User Manual

Smart Machine Smart Decision
SIM7100_Hardware_Design_V1.02 2015-06-16
3.5 USIM Interface
SIM7100 supports both 1.8V and 3.0V USIM Cards.
Table 11: USIM Electronic characteristic in 1.8V mode (USIM_VDD =1.8V)
Symbol Parameter
Min. Typ. Max. Unit
USIM_VDD LDO power output voltage
1.75 1.8 1.95
V
V
IH
High-level input voltage 0.65·USIM_VDD - USIM_VDD +0.3 V
V
IL
Low-level input voltage -0.3 0 0.35·USIM_VDD V
V
OH
High-level output voltage
USIM_VDD
-0.45
- USIM_VDD V
V
OL
Low-level output voltage 0 0 0.45 V
Table 12: USIM Electronic characteristic 3.0V mode (USIM_VDD =2.95V)
Symbol Parameter
Min. Typ. Max. Unit
USIM_VDD LDO power output voltage
2.75 2.95 3.05 V
V
IH
High-level input voltage 0.65*USIM_VDD - USIM_VDD +0.3 V
V
IL
Low-level input voltage -0.3 0 0.25·USIM_VDD V
V
OH
High-level output voltage
USIM_VDD
-0.45
- USIM_VDD V
V
OL
Low-level output voltage 0 0 0.45 V
3.5.1 USIM 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 USIM
peripheral circuit should be close to the USIM card socket. The following figure shows the 6-pin
SIM card holder reference circuit.