User's Manual

Cinterion
®
ELS61-AUS Hardware Interface Description
2.1 Application Interface
52
 ELS61-AUS_HID_v00.031 2016-06-03
Confidential / Preliminary
Page 19 of 102
Serial
Interface
ASC1
RXD1 O V
OL
max = 0.25V at I = 1mA
V
OH
min = 1.55V at I = -1mA
V
OH
max = 1.85V
V
IL
max = 0.35V
V
IH
min = 1.30V
V
IH
max = 1.85V
If unused keep line open.
Note that the ASC1 inter-
face lines are originally
available as GPIO lines.
If configured as ASC1
lines, the GPIO lines are
assigned as follows:
GPIO16 --> RXD1
GPIO17 --> TXD1
GPIO18 --> RTS1
GPIO19 --> CTS1
TXD1 I
RTS1 I
CTS1 O
SIM card
detection
CCIN I R
I
≈ 110kΩ
V
IH
min = 1.45V at I = 15µA,
V
IH
max= 1.9V
V
IL
max = 0.3V
CCIN = High, SIM card
inserted.
For details please refer to
Section 2.1.6.
If unused keep line open.
3V SIM
Card Inter-
face
CCRST O V
OL
max = 0.30V at I = 1mA
V
OH
min = 2.45V at I = -1mA
V
OH
max = 2.90V
Maximum cable length or
copper track to SIM card
holder should not exceed
100mm.
CCIO I/O V
IL
max = 0.50V
V
IH
min = 2.05V
V
IH
max = 2.90V
V
OL
max = 0.25V at I = 1mA
V
OH
min = 2.50V at I = -1mA
V
OH
max = 2.90V
CCCLK O V
OL
max = 0.25V at I = 1mA
V
OH
min = 2.40V at I = -1mA
V
OH
max = 2.90V
CCVCC O V
O
min = 2.80V
V
O
typ = 2.85V
V
O
max = 2.90V
I
O
max = -30mA
Table 2: Signal properties
Function Signal name IO Signal form and level Comment