Huawei ME909 Audio Interface, Pin Pin Name Description DC Characteristics Min Typ, PCM clock

HUAWEI ME909 Series Mini PCIe Module
Hardware Guide	Description of the Application Interfaces

To meet the requirements of 3GPP TS 51.010-1 protocols and electromagnetic compatibility (EMC) authentication, the USIM socket should be placed near the PCIe interface (it is recommended that the PCB circuit connects the PCIe interface and the USIM socket does not exceed 100 mm), because a long circuit may lead to wave distortion, thus affecting signal quality.

It is recommended that you wrap the area adjacent to the UIM_CLK and

UIM_DATA signal wires with ground. The Ground pin of the USIM socket and the Ground pin of the USIM card must be well connected to the power Ground pin supplying power to the PCIe Adapter.

A 100 nF capacitor and1 μF capacitor are placed between the UIM_PWR and GND pins in a parallel manner (If UIM_PWR circuit is too long, that the larger capacitance such as 4.7 μF can be employed if necessary). Three 33 pF capacitors are placed between the UIM_DATA and Ground pins, the UIM_RESET and Ground pins, and the UIM_CLK and Ground pins in parallel to filter interference from RF signals.

It is recommended to take electrostatic discharge (ESD) protection measures near the USIM card socket. The TVS diode with Vrwm of 5 V and junction capacitance less than 10 pF must be placed as close as possible to the USIM socket, and the Ground pin of the ESD protection component is well connected to the power Ground pin that supplies power to the PCIe Adapter.

3.11Audio Interface

The ME909 module provides one PCM digital audio interface. Table‎ 3-5lists the signals on the digital audio interface.

The software feature of PCM is planning.

Table 3-5Signals on the digital audio interface

Pin	Pin Name	I/O	Description	DC Characteristics (V)
No.				Min.	Typ.	Max.

45	PCM_CLK	O	PCM clock	–0.3	1.8	2.1
49	PCM_DIN	I	PCM data input	–0.3	1.8	2.1
51	PCM_SYNC	O	PCM interface sync	–0.3	1.8	2.1
47	PCM_DOUT	O	PCM data output	–0.3	1.8	2.1

The ME909 module interface enables communication with an external codec to support linear format.

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Issue 0.1 (2013-06-09)	Copyright © Huawei Technologies Co., Ltd.