Cinterion
®
Java Terminals Hardware Interface Overview
3.8 Power Supply
39
EHSxT_BGS5T_HIO_v03
2016-05-26
Confidential / Released
Page 33 of 50
3.8
Power Supply
The Java Terminals power supply via Western jack has to be a single voltage source of
V
PLUS
=8V…30V capable of providing a peak current (pulsed 2x577ms at T=4.615ms) of about
1.2A at 8V during an active transmission
1
. The uplink burst causes strong ripple (drop) on the
power lines. The drop voltage should not exceed 1V.
The Java 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 Java 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, Java Terminals reset or switch off. The watchdog can be configured
to restart the Java Terminals. When power fails for >15s the RTC will be reset.
Figure 11:
6-pole Western jack for power supply, ignition, reset, typical connection
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 16:
Female 6-pole Western plug for power supply, ignition, power down
Pin
Signal name
Use
Parameters
1
PLUS
Power supply
8V – 30V DC
2
PLUS
Power supply
8V – 30V 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
Ignition
U
IH
>8V
Ignition >8V for more than 200ms switches
the Java Terminals on. Ignition is activated
only by a rising edge. The rise time is
<20ms
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
