
Cinterion
®
LTE Terminals Hardware Interface Description
3.8 Power Supply
47
ELSxT_HID_v04
2018-09-04
Confidential / Preliminary
Page 41 of 102
3.8
Power Supply
The LTE Terminals power supply via Western jack has to be a single voltage source of
V
PLUS
=8V…57V capable of providing a peak current (pulsed 2x577ms at T=4.615ms) of about
1.2A at 8V during an active transmission
1
in GSM mode. The uplink burst causes strong ripple
(drop) on the power lines. The drop voltage should not exceed 1V. The absolute minimum volt-
age during drops is given in
The LTE Terminals are protected from supply voltage reversal. An external fast acting fuse
>0.4A with melting integral I
2
t (0.15 … 0.25)A
2
s is necessary to use the LTE Terminals at a 12V
or 24V unlimited power supply system.
The power supply must be compliant with the EN60950 guidelines. A switching regulator reg-
ulates the input voltage for the internal supply.
When power fails for >1ms, LTE Terminals reset or switch off. The watchdog can be configured
to restart the LTE Terminals. When power fails for >15s the RTC will be reset.
Figure 18:
6-pole Western jack for power supply, ignition, reset, typical connection
Mains adapter: If it fits into the design of your application we recommend the plug-in supply unit
used with the type approved Gemalto M2M reference setup. Ordering information can be found
in
. This 12V mains adapter comes with a 6-pole Western plug and provides an inter-
1. As an alternative to the power supply via Western jack, Power over Ethernet (PoE) can be employed.
The PoE feature complies with IEEE 802.3 standards, and can be made available in Ethernet networks
via PoE enabled devices such as PoE routers or injectors.
Table 17:
Female 6-pole Western plug for power supply, ignition, power down
Pin
Signal name
Use
Parameters
1
PLUS
Power supply
8V – 57V DC
2
PLUS
Power supply
8V – 57V DC
3
RST_IN
Signal for module reset
U
IH
> 8V for t>10ms resets the terminal.
U
IL
<2V and low level for normal operation.
4
IGT_IN
--
not supported on LTE Terminals
5
GND
Ground
0V
6
GND
Ground
0V
Pin assignmment and typical connection :
1 PLUS
2 PLUS
3 RST_IN
4 IGT_IN
5 GND
6 GND
V
PLUS
DC
6 5 4 3 2 1