User's Manual

FC20-N Series Hardware Design
FC20-N_Series_Hardware_Design Confidential / Released 23 /
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3.6. Coexistence Interface
Coexistence function is only supported by FC20. Please keep these pins open in FC20-N.
The following table shows the pin definition of FC20’s coexistence interface.
Table 9: Pin Definition of Coexistence Interface
Pin Name
Pin No.
I/O
Description
Comment
LTE_UART_TXD
5
DO
LTE coexistence signal
If unused, keep this pin
open.
LTE_UART_RXD
6
DI
LTE coexistence signal
If unused, keep this pin
open.
FC20 module supports LTE-WLAN coexistence and LTE-BT coexistence. The following figure shows
the coexistence interface connection between FC20 and EC20 R2.0/EC21/EC25.
LTE_UART_RXD
LTE_UART_TXD
FC20
COEX_UART_RX
COEX_UART_TX
EC2 R2.0/
EC21/EC25
Figure 7: Coexistence Interface Connection
LTE-BT coexistence function is under development.
3.7. Other Interfaces
3.7.1. DBG_TXD Interface
DBG_TXD interface can be used for log output.
NOTE