Power_On_Off Control Pin - Huawei MU736 Hardware Manual

HUAWEI MU736 HSPA+ M.2 Module
Hardware Guide

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
1
2
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 kΩ.
The following are the power On/Off sequences:
1.
2.
3.
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 .
Issue 05 (2014-01-14)
Description
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.
Low MU736 is powered off.
It is internally pulled to low.
The module gets 3.3 V when power supply for the module is switched on.
The module is turned on since Power_On_Off pin is pulled up directly to 3.3 V.
Host cuts off 3.3V supply to power off the module.
MU736
Pin 2, 4, 70, 72, 74
Power_On_Off
Pin 6
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Description of the Application Interfaces
3.3V
10 kΩ
22