Specifications

Smart Machine Smart Decision
SIM7080G _Hardware Design _V1.03 31 2019-12-13
3.5 SIM Interface
SIM7080G only supports 1.8V SIM Cards.
Table 11: SIM electronic characteristic in 1.8V mode (SIM_VDD=1.8V)
Symbol
Parameter
Min.
Typ.
Max.
Unit
SIM_V
DD
LDO power output voltage
1.75
1.8
1.95
V
V
IH
High-level input voltage
0.65*SIM_VDD
-
SIM_VDD +0.3
V
V
IL
Low-level input voltage
-0.3
0
0.35*SIM_VDD
V
V
OH
High-level output voltage
SIM_VDD -0.45
-
SIM_VDD
V
V
OL
Low-level output voltage
0
0
0.45
V
3.5.1 SIM Application Guide
It is recommended to use an ESD protection component such as ESDA6V1W5 produced by ST
(www.st.com
) or SMF15C produced by ON SEMI (www.onsemi.com ). Note that the SIM
peripheral circuit should be close to the SIM card socket.The following figure shows the 6-pin SIM
card holder reference circuit.
MODULE
TVS
SIM_ VDD
SIM_ CLK
SIM_ DATA
SIM_ RST
VCC GND
RST VPP
CLK I /O
22
Ω
100nF
C707 10M 006 512
SIM Socket
22
Ω
22
Ω
NC
NC
NC
Figure 16: SIM interface reference circuit
SIM_DATA has been pulled up with a 20KΩ resistor to SIM_VDD in module, so it no need
pulled up resistor anymore.
SIM_VDD needs a 100nF capacitor close to SIM socket.
SIM_CLK is very important signal, the rise time and fall time of SIM_CLK should be less
than 40ns. So the junction capacity of the TVS need to less 50pF.