Huawei ME906s LTE M.2 - Power_On_Off Control Pin

HUAWEI ME906s LTE M.2 Module
Hardware Guide
Description of the Application Interfaces
Issue 05 (2019-03-25)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
23
Pin
No.
Pin Name
Pad
Type
Description
Parameter
Min.
(V)
Typ.
(V)
Max.
(V)
Comments
25
BodySAR_N
I
Hardware pin for BodySAR
Detection.
When it is High, No TX
power backoff (default).
When it is Low, TX power
backoff.
V
IH
1.26
-
3.6
-
V
IL
–0.3
-
0.3
66
USIM_DET
I
USIM hot swap detection
pin.
Rising edge for insertion;
falling edge for removal.
When it is High, USIM is
present.
When it is Low, USIM is
absent.
V
IH
1.26
1.8
2.1
The
module is
pulled up
inside.
V
IL
–0.3
-
0.3
3.4.2 Power_On_Off Control Pin
The ME906s 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
High
The module is powered on.
NOTE: If the module needs to be powered on
automatically, the Power_On_Off pin must be pulled up
to 3.3 V.
2
Low
The module is powered off.
It is internally pulled low with a weak pull-down resistor.
If the module is powered by the regulator with 3.3 V
If ME906s is powered by 3.3 V voltage regulator (such as notebook or Ultrabook),
Power_On_Off should be pulled up to 3.3 V through a resistor.
The pull-up resistor should be not greater than 47 kΩ.
Following is the power on/off sequence:
1. The module gets 3.3 V when supply for the module is switched on.
2. The module is turned on since Power_On_Off is pulled up to 3.3 V by the host.
3. Host cuts off 3.3 V supply to power off the module.
The recommended circuit is shown as in Figure 3-4 .