Usb Interface - Huawei MC509 Series Hardware Manual

HUAWEI MC509 Series CDMA LGA Module
Hardware Guide
Figure 3-14 Connection of the UART interface in the MC509 module (DCE) with the
host (DTE)

3.6 USB Interface

The MC509 is compliant with USB 2.0 full speed protocol. 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. Figure 3-15 shows the circuit of the USB
interface.
Table 3-8 USB interface signals
Pin No.
86
85
Issue 02 (2013-05-06)
 For detailed application of the MC509 UART interface, see the
Serial Port Design Guide.
 It is recommended that set the pins related to UART interface as test points on the DTE for
debug.
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 MC509 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 MC509 module.
Pin Name
USB_DP
USB_DM
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Description of the Application Interfaces
I/O Description
I/O USB data signal D+
I/O USB data signal D-
HUAWEI Module UART
DC Characteristics (V)
Min. Typ. Max.
- - -
- - -
36