Product Info

LTE-A Module Series
EG12 Hardware Design
EG12_Hardware_Design 40 / 100
Another way to control the PWRKEY is using a button directly. When pressing the key, electrostatic strike
may generate from fingers. Therefore, it is necessary to place a TVS component nearby the button for
ESD protection. A reference circuit is shown in the following figure:
PWRKEY
S1
Close to S1
TVS
Figure 12: Turn on the Module Using a Button
The turn-on scenario is illustrated in the following figure.
V
IL
≤0.5V
V
IH
≥1.3V
VBAT
PWRKEY
≥500ms
RESET_N
STATUS
Inactive
Active
UART
NOTE
Inactive
Active
USB
≥11.5s
≥13s
≥14s
Figure 13: Timing of Turning on Module
Please ensure that VBAT is stable for no less than 30ms before pulling down the PWRKEY.
NOTE