Service Guide

LTE Standard Module Series
EG91_Series_Hardware_Design
28
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USIM2_VDD 87 PO
(U)SIM2 card power
supply
For 1.8 V (U)SIM:
Vmax = 1.9 V
Vmin = 1.7 V
For 3.0 V (U)SIM:
Vmax = 3.05 V
Vmin = 2.7 V
I
O
max = 50 mA
Either 1.8 V or 3.0 V is
supported by the module
automatically.
If unused, keep it open.
USIM2_DATA 86 DIO (U)SIM2 card data
For 1.8 V (U)SIM:
V
IL
max = 0.6 V
V
IH
min = 1.2 V
V
OL
max = 0.45 V
V
OH
min = 1.35 V
For 3.0 V (U)SIM:
V
IL
max = 1.0 V
V
IH
min = 1.95 V
V
OL
max = 0.45 V
V
OH
min = 2.55 V
USIM2_CLK 84 DO (U)SIM2 card clock
For 1.8 V (U)SIM:
V
OL
max = 0.45 V
V
OH
min = 1.35 V
For 3.0 V (U)SIM:
V
OL
max = 0.45 V
V
OH
min = 2.55 V
USIM2_RST 85 DO (U)SIM2 card reset
For 1.8 V (U)SIM:
V
OL
max = 0.45 V
V
OH
min = 1.35 V
For 3.0 V (U)SIM:
V
OL
max = 0.45 V
V
OH
min = 2.55 V
USIM2_
PRESENCE
83 DI
(U)SIM2 card
insertion detection
V
IL
min = -0.3 V
V
IL
max = 0.6 V
V
IH
min = 1.2 V
V
IH
max = 2.0 V
1.8 V power domain.
If unused, keep it open.
Main UART Interface
Pin Name
Pin
No.
I/O Description
DC
Characteristics
Comment
RI 39 DO Ring indication V
OL
max = 0.45 V 1.8 V power domain.