User's Manual

Smart Machine Smart Decision
SIM7100A_User Manual_V1.01 2014-12-11
36
3.5 USIM Interface
The USIM provides the required subscription verification information to allow the mobile equipment to
attach to a GSM or UMTS network. Both 1.8V and 3.0V SIM Cards are supported.
3.5.1 USIM Pin description
Table 15: USIM Pin description
Table 16: USIM Electronic characteristic
Symbol Parameter
3.0V mode 1.8V mode
Unit
Min Typ Max Min Typ Max
USIM_VDD
LDO power
output
2.71 2.85 3.05
1.7 1.8 1.9
V
V
IH
High-level
input
voltage
0.65·USI
M_VDD
-
USIM_V
DD +0.3
0.65·USI
M_VDD
-
USIM_VDD
+0.3
V
V
IL
Low-level
input
voltage
-0.3 0
0.3·USI
M_VDD
-0.3 0
0.3·USIM_V
DD
V
V
OH
High-level
output
voltage
2.71 2.85 3.05
1.7 1.8 1.9
V
V
OL
Low-level
output
voltage
0 0 0.45 0 0 0.45 V
Pin name Pin Description
USIM_CLK 19 USIM Card Clock
USIM_RST 18 USIM Card Reset
USIM_DATA 17
USIM Card data I/O, which has been pulled up with a 22kR resistor to
USIM_VDD in module. Do not pull up or pull down in users’ application
circuit.
USIM_VDD 20
USIM Card Power output depends automatically on USIM mode，one is
3.0V±10%, another is 1.8V±10%. Current is less than 50mA.