Huawei Technologies Co. Ltd UM01-HW Manuel D’Utilisation
MC703 CDMA EV-DO Wireless Module V100R001
Product Description
Issue 1.00 (2009-9-10)
Huawei Proprietary and Confidential
Page 21 of 40
3.5.3 Power-on, Power-off, and Reset Processes
When the voltage of the power supplied to the UM01-HW UMTS module is higher than 3.3 V
and the TERM_ON pin is driven low for at least 300 ms, the UM01-HW UMTS module can
be powered on. Figure 3-1 shows the power-on process of the UM01-HW UMTS module.
and the TERM_ON pin is driven low for at least 300 ms, the UM01-HW UMTS module can
be powered on. Figure 3-1 shows the power-on process of the UM01-HW UMTS module.
Figure 3-1 Power-on process of the UM01-HW UMTS module
If the power supply with the lower voltage (for example 3.3 V) is used, the antenna interfaces
need to be configured. The cable connecting the external power supply and the module should
be as short as possible and the power supply input should be configured with a capacitor of
higher than 1000 µF. Otherwise, the voltage that is actually imported to the UM01-HW
UMTS module may be lower than 3.3 V, resulting in the deterioration of RF indicators and
unstable operation of the UM01-HW UMTS module.
need to be configured. The cable connecting the external power supply and the module should
be as short as possible and the power supply input should be configured with a capacitor of
higher than 1000 µF. Otherwise, the voltage that is actually imported to the UM01-HW
UMTS module may be lower than 3.3 V, resulting in the deterioration of RF indicators and
unstable operation of the UM01-HW UMTS module.
The power-off process is classified into normal power-off and urgent power-off.
Normal power-off
An external CPU drives the TERM_ON pin low for more than 0.5s. Then, the UM01-HW
UMTS module is normally powered off. During the normal power-off process, the
UM01-HW UMTS module can save information and log out of the network.
UMTS module is normally powered off. During the normal power-off process, the
UM01-HW UMTS module can save information and log out of the network.
Figure 3-2 shows the normal power-off process.