Service Guide

LTE Standard Module Series
EC200U_Series_Hardware_Design 18 / 94
unused, keep it open.
(U)SIM Interface
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
USIM_GND
10
(U)SIM1 card GND
Connect to the GND
of (U)SIM card
connector.
USIM_VDD
14
PO
(U)SIM1 card power
supply
I
O
max = 50 mA
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
Either 1.8 V or 3.0 V
can be recognized by
the module
automatically.
USIM_DATA
15
DIO
(U)SIM1 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
USIM_CLK
16
DO
(U)SIM1 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
USIM_RST
17
DO
(U)SIM1 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
USIM_DET
13
DI
(U)SIM card
V
IL
min = -0.3 V
1.8 V power domain.