Product Info

LTE Standard Module Series
EG95 Series Hardware Design
EG95_Series_Hardware_Design
56 / 99
Pin Name
Pin No.
I/O
Description
USB_BOOT
75
DI
Force the module to enter
emergency download mode
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.
The default behaviors of the RI are shown as below, and can be changed by AT+QCFG="urc/ri/ring"
command. Please refer to document [2] for details.
Table 21: Default Behaviors of RI
State Response
Idle RI keeps at high level
URC RI outputs 120ms low pulse when a new URC returns
3.18. USB_BOOT Interface
EG95 provides a USB_BOOT pin. Customers can pull up USB_BOOT to 1.8 V 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 22: Pin Definition of USB_BOOT Interface
Comment
1.8 V power domain.
Active high.
It is recommended to
reserve test points.
The following figures show the reference circuit of USB_BOOT interface and timing sequence of entering
emergency download mode.