Quectel Wireless Solutions Company Limited 201404UC15M User Manual
UMTS/HSDPA Module Series
UC15 Mini PCIe Hardware Design
UC15_Mini_PCIe_Hardware_Design Confidential / Released 24 / 40
There are three preconditions when enabling UC15 Mini PCIe to enter the sleep mode:
1. Execute AT command AT+QSCLK=1 to enable the sleep mode. Refer to document [2].
2. UART_DTR pin should be kept in high level (pull-up internally).
3. USB interface on Mini PCIe must be connected with your USB interface, and guarantee USB devices
are in the suspended state.
3.7. Audio Interface
3.7.1. Digital Audio Interface
UC15 Mini PCIe Telematics version provides one Pulse Code Modulation (PCM) digital audio interface,
which supports the following modes.
Short sync mode (works as both master and slave)
Long sync mode (works as master only)
When module works in the short sync mode, PCM_CLK=2048kHz and PCM_SYNC=8kHz. The data is
sampled on the falling edge of the PCM_CLK and transmitted on the rising edge, and the PCM_SYNC
falling edge represents the MSB.
When module works in the long sync mode, PCM_CLK=128kHz and PCM_SYNC=8kHz. The data is
sampled on the falling edge of the PCM_CLK and transmitted on the rising edge, and the PCM_SYNC
rising edge represents the MSB.
The following figures show timing relationship of these two modes.
Figure 9: Short Sync Mode Timing
NOTES