User's Manual

Cinterion
®
ELS31-VA/ELS51-VA Hardware Interface Description
2.1 Application Interface
56
 ELS31-VA_ELS51-VA_HID_v01.000 2017-01-04
Confidential / Preliminary
Page 17 of 106
Fast
shutdown
FST_SHDN I V
IL
max = 0.63V
V
IH
min = 1.17V
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
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 = 0.45V
V
OH
min = 1.35V
V
OH
max = 1.85V
V
IL
max = 0.63V
V
IL
min = -0.3V
V
IH
min = 1.17V
V
IH
max = 1.85V
If unused keep lines
open.
By delivery default, lines
are available as ASC0
interface lines.
If configured for use as
GPIOs the assignment is
as follows:
DTR0 --> GPIO1
DCD0 --> GPIO2
DSR0 --> GPIO3
RING0 --> GPIO24
CTS0 O
RING0 O
TXD0 I
RTS0 I
DTR0 I
DCD0 O
DSR0 O
Serial
Interface
ASC1
RXD1 O V
OL
max = 0.45V
V
OH
min = 1.35V
V
OH
max = 1.85V
V
IL
max = 0.63V
V
IL
min = -0.3V
V
IH
min = 1.17V
V
IH
max = 1.85V
If unused keep lines
open.
By delivery default, ASC1
interface lines are avail-
able as GPIO lines.
If configured as ASC1
lines, the GPIO lines are
assigned as follows:
GPIO16 --> RXD1
GPIO17 --> TXD1
GPIO18 --> RTS1
GPIO19 --> CTS1
ASC1 is available as data
interface.
CTS1 O
TXD1 I
RTS1 I
Table 2: Signal properties (Continued)
Function Signal name IO Signal form and level Comment