ETAS
Hardware Description
ETK-S20.1
-
User Guide
20
4.5
Power Supply
The ETK-S20.1 needs a permanent power supply. It is powered directly from
the car battery. The input voltage may vary between 5
V and 36
V (3
V drops for
3 seconds). In case of higher input voltages to the ETK an additional voltage
converter is required.
All necessary voltages are created through switching power supplies which
minimizes power dissipation. The power supply of the ECU is not affected by
the ETK-S20.1. An automatic switch ensures that the power supply of the ETK-
S20.1 is automatically switched on and off when the ETK enters and leaves its
sleep mode.
The ETK-S20.1 can be supplied with power through five pins connector CON7.
The 2 pin JST connector CON3 can be used additionally to connect a power
supply U
Batt2
. The power supply on CON3 must use the GND of CON7 (refer to
chapter 5.2.2).
Fig.
4
-
5
Location of the Power Supply Connectors (ETK-S20.1)
4.6
ECU Voltage Supervisor
The ECU voltage (VDDP) is monitored by the ETK to recognize whether the ECU
is switched on or off. The ETK-S20.1 supplies the ECU EDRAM and monitores
this voltage.
NOTE
The ETK-S20.1 allow switching between reference page and working page
only, if there is a valid voltage at the sense pin detected.
CON3
CON2