ETAS
Hardware Description
XETK-S22.0 - User’s Guide
30
4.15
Reset
The requirement for XETK reset mechanism is to ensure that power-up and
power-down behavior of ECU is clean and smooth. The XETK-S22.0 drives /
PORESET low during XETK power up or upon INCA request.
The XETK-S22.0 senses the status of the /PORESET line to detect when the
ECU is in reset. If configured, and the microcontroller has /RESETOUT, the
XETK-S22.0 can also be used to sense the status for the ECU reset.
The XETK-S22.0 senses the switched ECU power supply, VDDP. This allows the
XETK to detect when the ECU is off and forward the information to INCA. In
addition, it allows the XETK to enter the power save mode when the calibration
system is unplugged.
4.16
Pull CalWakeUp until Startup Handshake
The XETK has the ability to wake up the ECU by applying voltage to the Cal-
WakeUp pin of the ECU connector. This allows the XETK to configure a mea-
surement while the ECU is off.
When waking up the ECU via the CalWakeUp pin, it can be configured if the pin
is driven high until the microcontroller core voltage (VDD) is high or if the pin
should be driven high until the start-up handshake between ECU and XETK is
complete.