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25 | Hardware Description
3.11
Reset
The requirement for the BR_XETK-S1.0 reset mechanism is to ensure that power-
up and power-down behavior of ECU is clean and smooth. The BR_XETK-S1.0 nor-
mally drives /PORST low during XETK power up or upon INCA request.
The signals /PORST and /ESR0 of the microcontroller are used by the BR_XETK-
S1.0 to detect when the ECU is in reset.
The BR_XETK-S1.0 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.
3.12
Pull CalWakeUp until Startup Handshake
The XETK has the ability to wake up the ECU by applying voltage to the CalWakeUp
pin of the ECU connector. This allows the XETK to configure a measurement 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.
ETAS BR_XETK-S1.0 | User Guide
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