ETAS
Hardware Description
XETK-S31.0
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User
Guide
23
4.11
Reset
The requirement for the XETK-S31.0 reset mechanism is to ensure that power-
up and power-down behavior of ECU is clean and smooth. The XETK-S31.0 nor
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mally drives /PORST low during XETK power up or upon INCA request.
The signals /PORST and /ESR0 of the microcontroller are used by the XETK-
S31.0 to detect when the ECU is in reset.
The XETK-S31.0 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 XETK to enter the power save mode with the calibration system
unplugged.
4.12
Pull CalWakeUp until Startup Handshake
The XETK has the ability to wake up the ECU by applying voltage to the Cal
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WakeUp pin of the ECU connector. This allows the XETK to configure a mea
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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 (VDDP) is high or if the pin
should be driven high until the start-up handshake between ECU and XETK is
complete.
