Usb_Boot Interface - Quectel EC25-AUX Hardware Design

NOTE
URC can be outputted from UART port, USB AT port and USB modem port through configuration via
AT+QURCCFG command. The default port is USB AT port.
In addition, RI behavior can be configured flexibly. The default behaviors of the RI is shown as below.
Table 23: Behaviors of RI
State
Idle
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

EC25 provides a USB_BOOT pin. Customers can pull up USB_BOOT to 1.8V before VDD_EXT is
powered up, and the module will enter emergency download mode when it is 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.
EC25_Hardware_Design
Response
RI keeps at high level
RI outputs 120ms low pulse when a new URC returns
I/O Description
Force the module to enter emergency
DI
download mode
LTE Standard Module Series
EC25 Hardware Design
Comment
1.8V power domain.
Active high.
It is recommended to
reserve a test point.
67 / 130