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FIBOCOM NL668-AM Hardware User Manual
Page 40 of 62
to enter sleep mode is higher than Pin control to enter sleep mode.
The ATS24 function cannot ensure the module must be in sleep after X seconds, if the timer over
and the module cant into sleep. It will try again.
If you want to use the RI signal to represent the state of the module, please refer to the
AT+GTWAKE command in the AT manual.
3.9 Digital audio interface PCM
NL668-AM provides a PCM interface for communication with digital audio devices such as an external
CODEC. Digital audio interface including PCM_CLK, PCM_SYNC, and PCM_IN / PCM_OUT.
3.9.1 Support model
NUM.
Product model
Description
1
NL668-AM-00
support
2
NL668-AM-01
support
Table 3-19 Support model
3.9.2 PCM interface definition
PIN Name
I/O
PIN Num.
Description
PCM_IN
I
24
PCM Input
PCM_OUT
O
25
PCM Output
PCM_SYNC
I/O
26
PCM Synchronous Signal
PCM_CLK
I/O
27
PCM CLK
Table 3-20 PCM Interface Definition
3.9.3 PCM interface description
Single Name
Freq.
Duty
Cycle
Coded
Format
Operating
Mode
Description
PCM_CLK
2.048MHz
50%
16bit
Liner
mono
Module
serves as the
master that
supports
PCM slave
PCM CLK
PCM_OUT
-
-
PCM Output
PCM_IN
-
-
PCM Input
PCM_SYNC
8KHz
BURST
PCM Synchronous Signal
(Falling edge sampling)
Table 3-21 PCM Interface Description
NL668-AM adopts the above configuration by default, if you need to make adjustment, please contact our
