
BR_XETK-S2.0 - User’s Guide
25
ETAS
Hardware Description
4.11
Power Supply
The ETK-T2.2G needs a permanent power supply. It is powered directly from the
car battery. The input voltage may vary between 4.3 V and 18 V.
The ECU voltage (U
SG
) is monitored by the ETK to recognize whether the ECU is
switched on or off. In case of higher input voltages to the ETK an additional
voltage converter is required. All necessary voltages are created through switch-
ing power supplies which minimizes heat build-up. The power supply of the ECU
is not affected by the ETK-T2.2G. An automatic switch ensures that the power
supply of the ETK-T2.2G is automatically switched on and off.
Fig. 4-6
Power Supply Connectors CON2 and CON3
The ETK-T2.2G can be supplied with power through the 2-pin power supply con-
nector CON2. Additionally the through-hole solder pad CON3 can be used to
connect a power supply U
Batt2
. The power supply on CON3 must use the GND of
CON2.
Fig. 4-7
Power Supply Connector CON2