Quectel EG25-G - Figure 11: Turn on the Module by Using Keystroke

LTE Module Series
EG25-G Hardware Design
EG25-G_Hardware_Design 37 / 100
The other way to control the PWRKEY is using a button directly. When pressing the key, electrostatic
strike may generate from 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.
PWRKEY
S1
Close to S1
TVS
Figure 11: Turn on the Module by Using Keystroke
The power-on scenario is illustrated in the following figure.
V
IL
≤0.5V
V
IH
≥1.3V
VBAT
PWRKEY
≥500ms
RESET_N
STATUS
(OD)
Inactive
Active
UART
NOTE
Inactive
Active
USB
≥2.5s
≥12s
≥13s
VDD_EXT
About 100ms
BOOT_CONFIG &
USB_BOOT
≥100ms. Ater this time, the BOOT_CONFIG
pin can be set high level by external circuit.
Figure 12: Power-on Scenario of Module