User's Manual

UMTS/HSDPA Module Series
UC15 Hardware Design
UC15_Hardware_Design Confidential / Released 48 / 78
The following figure shows the reference design of PCM interface with external codec IC.
Figure 29: Reference Circuit of PCM Application with Audio Codec
1. It is recommended to reserve RC (R=22Ω, C=22pF) circuit on the PCM lines, especially for
PCM_CLK.
2. I2C bus is the standard interface, which is used with NAU8814 application by default.
3. The PCM feature is under development.
3.13. USIM Card Interface
3.13.1. USIM Card Application
The USIM card interface circuitry meets ETSI and IMT-2000 USIM interface requirements. Both 1.8V and
3.0V USIM cards are supported.
Table 17: Pin Definition of the USIM Interfaces
Pin Name Pin No. I/O Description Comment
USIM_VDD 12 PO Power supply for USIM card.
Either 1.8V or 3.0V is supported
by the module automatically.
USIM_DATA 13 IO Data signal of USIM card.
NOTES