HUAWEI MU739 HSPA+ LGA Module
Hardware Guide
Description of the Application Interfaces
Issue 01 (2011-08-24)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
33
3.6.3
ESD Protection for the USIM Card Interface
It is recommended that you take electrostatic discharge (ESD) protection measures
near the USIM card socket. Figure 3-17 shows ESD protection circuit of the USIM
card, in which the transient voltage suppressor (TVS) diode is placed as close as
possible to the USIM card socket, and the GND pin of the ESD protection component
is well connected to the power GND pin that supplies power to the MU739 module.
Figure 3-17
ESD protection circuit on the USIM card
3.7 Audio Interface
I2S features:
Two supported modes: Normal mode and PCM mode
32-bit data path
Interface can operate in master and slave mode
Two independent 64 word data buffers for receiver and transmitter
Bi-directional transmission with independent receiver and transmitter
Two independent fractional dividers for bit clock generation for reception and
transmission in master mode
Adjustable audio sampling rate (48 KHz, 44.1 KHz, 32 KHz, 24 KHz, 22.05 KHz,
16 KHz, 12 KHz, 11.025 KHz and 8 KHz).
Table 3-8
I2S interface signals
Pin
No.
Pin Name
I/
O
Description
DC Characteristics (V)
Normal
MUX
Min Typical Max
54
I2S_CLK1
-
O Serial clock
-0.3 1.8
2.1
55
I2S_CLK0
PCM_CLK
O Serial clock
-0.3 1.8
2.1
draft2