Huawei ME909 Series - Power-On;Off (POWER_ON_OFF) Pin

HUAWEI ME909 Series LTE LGA Module
Hardware Guide
Description of the Application Interfaces
Issue V0.3 (2013-05-21)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
25
Table 3-3 Definitions of the pins on the signal control interface
Pin
No.
Pin Name
I/O
Description
DC Characteristics (V)
Min.
Typ.
Max.
81
POWER_ON_OFF
I
Pin for controlling power-on and
power-off
Pulled up
on module
100
RESIN_N
I
Pin for resetting the system
–0.3
1.8
2.1
11
WAKEUP_IN
I
H: Sleep mode is disabled
L: Sleep mode is enabled (default
value)
–0.3
1.8
2.1
71
WAKEUP_OUT
O
Module to wake up the host.
H: Wake up the host, the module
hold 1s high-level-voltage pulse
and then output low-level-voltage.
L: Do not wake up the host
(default value).
–0.3
1.8
2.1
15
SLEEP_STATUS
O
Indicates sleep status of ME909
H: ME909 is in wakeup state.
L: ME909 is in sleep state.
–0.3
1.8
2.1
101
LED_MODE
O
Mode indicator
Current sink
Drive strength: 10 mA
Under development.
-
-
-
3.4.2 Power-on/off (POWER_ON_OFF) Pin
The ME909 module can be controlled to be powered on/off by the Power_On_Off pin.
Table 3-4 Two states of Power_On_Off
Item.
Pin state
Description
1
Low (when ME909 is
in power off state.)
ME909 is powered on.
POWER_ON_OFF pin should be pulled down
for 0.5s to 1.0s.
2
Low (when ME909 is
in power on state.)
ME909 is powered off.
POWER_ON_OFF pin should be pulled down
for 3.0s to 5.0s.
So POWER_ON_OFF pin cannot be fixed to a low state. Pull-up resistor is never
needed for this pin.