Reset# Pins - Huawei MU736 Hardware Manual

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HUAWEI MU736 HSPA+ M.2 Module

Hardware Guide

3.4.3 RESET# Pins

The MU736 module can be reset through the RESET# pin asynchronous, active low.

Whenever this pin is active, the module will immediately be placed in a Power On

reset condition. Care should be taken for this pin unless there is a critical failure and

all other methods of regaining control and/or communication with the WWAN

sub-system have failed.

Pulling RESET# pin low for more than 20 ms will reset the module.

RESET# pin is optional, which cannot be connected. Pulling Power_On_Off pin low

for more than 500 ms can work as a reset.

RESET# pin is internally pulled up to 1.8 V, which is automatically on when 3.3 V is

applied even though Power_On_Off pin is low. Cautions should be taken on circuit

design otherwise there may be back driving issue.

Option 1: Hardware circuit for RESET#

In this case, the GPIO is high-impedance when the module is powered off.

Figure 3-12 Hardware circuit for RESET# (Option 1)

Option 2: Hardware circuit for RESET#

In this case, the GPIO is not high-impedance when It is powered off.

Use 2 NMOSFET so that the logic of RESET# pin and GPIO are the same.

Issue 05 (2014-01-14)

MU736

RESET#

Pin 67

33 рF

GPIO1 should be high-impedance

when it is powered off.

Huawei Proprietary and Confidential

Description of the Application Interfaces

0 Ω

HOST

GPIO1

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