XETK-S4.2 - User’s Guide
19
ETAS
Hardware Description
4.4
Power Supply
The XETK-S4.2 requires a permanent power supply. It is typically powered
directly from the car battery. The input voltage may vary between 4.3 V and
36 V. In case of higher input voltages to the XETK, additional voltage protection
is required. The XETK-S4.2 will also accept voltage dips down to 3V, for a maxi-
mum duration of 15ms (for additional details of low voltage operation, see ISO
standard 16750)
From the input battery voltage, the XETK-S4.2 creates all necessary voltages
through switching power supplies on the XETK-S4.2. The power supply of the
ECU is not affected by the XETK-S4.2. An automatic switch ensures that the
power supply of the XETK-S4.2 is automatically switched on and off when the
XETK enters and leaves its standby (sleep) mode.
The XETK-S4.2 can be supplied with power through the seven pin connector,
CON7. The through-hole solder pad CON4 can be used additionally to connect a
power supply U
Batt2
.
The power supply on CON4 must use the GND of CON7 pin 3.
Fig. 4-4
Location of the XETK-S4.2 Power Supply Connectors
CON7
CON4
