Circuit Recommended For The Usim Card Interface - Huawei MU739 Hardware Manual

HUAWEI MU739 HSPA+ LGA Module
Hardware Guide
Table 3-7 USIM card interface signals
Pin
No.
20
25
27
29

3.6.2 Circuit Recommended for the USIM Card Interface

As the MU739 module is not equipped with a USIM card socket, you need to place a
USIM card socket on the user interface board. The USIM card signals are transmitted
outwards through the 114-pin LGA interface. Figure 3-15 shows the circuit of the
USIM card interface.
Figure 3-15 Circuit of the USIM card interface
MODULE
(Modem)
Issue 01 (2011-08-24)
Pin Name I/O
SIM_VCC P
SIM_RST I
SIM_CLK O
SIM_DATA I/O
There is no pull-up on SIM_DATA within MU739, an external resistor (4.7Kohm recommended)
must be added between SIM_DATA and SIM_VCC
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
Description of the Application Interfaces
Description
Power source for the
external USIM.
External USIM reset
signal.
External USIM clock
signal.
External USIM data
signal.
USIM CARD
6
5
4
4.7KΩ
SIM - VCC
SIM - CLK
SIM - DATA
SIM - RST
DC Characteristics (V)
Min Typical Max
- 1.8/2.9 -
0 1.8/2.9 2.1/3.3
0 1.8/2.9 2.1/3.3
0 1.8/2.9 2.1/3.3
1
2
3
USIM
31