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HUAWEI ME909u-521 LTE LGA Module
Application Guide
Sleeping and Waking Up Application Scenarios
Issue 01 (2013-07-05)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
52
8.1 Hardware Interfaces
The module communicates with the host using mainly USB or UART. For details
about pins related to power management, see Table 8-1 .
For corresponding interface numbers and reference design for the pins, see
Hardware Guide for each product.
Table 8-1 Power management related pins
Interface
Pin name
Direction
Functional Description
Diagram
PCIE
WAKE#
Output
When a wake-up source arrives, this
pin output a low-level-voltage pulse
lasting for 1s during which if other
wake-up sources arrive, the module
will ignore the later wake-up requests.
In other words, the module will not
output a second pulse during this 1s.
Figure 8-1
LGA
WAKEUP_OUT
Output
When a wake-up source arrives, this
pin output a high-level-voltage pulse
lasting for 1s during which if other
wake-up sources arrive, the module
will ignore the later wake-up requests.
In other words, the module will not
output a second pulse during this 1s.
Figure 8-2
LGA
WAKEUP_IN
Input
When the pin carries a high-level
voltage, the states of the module are
as follows:
The module will be prohibited to enter
sleep mode if the module is awake.
The module will be woken up if the
module is in sleep mode.
When the pin carries a low-level
voltage, the module is allowed to enter
sleep mode. (By default, the pin is set
to INPUT/PD, which is, the software
detects a low-level voltage on the pin
when the pin is not connected.)
Figure 8-3
LGA
SLEEP_STATUS
Output
Indicate the state of the module.
When the pin carries a high-level
voltage, the module is in working
mode. When the pin carries a low-
level voltage, the module is in sleep
mode.
Figure 8-4
Note:
The PCIE interface does not support UART.