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HUAWEI ME909 Series Mini PCIe Module
Hardware Guide
Description of the Application Interfaces
Issue 0.1 (2013-06-09)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
18
3.7 W_DISABLE# Signal
The W_DISABLE# signal is provided to allow users to disable wireless
communications of the module.
The software version is planning.
3.8 LED_WWAN# Signal
ME909 provides a LED_WWAN# signal to indicate the RF status.
The ME909 module does not support this function because the software feature is
under development. The planning drive strength is10 mA.
External Circuits
Figure 3-7 shows the recommended circuits of the LED_WWAN# pin. According to
LED feature, you can adjust the LED brightness by adjusting the resistance of resistor
R.
Figure 3-7 Driving circuit
3.9 USB Interface
The ME909 module is compliant with USB 2.0 protocol. The USB interface is powered
directly from the VBAT supply. The USB input/output lines are compatible with the
USB 2.0 signal specifications. Figure 3-8 shows the circuit of the USB interface.