ETAS
Hardware Description
BR_XETK-S3.0
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User Guide
28
4.10
Reset
The requirement for the BR_XETK-S3.0 reset mechanism is to ensure that
power-up and power-down behavior of ECU is clean and smooth. The BR_X
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ETK-S3.0 normally drives /PORST low during XETK power up or upon INCA
request.
The signals /PORST and /ESR0 of the microcontroller are used by the BR_X
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ETK-S3.0 to detect when the ECU is in reset.
The BR_XETK-S3.0 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.
4.11
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 IO voltage (VDDPSTBY) is high or if the
pin should be driven high until the startup handshake between ECU and XETK
is complete.
NOTE
The reset signal /PORST can be hold or pulled low while the BR_XETK-S3.0 is
booting depending on the use the adapter ETAM8A or the adapter ETAM8B
(see chapter “ETAM8 ECU Adapter” on page
76). The BR_XETK-S3.0 has to be
configured in the XCT tool according to the needed reset signal characteristic
during BR_XETK-S3.0 standby.
NOTE
The CalWakeUp function is optional and not essential for the operation of
BR_XETK-S3.0. Use of this function requires support of ECU hardware.
