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 18 of 102
Fast
shutdown
FST_SHDN I V
IL
max = 0.35V
V
IH
min = 1.30V
V
IH
max = 1.85V
~~|___|~~ low impulse width > 10ms
This line must be driven
low.
If unused keep line open.
Note that the fast shut-
down line is originally
available as GPIO line. If
configured as fast shut-
down, the GPIO line is
assigned as follows:
GPIO4 --> FST_SHDN
RTC
backup
VDDLP I/O V
O
norm = 1.8V
I
O
max = -25mA
V
I
max = 1.9V
V
I
min = 1.0V
I
I
typ < 1µA
It is recommended to use
a serial resistor between
VDDLP and a possible
capacitor.
If unused keep line open.
USB VUSB_IN I V
I
min = 3V
V
I
max = 5.25V
Active and suspend current:
I
max
< 100µA
All electrical characteris-
tics according to USB
Implementers' Forum,
USB 2.0 Specification.
If unused keep lines
open.
USB_DN I/O Full and high speed signal characteris-
tics according USB 2.0 Specification.
USB_DP
Serial
Interface
ASC0
RXD0 O V
OL
max = 0.25V at I = 1mA
V
OH
min = 1.55V at I = -1mA
V
OH
max = 1.85V
If unused keep lines
open.
Note that some ASC0
lines are originally avail-
able as GPIO lines. If
configured as ASC0
lines, the GPIO lines are
assigned as follows:
GPIO1 --> DTR0
GPIO2 --> DCD0
GPIO3 --> DSR0
GPIO24 --> RING0
The DSR0 line is also
shared with the SPI inter-
face‘s SPI_CLK signal.
CTS0 O
DSR0 O
DCD0 O
RING0 O
TXD0 I V
IL
max = 0.35V
V
IH
min = 1.30V
V
IH
max = 1.85V
RTS0 I Pull down resistor active
V
IL
max = 0.35V at > 50µA
V
IH
min = 1.30V at < 240µA
V
IH
max = 1.85V at < 240µA
DTR0 I Pull up resistor active
V
IL
max = 0.35V at < -200µA
V
IH
min = 1.30V at > -50µA
V
IH
max = 1.85V
Table 2: Signal properties
Function Signal name IO Signal form and level Comment