Quectel RM520N-GL - Cellular;Wlan COEX Interface; Antenna Tuner Control Interface

5G Module Series
RM520N-GL_Hardware_Design 54 / 84
4.5. Cellular/WLAN COEX Interface*
The module provides the cellular/WLAN COEX interface, the following table shows the pin definition of
this interface.
Table 25: Pin Definition of COEX Interface
4.6. Antenna Tuner Control Interface
RFFE interface are used for antenna tuner control and should be routed to an appropriate antenna control
circuit. More details about the interface will be added in the future version of this document.
Table 26: Pin Definition of Antenna Tuner Control Interface
If RFFE function is required, please contact Quectel for more details.
13
Please note that COEX_RXD and COEX_TXD cannot be used as general UART ports.
Pin No.
Pin Name
I/O
Description
DC Characteristics
60
N79_TX_EN
DO
Notification from SDR to WLAN when
n79 transmitting
1.8 V
38
WLAN_TX_EN
DI
Notification from WLAN to SDR when
WLAN transmitting
1.8 V
62
COEX_RXD
13
DI, PD
5G/LTE and WLAN coexistence
receive
1.8 V
64
COEX_TXD
13
DO, PD
5G/LTE and WLAN coexistence
transmit
1.8 V
Pin No.
Pin Name
I/O
Description
DC Characteristics
56
RFFE_CLK*
DO, PD
Used for external
MIPI IC control
1.8 V
58
RFFE_DATA*
DIO, PD
1.8 V
24
VDDIO_1V8
PO
Power supply for
Antenna tuner
1.8 V
Max. output current: 50 mA
NOTE