HUAWEI MU709 Series HSPA+ LGA Module
Hardware Guide
Description of the Application Interfaces
Issue 09 (2017-12-15)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
34
The RS-232 chip (must support 921600 bit/s) can be used to connect the MU709
module with UART0. In this connection, the Complementary Metal Oxide
Semiconductor (CMOS) logic level and the Electronic Industries Association (EIA)
level are converted mutually.
The UART0 cannot wake up the module from the sleep status, and you can pull up the
WAKE_IN signal for 1s instead.
The level of RS-232 transceivers must match that of the MU709 module.
3.6 USB Interface
The MU709 module is compliant with USB 2.0 high speed protocol. The USB interface
is powered directly from the VBAT supply. The USB signal lines are compatible with
the USB 2.0 signal specifications. Figure 3-13 shows the circuit of the USB interface.
Table 3-9
Definition of the USB interface
Pin
No.
Pin Name
Pad
Type
Description
Parameter
Min.(
V)
Typ.(
V)
Max.(
V)
85
USB_DM
I/O
USB Data- defined in the
USB 2.0 Specification
-
-
-
-
86
USB_DP
I/O
USB Data+ defined in the
USB 2.0 Specification
-
-
-
-
According to USB protocol, for bus timing or electrical characteristics of MU709 USB
signal, please refer to the chapter 7.3.2 of
Universal Serial Bus Specification 2.0
.
Figure 3-13
Recommended circuit of USB interface
