CEM600 EVDO Mini PCIE Module Hardware User Guide
Shang Hai YUGE Information Technology co., LTD
Page 16 of 25
Figure 5-6 Differential Audio Interface Reference Design
The differential audio channel can also work in single-ended mode, such as an external
headphone jack. The single-ended audio interface is preferably packaged on the outside of the
PCB design. The audio input and the audio output need to be separated to prevent crosstalk.
At the same time, keep away from power, RF, antenna and other circuits. In addition, it is
recommended to add ESD protection devices at the interface.
The reference design diagram for the single-ended audio interface is as follows:
Figure 5-7 Single-ended audio interface reference design
5.5 RUIM card interface
Table 5-5 RUIM card interface definition
Pin
Signal name
I/O properties High value Description
8
VREG_RUIM
Output
1.8V/2.85V RUIM card power supply
10
RUIM_DATA
Two way
1.8V/2.85V RUIM card data
12
RUIM_CLK
Output
1.8V/2.85V RUIM card clock
14
RUIM_RESET
Output
1.8V/2.85V RUIM card reset
GND
Ground
The CEM600 module can be connected to a 3.0V/1.8V RUIM card and can be
automatically detected.
