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.
31
Table 3-7
USIM card interface signals
Pin
No.
Pin Name
I/O Description
DC Characteristics (V)
Min
Typical Max
20
SIM_VCC
P
Power source for the
external USIM.
-
1.8/2.9
-
25
SIM_RST
I
External USIM reset
signal.
0
1.8/2.9
2.1/3.3
27
SIM_CLK
O
External USIM clock
signal.
0
1.8/2.9
2.1/3.3
29
SIM_DATA
I/O External USIM data
signal.
0
1.8/2.9
2.1/3.3
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.
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
Figure 3-15
Circuit of the USIM card interface
MODULE
(Modem)
USIM CARD
USIM
SIM-VCC
SIM-CLK
1
2
3
6
5
4
SIM-DATA
SIM-RST
33
pF
33
pF
33
pF
10
0
nF
33
pF
4.7K
Ω
draft2