Antenna Tuner Control Interfaces; Usb_Boot Interface - Quectel EG12 Series Hardware Design

3.20. Antenna Tuner Control Interfaces*

The module supports external antenna tuner control through either RFFE interface or dedicated GPIO
interfaces. Customers can choose either one according to their tuner design. The following are the pin
definitions of the RFFE and dedicated GPIO interfaces.
Table 27: Pin Definition of RFFE Interface for Antenna Tuner Control
Pin Name Pin No.
RFFE_CLK 71
RFFE_DATA 73
VDD_RF 162
Table 28: Pin Definition of Dedicated GPIO Interfaces for Antenna Tuner Control
Pin Name Pin No.
GPIO_3 159
GPIO_4 161
GPIO_5 172
VDD_RF 162
NOTE
"*" means under development.

3.21. USB_BOOT Interface

EG12 provides a USB_BOOT pin. Pulling up USB_BOOT to VDD_EXT before power-on will make the
module enter emergency download mode when powered on. In this mode, the module supports firmware
upgrade over USB interface.
EG12_Hardware_Design
I/O Description
DO
RFFE serial interface
for external tuner control.
IO
Provide 2.85V for external RF
PO
circuit.
I/O Description
IO
GPIO interfaces
IO
dedicated for external tuner control.
IO
Provide 2.85V for external RF
PO
circuit.
LTE-A Module Series
EG12 Hardware Design
Comment
If unused, keep it open.
If unused, keep it open.
If unused, keep it open.
Comment
If unused, keep it open.
If unused, keep it open.
If unused, keep it open.
If unused, keep it open.
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