UMTS/HSPA+ Module Series
UC200A-GL_Hardware_Design 40 / 78
4.4. PCM and I2C Interface
The module provides one Pulse Code Modulation (PCM) digital interface for audio design, which supports
the primary mode (short frame synchronization) and the module works as both master and slave.
The module can only be used as primary devices in applications related to I2C interfaces.
In short frame mode, the data is sampled on the falling edge of the PCM_CLK and transmitted on the
rising edge. The PCM_SYNC falling edge represents the MSB. In this mode, the PCM interface supports
256 kHz, 512 kHz, 1024 kHz, 2048 kHz PCM_CLK at 8 kHz PCM_SYNC, and also supports 4069 kHz
PCM_CLK at 16 kHz PCM_SYNC.
The module supports a 16-bit linear encoding format. The following figure shows the sequence diagram of
short frame mode. (PCM_SYNC = 8 kHz, PCM_CLK = 2048 kHz).
PCM_CLK
PCM_SYNC
PCM_DOUT
MSB
LSB
MSB
125 µs
1
2
256
255
PCM_DIN
MSB
LSB
MSB
Figure 21
:
Timing Sequence for Short frame mode
Table 15: Pin Definition of PCM Interface
Pin Name
Pin No.
I/O
Description
Comment
PCM_SYNC
26
DIO
PCM data frame sync
1.8 V power domain.
In master mode, it serves as an
output signal.
In slave mode, it is used as an
input signal.
If unused, keep it open.
PCM_CLK
27
DIO
PCM clock