ETAS
Hardware Description
ETK-S20.1
-
User Guide
25
4.13
Reset
The requirement for ETK reset mechanism is to ensure that power-up and
power-down behavior of ECU is clean and smooth. The ETK-S20.1 normally
drives /PORST low during ECU power up or upon INCA request.
The signal /ESR0 of the microcontroller is used by the ETK-S20.1 to detect
when the ECU is in reset.
The ETK-S20.1 senses the switched ECU power supply. This allows it to detect
when the ECU is off and forward this information to INCA. In addition, it allows
the ETK to enter the power save mode with the calibration system (ES590/
ES591) unplugged.
4.14
Pull CalWakeUp until Startup Handshake
The ETK has the ability to wake up the ECU by applying voltage to the
CalWakeUp pin of the ECU connector. This allows to configure a measurement
while the ECU is off.
When waking up the ECU via the CalWakeUp pin it can be selected if the pin is
pulled until the microcontroller core voltage (VDDP) is high or the pin should be
kept on high state until the start-up handshake between ECU and ETK signals
the ETK that the ECU has finished its initialisation.
4.15
Firmware Update
The firmware of the ETK can be updated by the user so that future versions of
the ETK can also be implemented. The firmware is updated on the connected
PC using service software "Hardware Service Pack" (HSP).
NOTE
Neither the power supply nor the Ethernet connection must not be interrupted
during a firmware update!
