Neoway N723-EA - Multi-Function Interfaces; Other Interfaces; Ring; Figure 5-40 Pulse Wave for an Incoming Call

N723-EA Hardware User Guide
Chapter 5 Application Interfaces
Copyright © Neoway Technology Co., Ltd. All rights reserved.
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5.7 Multi-Function Interfaces
Table 5-2 Pin definition description
Pin
Function (default)
Multiplexed function 1
Remarks
9
I2S_SCLK
PCM_CLK
-
10
I2S_TX
PCM_DOUT
-
11
I2S_RX
PCM_DIN
-
12
I2S_WS
PCM_SYNC
-
If you need to multiplex the pin function, ensure that the firmware supports multiplexing; for details, consult
Neoway FAEs.
5.8 Other Interfaces
Signal
Pin
I/O
Function description
Remarks
RING
13
DO
Incoming call indicator control
-
NET_LIGHT
83
DO
Network indicator control
-
5.8.1 RING
⚫
RING indicator for an incoming call
Once a voice call is incoming, the UART port outputs "RING" character strings and meanwhile
the RING pin outputs a negative pulse with a width of 30 ms and a period of 5 seconds. After the
call is answered, the pin restores to high-level output.
Figure 5-40 Pulse wave for an incoming call
5 s
30 ms
30 ms