Product Info

LTE-A Module Series
EG12 Hardware Design
EG12_Hardware_Design 64 / 100
3.20. RFFE Interface*
RFFE signals are used for external tuner control and should be routed to an appropriate antenna control
circuitry.
Table 27: Pin Definition of RFFE Interface
“*” means under development.
3.21. USB_BOOT Interface
EG12 provides a USB_BOOT pin. Developers 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 28: Pin Definition of USB_BOOT Interface
The following figure shows a reference circuit of USB_BOOT interface.
Pin Name
Pin No.
I/O
Description
Comment
RFFE_CLK
71
DO
RFFE serial interface
used for external tuner control.
If unused, keep it open.
RFFE_DATA
73
IO
If unused, keep it open.
VDD_RF
162
PO
Provide 2.85V for external RF
circuit.
If unused, keep it open.
Pin Name
Pin No.
I/O
Description
Comment
USB_BOOT
140
DI
Force the module to enter into
emergency download mode
1.8V power domain.
Active high.
If unused, keep it open.
NOTE