Product Info

LTE Standard Module Series
EG95 Series Hardware Design
EG95_Series_Hardware_Design
39 / 99
The other way to control the PWRKEY 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.
S1
PWRKEY
TVS
Close to S1
Figure 11: Turn on the Module by Using Keystroke
The power-on scenario is illustrated in the following figure.
NOTE 1
VBAT
PWRKEY
VDD_EXT
500 ms
V
IL
0.5 V
About 100 ms
V
H
= 0.8 V
BOOT_CONFIG &
USB_BOOT Pins
100 ms. After this time, the BOOT_CONFIG
pins can be set to high level by external circuit.
RESET_N
STATUS
( DO)
10 s
12 s
UART
I nactive
Active
13 s
USB
I nactive Active
Figure 12: Timing of Turning on Module