XETK-V2.0A/C
ECU
VertiCal Base Board
(522 / 422 / 330 / 214)
VertiCal
Connector
VertiCal
Base Board
Balls
µC
Ball R19 (VertiCal 422/522)
Ball N16 (VertiCal 330)
Ball K19 (VertiCal 214)
TOOL_IO2
Pin 28
TOOL_IO2
Pin N22
TOOL_IO2
Watchdog
1= disable
0= enable
XETK Configuration Tool /
ProF (BDF):
ECU Watchdog Control
Nexus
Connector
(Samtec)
10k
GND
XETK
System
Controller
1K
3.3V
GND
75K
XETK-V2.0 - User’s Guide
32
ETAS
Hardware Description
Fig. 4-14
Equivalent Circuitry of the XETK-V2.0A/C WDT Interface via VertiCal
(BGA)
Prior to being used as the WDT disable interface, the signal TOOL_IO2 is addi-
tionally used as a tool detection interface by the XETK-V2.0A/C and other tools.
This is required to determine if the tool is directly connected to the ECU or is
connected to the ECU behind another tool. The XETK-V2.0A/C reads the
TOOL_IO2 signal at power up to make this determination. If the signal is low, the
XETK-V2.0A/C is directly connected to the ECU. If the signal is high, the XETK-
V2.0A/C is connected to the ECU via another tool.
To ensure proper operation of the startup protocol the XETK-V2.0A/C and other
tools the ECU circuitry has to respect the following topics for TOOL_IO2:
• When the external WDT disable function is required, a 10 kOhm pull-
down resistor on TOOL_IO2 is required (refer to Fig. 4-14).
• When the external WDT disable function not required, TOOL_IO2 is left
unconnected or pulled down via 10 kOhm resistor.
• TOOL_IO2 is never pulled up or driven high without the XETK or other tool
present. This would cause the XETK to detect another tool is present
between the ECU and XETK. Only the XETK or other tools (e.g. Lauterbach
debugger) must drive this signal high, but only after the tool detection
phase.
• Any ECU circuitry connected to TOOL_IO2 must not violate the XETK’s
signal characteristics defined within the section "Electrical Characteris-
tics" on page 56. TOOL_IO2 is not 5 V tolerant.
The ECU must be equipped with a Watchdog disable circuit and a BGA VertiCal
Base Board with optional balls when this feature is required.
This functionality is not available with a QFP VertiCal Base Board.
CAUTION!
Risk of damaging the XETK due to over voltage on TOOL_IO2!
The
XETK-V2.0
signal TOOL_IO2 is not 5 V tolerant, refer to the sec-
tion "Electrical Characteristics" on page 56 for the complete electrical
specification of the TOOL_IO2 pin
.
Note
Note
