CLM920_RC3(RV3 RE3)LCC Series CAT1 Module Hardware Manual
Shanghai YUGE Information Technology Co., Ltd.
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GSM and non-data service transmission
Slow flashing (1800ms high / 1800ms
low)
The reference design drawing of the module network indicator is as follows
：
Figure 3-20 Network indicator circuit diagram
The brightness of the network indicator can be adjusted by adjusting the current limiting
resistor.
3.10 PCM Digital voice interface
The CLM920_RC3 module provides a set of PCM digital audio interfaces to communicate
with external CODE audio devices. This group of PCM supports 8-bit A-rate, U-rate and
16-bit linear short frame encoding formats. Interface signal PCM_SYNC is 8kHZ,
PCM_CLK is 2048kHZ.
Table 3-21 PCM pin definition
Pin
Signal name
I/O
Description
24
PCM_IN
DI
PCM data input
25
PCM_OUT
DO
PCM data output
26
PCM_SYNC
DO
PCM frame synchronization signal
27
PCM_CLK
DO
PCM clock pulse
Table 3-22 PCM specific parameters
