UMTS/HSPA Module Series
UG95 Hardware Design
UG95_Hardware_Design Confidential / Released 30 / 72
The other way to control the PWRKEY is using a button directly. A TVS component is indispensable to be
placed nearby the button for ESD protection. When pressing the key, electrostatic strike may generate
from finger. A reference circuit is shown in the following figure.
PWRKEY
S1
Close to S1
TVS
Figure 10: Turn on the Module Using Keystroke
The turn on scenarios is illustrated as the following figure.
V
IL
≤ 0.5V
V
IH
≥ 1.3V
VBAT
PWRKEY
(Input)
≥ 100ms
OFF
BOOTING
Module
Status
RUNNING
1
≥ 3.5s
RESET_N
STATUS
>2.3s
Figure 11: Timing of Turning on Module
①
Make sure that VBAT is stable before pulling down PWRKEY pin, the recommended delay time is at
least 30ms. It is not suggested that PWRKEY pin is always pulled down.
NOTE
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