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 16 of 106
2.1.2 Signal Properties
Table 2: Signal properties
Function Signal name IO Signal form and level Comment
Power
supply
BATT_BB
BATT_RF
IV
I
max = 4.5V
V
I
norm = 3.8V
V
I
min = 3.3V
Imax=720mA nominal voltage 3.8V
- 300 mA for BATT_RF
- 420 mA for BATT_BB
Lines of BATT+ and GND
must be connected in
parallel for supply pur-
poses because higher
peak currents may occur.
Minimum voltage must
not fall below 3.3V includ-
ing drop, ripple, spikes
and not rise above 4.5V.
Power
supply
GND Ground Application Ground
External
supply
voltage
V180 O V
O
norm = 1.80V
V
O
min = 1.71 V
V
O
max = 1.89V
I
O
max = 50mA
CLmax = 2µF
V180 may be used to
supply level shifters at
the interfaces or to supply
external application cir-
cuits.
If unused keep line open.
VCORE O V
O
norm = 1.1V
V
O
min= 1.09
V
O
max= 1.12
I
O
max = 50mA
CLmax = 100nF
Ignition ON I BATT_BB= 4.5V
V
IH
max = 5.5V
V
IH
min = 2.16V
V
IL
max = 1.79V
V
IL
min=0V
BATT_BB= 3.3V
V
IH
max = 5.5V
V
IH
min = 1.7V
V
IL
max = 1.3V
V
IL
min = 0V
Min low time before rising edge
<=100µs
Rin = 380k
ON ___|
--
|____ high level min. 100µs
Edge triggered signal to
switch the module on.
Set this signal low before
and after the startup
impulse. Input is Schmitt
Trigger.
The ON signal can be
connected to BATT_BB.
In this case, the module
cannot be switched off by
a fast shutdown, but can
only be switched off by
disconnecting BATT_BB.
Emergency
restart
EMERG_RST I V
IH
max = 5.5V
V
IH
min = 0.85V
V
IL
max =0.65V
V
IL
min= 0V
Internal pull-up resistor
Low impulse width > 10ms
Pulse triggered signal to
reset the module. This
line must be driven low by
an open drain or open
collector driver con-
nected to GND. See also
Section 3.2.2.2.
If unused keep line open.