Usb Interface - Huawei MU509-65 HSDPA Hardware Manual

HUAWEI MU509-65 HSDPA LGA Module
Hardware Guide

3.6 USB Interface

The MU509-65 is compliant with USB 2.0 full speed protocol. Figure 3-19 shows the
circuit of the USB interface.
Table 3-10 Definition of the USB interface
Pin
Pin Name
No.
85 USB_DM
86 USB_DP
According to USB protocol, for bus timing or electrical characteristics of MU509-65
USB signal please refer to the chapter 7.3.2 of
Figure 3-19 Recommended circuit of USB interface
Issue 01 (2016-04-08)
It is recommended to set the pins related to UART interface as test points on the DTE board

for debugging.
The maximum level of UART interface signals is 2.9 V. If these signals are connected to a

host with 3.3 V level, a level conversion circuit is required.
 Make sure that the level of the UART signals are 0 V before MU509-65 module is powered
on to avoid the wind blow in which may cause the module cannot work properly.
 The level of RS-232 Transceivers must match that of the MU509-65 module.
Regardless of the connection modes, when there is no data transmitted on the UART, the

host should set the RX pin of the module's UART to low level so that the module can enter
sleep mode. Otherwise, UART always votes to stop the module from entering sleep mode.
Pad
Description
Type
USB Data –
I/O
I/O USB Data +
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Description of the Application Interfaces
Parameter Min. (V)
- -
- -
Universal Serial Bus Specification 2.0.
Typ. (V) Max. (V)
- -
- -
36