ETAS
Hardware Description
XETK-S21.0B
-
User
Guide
20
4.5
Power Supply
The XETK-S21.0 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-S21.0 will also accept voltage dips down to 3V, for a max
-
imum duration of 15ms (for additional details of low voltage operation, see ISO
standard 16750)
From the input battery voltage, the XETK-S21.0 creates all necessary voltages
through switching power supplies on the XETK-S21.0. The power supply of the
ECU is not affected by the XETK-S21.0. An automatic switch ensures that the
power supply of the XETK-S21.0 is automatically switched on and off when the
XETK enters and leaves its standby (sleep) mode.
The XETK-S21.0 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
-
5
Location of the XETK-S21.0 Power Supply Connectors
CON7
CON4
