A7600E-H CAT4 Series-PCIE Hardware Design V1.01
NOTE
The USB data cable must be strictly routed in 90Ω +/- 10% differential. The TVS devices D1 and D2 on the data line must be selected with equivalent capacitance less than 1pF.
3.5 USIM Interface
A7600E-H CAT4 Series-PCIE supports both 1.8V and 3.0V USIM Cards. The interface power of the
USIM card is provided by the voltage regulator inside the module, and the normal voltage value is 3V or 1.8V.
3.5.1 USIM Electronic characteristic
Table 6: USIM Electronic characteristic in 1.8V mode (USIM_VDD =1.8V)
Symbol
USIM_VDD
V
IH
V
IL
V
OH
V
OL
Parameter Min.
LDO power output voltage 1.62
High-level input voltage
Low-level input voltage
0.7*USIM_VDD -
-0.4 0
High-level output voltage USIM_VDD -0.4 -
Low-level output voltage 0 0
Typ. Max.
1.8 1.98
Table 7: USIM Electronic characteristic 3.0V mode (USIM_VDD =3V)
Unit
V
USIM_VDD +0.4 V
0.25*USIM_VDD V
USIM_VDD V
0.25*USIM_VDD V
Symbol Parameter Min. Typ. Max. Unit
USIM_VDD
V
IH
LDO power output voltage 2.7
High-level input voltage 0.7*USIM_VDD
3
-
3.3 V
USIM_VDD +0.4 V
V
IL
V
OH
Low-level input voltage
High-level output voltage
-0.4
USIM_VDD
-0.45
0
0
-
0.25*USIM_VDD V
USIM_VDD V
V
OL
Low-level output voltage 0 0.25*USIM_VDD V
3.5.2 USIM reference design
It is recommended to refer to the following circuit to design the SIM card circuit, 100nF decoupling capacitor, TVS can be reserved. www.simcom.com 21 / 46
