Circuit Recommended For The Usim Card Interface - Huawei MU709 Series Hardware Manual

HUAWEI MU709 Series HSPA+ LGA Module
Hardware Guide
Pin Pad
Pin Name
No. Type
90 USIM_CLK O
70 I
USIM_DE
T
USIM_VC
34 PO
C

3.7.2 Circuit Recommended for the USIM Card Interface

As the MU709 module is not equipped with a USIM socket, you need to place a USIM
socket on the user interface board. Figure 3-14 shows the circuit of the USIM card
interface.
Figure 3-14 Circuit of the USIM card interface
Module
(DCE)
Issue 09 (2017-12-15)
Description Parameter
V
IL
V
OH
USIM card
clock
V
OL
V
IH
USIM
Detection
V
IL
Power
supply for -
USIM card
1 kΩ
USIM - DET
0 Ω
USIM - VCC
0 Ω
USIM - CLK
0 Ω
USIM - DATA
0 Ω
USIM - RESET
470 pF
33 pF 33 pF 33 pF
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Copyright © Huawei Technologies Co., Ltd.
Description of the Application Interfaces
Typ.
Min.(V)
(V)
0 -
0.7 x
-
USIM_VCC
0 -
1.26 1.8
–0.3
-
–0.3
1.8
–0.3
3.0
ESD protection
1 µF
33 pF
100 nF
Max.(V) Comments
0.25 x
USIM_
VCC
3.3
USIM_VC
C=1.8 V or
0.2 x
3.0 V
USIM_
VCC
2.1 The signal
is internally
pulled up.
Keep
USIM_DE
0.63
T floating,
if it is not
used.
USIM_VC
1.98
C=1.8 V
USIM_VC
3.3
C=3.0 V
USIM
36