UMTS/HSPA Module Series
UG96 Hardware Design
UG96_Hardware_Design 32 / 76
Table 8: Pin Definition of PWRDWN_N
Pin Name
Pin No.
Description
DC Characteristics Comment
PWRDWN_N
16
Turn off the module
V
IH
max=2.1V
V
IH
min=1.3V
V
IL
max=0.5V
Pull-up to VRTC
internally with 4.7K
Ω
resistor.
Drive the PWRDWN_N to a low-level voltage for 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 UG96 is turned off. A simple reference
circuit is illustrated in the following figure.
Turn off pulse
PWRDWN_N
4.7K
47K
≥
100ms
Figure 13: Turn off the Module Using Driving Circuit
Another way to control the PWRDWN_N is using a button directly. When pressing the key, electrostatic
strike may generate from the finger. Therefore, a TVS component is indispensable to be placed nearby
the button for ESD protection. A reference circuit is shown in the following figure.
PWRDWN_N
S2
Close to S2
TVS
Figure 14: Turn off the Module Using Keystroke