Usb_Boot Interface - Quectel EG25-G Hardware Design

URC
The RI behavior can be changed by AT+QCFG="urc/ri/ring" command. Please refer to document [2] for
details.

3.20. USB_BOOT Interface

EG25-G provides a USB_BOOT pin. Customers can pull up USB_BOOT to VDD_EXT before powering
on the module, thus the module will enter into emergency download mode when powered on. In this mode,
the module supports firmware upgrade over USB interface.
Table 24: Pin Definition of USB_BOOT Interface
Pin Name Pin No.
USB_BOOT 115
The following figure shows a reference circuit of USB_BOOT interface.
EG25-G_Hardware_Design
RI outputs 120ms low pulse when a new URC returns
I/O Description
Force the module to enter into
DI
emergency download mode
Module
USB_BOOT
Figure 31: Reference Circuit of USB_BOOT Interface
Test point
4.7K
Close to test point
TVS
LTE Module Series
EG25-G Hardware Design
Comment
1.8V power domain.
Active high.
It is recommended to reserve test
point.
VDD_EXT
60 / 100