Usim Interface; Usim Application Guide - SIM Tech SimCom SIM7100 Hardware Design

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.
Table 11: USIM Electronic characteristic in 1.8V mode ( USIM_VDD =1.8V)
Symbol Parameter
USIM_VDD LDO power output
V High-level input voltage
IH
V Low-level input voltage
IL
V High-level output voltage
OH
V Low-level output voltage
OL
Table 12: USIM Electronic characteristic 3.0V mode ( USIM_VDD =2.95V)
Symbol Parameter
USIM_VDD LDO power output
V High-level input voltage
IH
V Low-level input voltage
IL
V High-level output voltage
OH
V Low-level output voltage
OL
3.5.1

USIM Application Guide

It is recommended to use an ESD protection component such as ST
SEMI (www.onsemi.com
socket. The reference circuit of the 6-pin SIM card holder is illustrated in the following figure.
SIM7100_Hardware Design_V1.01
Min.
1.75
0.65·USIM_VDD
-0.3
USIM_VDD -0.45
0
Min.
2.75
0.65*USIM_VDD
-0.3
USIM_VDD -0.45
0
) SMF05C. Note that the SIM peripheral circuit should be close to the SIM card
Smart Machine Smart Decision
Typ.
1.8
-
0
-
0
Typ.
2.95
-
0
-
0
(www.st.com
34
Max. Unit
1.95
V
USIM_VDD +0.3 V
0.35·USIM_VDD V
USIM_VDD V
0.45 V
Max. Unit
3.05 V
USIM_VDD +0.3 V
0.25·USIM_VDD V
USIM_VDD V
0.45 V
) ESDA6V1W5 or ON
2015-01-20