User Manual
UMTS/HSDPA Module Series
UC15 Mini PCIe Hardware Design
UC15_Mini_PCIe_Hardware_Design Confidential / Released 25 / 40
Figure 10: Long Sync Mode Timing
I2C interface can be used to work with PCM interface for the audio codec design. The following table
shows the pin definition of PCM and I2C interfaces.
Table 10: Pin Definition of PCM and I2C Interface
Module firmware has integrated the configuration on NAU8814 application with I2C interface, and works
in short sync mode by default. You can enable this configuration with command AT+QDAI=2, and
AT+QAUDPATH=2 will configure the audio channel to PCM interface, AT+QAUDPATH=0 configures the
audio channel to analog audio interface. Refer to document [2] for details.
Pin No.
Pin Name I/O Description Power Domain
30 I2C_SCL DO I2C clock signal Require external pull-up to 2.6V.
32 I2C_SDA IO I2C data signal Require external pull-up to 2.6V.
45 PCM_CLK IO PCM clock signal 2.6V
47 PCM_DOUT DO PCM data output 2.6V
49 PCM_DIN DI PCM data input 2.6V
51 PCM_SYNC IO PCM frame sync signal 2.6V