ETAS
Hardware Description
XETK-S30.0 - User’s Guide
25
4.10
Timer Triggering
The trigger mode "Timer Triggering" uses four internal timers of the
XETK-S30.0 for triggering. A fixed configurable period is used for triggering.
The time intervals between trigger events are in accordance with the config-
ured timer values. This values and their resolution have to be defined in the A2L
file. Available settings are:
• Minimum time interval 100 µs
• Maximum period duration 1 s
• Timer resolution 1 µs
The timers work in an asynchronous manner to the ECU.
4.11
Reset
The requirement for the XETK-S30.0 reset mechanism is to ensure that power-
up and power-down behavior of ECU is clean and smooth. The XETK-S30.0 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
XETK-S30.0 to detect when the ECU is in reset.
The XETK-S30.0 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-
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 (VDDP) is high or if the pin
should be driven high until the start-up handshake between ECU and XETK is
complete.
