Usb_Boot Interface - Quectel LTE-A Series Hardware Design

GPIO_5 172
VDD_RF 162
NOTE
"*" means under development.

3.20. USB_BOOT Interface

EG18 provides a USB_BOOT pin. Developers can pull up USB_BOOT to VDD_EXT before powering on
the module, to make the module enter into emergency download mode when powered on. In this mode,
the module supports firmware upgrade over USB interface.
Table 29: Pin Definition of USB_BOOT Interface
Pin Name Pin No.
USB_BOOT 140
The following figure shows a reference circuit of USB_BOOT interface.
EG18_Hardware_Design
IO
PO Provide 2.85V for external RF circuit.
I/O Description
Force the module to enter into
DI
emergency download mode
Module
USB_BOOT
TVS
Figure 35: Reference Circuit of USB_BOOT Interface
VDD_EXT
Test Point
10K
Close to module
LTE-A Module Series
EG18 Hardware Design
If unused, keep it open.
If unused, keep it open.
Comment
1.8V power domain.
Active high.
If unused, keep it open.
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