CEM600 EVDO Mini PCIE Module Hardware User Guide
Shang Hai YUGE Information Technology co., LTD
Page 14 of 25
Figure 5-4 USB interface reference design
Note:
1. As shown in the USB interface reference design drawing, it should be noted that the
ESD protection device should be added to the data line. The USB trace design of the DTE
interface board needs to strictly follow the USB2.0 protocol requirements, and the differential
trace has a control impedance of 90Ω.
2. The USB bus supply voltage is provided internally by the module and does not need to
be provided externally. At the same time, since the USB interface of the module does not
provide USB bus power, the module can only be used as a slave device of the USB bus.
5.3 PCM interface (optional feature)
Table 5-3 PCM Interface Definition
Pin
Signal name I/O properties
High value
Description
45
PCM_CLK
Two way
2.6V
PCM clock
47
PCM_DOUT Two way
2.6V
PCM data output
49
PCM_DIN
Two way
2.6V
PCM data input
51
PCM_SYNC Two way
2.6V
PCM synchronization
GND
Ground
This interface is a PCM/I2S interface and can support the following functions:
Bluetooth
Codec interface
DAC/ADC interface
The following figure shows an application of the PCM interface for digital voice
transmission. It is converted to analog voice by an external Codec chip, and then connected to
the MIC and RECEIVER.
