CLM920_AC3 Module Hardware Usage Guide
Shanghai Yuge Information Technology co., LTD
- 33 -
The brightness of the network indicator can be adjusted by adjusting the current limiting
resistor R. The current can be adjusted up to 40mA.
。
3.10 PCM digital voice interface (under developing)
The CLM920 AC3 module provides a set of PCM digital audio interfaces for
communication with external CODE audio devices. The set of PCM supports 8-bit A rate, U
rate and 16-bit linear short frame coding format. Interface signal PCM_SYNC is 8kHZ,
PCM_CLK is 2048kHZ
。
Table 3-19 PCM pin definition
Pin Name
I/O Description
para
meter
Level value (V)
Rema
rks
Min
Typical
Max
24
PCM_IN
DI
PCM data
input
VIH
1.2
1.8
2
VIL
-0.3
0.6
25
PCM_OUT
DO
PCM data
output
VOH
1.35
1.8
2
VOL
0
0.45
26
PCM_SYNC DO
PCM frame
sync signal
VOH
1.35
1.8
2
VOL
0
0.45
27
PCM_CLK
DO
PCM clock
pulse
VOH
1.35
1.8
2
VOL
0
0.45
Table 3-20 PCM specific parameters
Characteristic
Description
Encoding format
Linear
Data bit
16bits
Master-slave mode
Master/slave mode
PCM clock
2048kHz
PCM frame synchronization
Short frame
Data Format
MSB
