W_Disable# Signal; Led_Wwan# Signal - Huawei MU609 Hardware Manual

HUAWEI MU609 HSPA Mini PCIe Module
Hardware Guide
 As the RESIN_N signal is relatively sensitive, it is recommended that you install a
10 nF–0.1 µF capacitor near the RESIN_N pin of the interface for filtering. In
addition, when you design a circuit on the PCB of the interface board, it is
recommended that the circuit length should not exceed 20 mm and that the circuit
should be kept at a distance of 2.54 mm (100 mil) at least from the PCB edge.
Furthermore, you need to wrap the area adjacent to the signal wire with a ground
wire. Otherwise, the module may be reset due to interference.

The maximum Forward Voltage Drop of the diode used in the module is 0.6 V. So
when the host wants to reset the module, the low-level-voltage in the RESIN_N pin
should below 50 mV.
The MU609 module supports hardware reset function. If the software of the MU609
module stops responding, you can reset the hardware through the RESIN_N signal as
shown in Figure 3-6 . When a low-level pulse is supplied through the RESIN_N pin,
the hardware will be reset. After the hardware is reset, the software starts powering on
the module and reports relevant information according to the actual settings. For
example, the AT command automatically reports ^SYSSTART.
Figure 3-6 Reset pulse timing

3.4.3 W_DISABLE# Signal

The W_DISABLE# signal is provided to allow users to disable wireless
communications of the module.
T he software version is planning .

3.4.4 LED_WWAN# Signal

MU609 provides a LED_WWAN# signal to indicate the work status.
Table 3-4 State of the LED_WWAN# pin
No.
1
Issue 03 (2014-12-04)
 The RESIN_N pin must not be pulled down for more than 1s.
 The RESIN_N pin is optional, which can be not connected.
Operating Status
No service/Restricted service
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Copyright © Huawei Technologies Co., Ltd.
Description of the Application Interfaces
LED_WWAN#
Outputs: low(0.1s)-high (0.1s)-low
(0.1s)-high (1.7s)
2s cycle
21