XETK-V2.0 - User’s Guide
23
ETAS
Hardware Description
For a complete list of the pins of the XETK-V2.0A/C ECU interface refer to
section 7.11.1 on page 72 and to section 7.11.3 on page 79 for the XETK-V2.0B
ECU Interface. In general the interface of each device consists of:
• ECU voltage lines, which are not used for powering the XETK, but for
detecting the ECU status; therefore the power consumption on these lines
is negligible (refer to chapter 4.4 on page 23)
• Data Acquisition Interrupt lines (DAI lines) which are used for XETK syn-
chronization at startup and for Data Acquisition (refer to chapter 4.11.4
and 4.11.5)
• Reset lines which allow the XETK to both monitor and control the system
reset of the ECU (refer to chapter 4.7 on page 26)
• JTAG Interface used as the measurement and calibration interface
between the XETK-V2.0 and the microcontroller (refer to chapter 4.9
on page 29)
• Nexus Auxiliary Interface used as an optional measurement interface
between the XETK-V2.0 and the microcontroller
4.4
Power Supply
The XETK-V2.0 needs a permanent power supply. It is powered directly from the
car battery. The input voltage may vary between 4.3 V and 36 V
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Fig. 4-7
Power Supply monitoring
All necessary voltages required by the XETK are created through switching power
supplies which minimizes heat build-up. The power supply of the ECU is not
affected by the XETK-V2.0. An automatic switch ensures that the power supply
of the XETK-V2.0 is automatically switched on and off. The ECU voltage VCC
(V_RESET for XETK-V2.0A/C and V_NEXUS for XETK-V2.0B) is monitored by the
XETK to recognize whether the ECU is switched on or off.
The XETK-V2.0 must be supplied with power through the 2-pin power supply
connector CON2 in Fig. 4-8 below.
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N
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Fig. 4-8
Power Supply Connector CON2 (left: XETK-V2.0A/C, right: XETK-
V2.0B)