HUAWEI MU736 HSPA+ M.2 Module
Hardware Guide
Description of the Application Interfaces
Issue 05 (2014-01-14)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
22
3.4.2
Power_On_Off Control Pin
The MU736 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
MU736 is powered on.
NOTE: If MU736 needs to be powered on automatically, the
Power_On_Off pin must be pulled up to 3.3 V.
2
Low
MU736 is powered off.
It is internally pulled to low.
MU736 is powered by regulated 3.3 V
If MU736 is powered by 3.3 V voltage regulator (such as notebook or Ultrabook),
Power_On_Off pin should be pulled up to 3.3 V through a resistor.
The pull-up resistor should be
not larger than 10 k
Ω
.
The following are the power On/Off sequences:
1.
The module gets 3.3 V when power supply for the module is switched on.
2.
The module is turned on since Power_On_Off pin is pulled up directly to 3.3 V.
3.
Host cuts off 3.3V supply to power off the module.
The recommended circuit is shown as in Figure 3-5 .
Figure 3-5
Recommended connections of Power_On_Off pins (Auto power)
Power on sequence
Do not toggle RESET# pin during the power on sequence. Pulling RESET# pin low
will extend time for module startup.
Recommended power on timing is shown as in Figure 3-6 .
MU736
Pin 2, 4, 70, 72, 74
Pin 6
10 k
Ω
Power_On_Off
3.3V