Output Signal Control Pin - Huawei MU509 Series Hardware Manual

HUAWEI MU509 Series HSDPA LGA Module
Hardware Guide
RESIN_N
The MU509 module supports hardware reset function. If the software of the MU509
module stops responding, you can reset the hardware through the RESIN_N signal as
shown in Figure 3-7 .When a low-level pulse is supplied through the RESIN_N pin for
more than 50 ms, 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 3-7 Reset pulse timing
RESIN_N

3.4.3 Output Signal Control Pin

The MU509 module provides a network status LED pin LED_STATUS and
LED_MODE. The pulse signal output through this pin controls the status LED on the
user interface board to display the network status. The LEDs are controlled by a
current sink. The high voltage is the voltage of VBAT (with the typical value of 3.8 V).
Different blinking modes of the status LED indicate different network status. Table 3-8
describes the status of the LED_STATUS pin and LED_MODE pin.
Table 3-8 The status of the LED_STATUS pin and LED_MODE pin
No.
1
2
3
4
Issue 09 (2014-03-06)
For detailed information about power supply design and printed circuit board (PCB) design, see
the HUAWEI Module Power Supply Design Guide
Design Guide.
OPEN
GND
The low-level pulse through the RESET pin cannot last for more than 2s. Otherwise, the MU509
module will be powered off.
Operating Status
The 3G network is
successfully registered.
The dial-up connection is
set up for accessing 3G
data services.
The software is being
downloaded or upgraded.
The network is being
searched for or no
network is detected.
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Copyright © Huawei Technologies Co., Ltd.
Description of the Application Interfaces
and the HUAWEI LGA Module PCB Routing
50 ms ~ 100 ms
LED_STATUS
The indicator blinks
once each time.
Light on
Light off
Light off
LED_MODE
Light off
Light off
The indicator blinks fast.
The indicator blinks
twice each time.
34