Audio Interface; Overview - Huawei MC509 Hardware Manual

HUAWEI MC509 CDMA Mini PCIe Module
Hardware Guide
To meet the requirements of 3GPP TS 11.11 protocols and electromagnetic

compatibility (EMC) authentication, the RUIM socket should be placed near the
Mini PCIe interface (it is recommended that the PCB circuit connects the Mini PCIe
interface and the RUIM 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 RUIM_CLK and

RUIM_DATA signal wires with ground. The Ground pin of the RUIM socket and the
Ground pin of the RUIM card must be well connected to the power Ground pin
supplying power to the Mini PCIe Adapter.
A 100 nF capacitor and 1 μF capacitor are placed between the RUIM_PWR and

GND pins in a parallel manner (If RUIM_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 RUIM_DATA and Ground pins, the
RUIM_RESET and Ground pins, and the RUIM_CLK and Ground pins in parallel to
filter interference from RF signals.
It is recommended to take electrostatic discharge (ESD) protection measures near

the RUIM 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 RUIM socket, and the
Ground pin of the ESD protection component is well connected to the power
Ground pin that supplies power to the Mini PCIe Adapter.
It is not recommended that pull the RUIM_DATA pin up during design as a 15000 Ω

resistor is used to connect the RUIM_DATA pin to the RUIM_PWR.

3.7 Audio Interface

3.7.1 Overview

The MC509 Mini PCIe module provides one PCM digital audio interface. Table 3-6
lists the signals on the digital audio interface.
Table 3-6 Signals on the digital audio interface
Pin Pin Name
No.
45 PCM_CLK
47 PCM_DOUT
49 PCM_DIN
51 PCM_SYNC
Issue 03 (2014-12-26)
Pad Description
Type
O PCM interface clock
O PCM I/F data out
I PCM I/F data in
O PCM interface sync
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Copyright © Huawei Technologies Co., Ltd.
Description of the Application Interfaces
Parameter Min.(V)
V 0
OL
V -
OH
V 0
OL
V -
OH
V –0.3
IL
V 1.69
IH
V –0.3
OL
Typ.(V) Max.(V)
- 0.45
2.6 -
- 0.45
2.6 -
- 0.91
- 2.9
- 0.91
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