
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