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to avoid data loss. If logging off is not done within 40s, module will shut down internal power supply
forcibly.
After that moment, the module enters the power down mode, no other AT commands can be executed,
only the RTC is still active. Please refer to document [1] for details about the AT command of
AT+QPOWD.
3.7.2.2. Emergency Shutdown
The module can be shut down by the pin PWRDWN_N. It should only be used under emergent situation.
The following table shows the pin definition of PWRDWN_N.
Table 8: PWRDWN_N Pin Description
Pin Name
Pin No.
PWRDWN_N
16
Driving the PWRDWN_N to a low level voltage at least 100ms, the module will execute power-down
procedure after PWRDWN_N is released. It is recommended to use an open drain/collector driver to
control the PWRDWN_N. The level of STATUS pin is low after UG95 is turned off. A simple reference
circuit is illustrated in the following figure.
≥ 100ms
Turn off pulse
UG95_Hardware_Design
Description
Turn off the module
4.7K
Figure 13: Turn off the Module Using Driving Circuit
Confidential / Released
UMTS/HSPA Module Series
DC Characteristics
V
max=2.1V
IH
V
min=1.3V
IH
V
max=0.5V
IL
PWRDWN_N
47K
UG95 Hardware Design
Comment
Pull-up to VRTC
internally with 4.7kΩ
resistor.
32 / 72
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