XETK-V2.0A/C
ECU
VertiCal Base Board
(QFP)
VertiCal
Connector
VertiCal
Base
Board
QFP
µC
XETK System
Controller
GND
1K
DAI2
GND
1K
DAI1
22
22k
VCC_GPIO
22
22k
VCC_GPIO
GPIO
TOOL_IO0
TOOL_IO1
GPIO
XETK-V2.0 - User’s Guide
35
ETAS
Hardware Description
Fig. 4-17
Equivalent Circuitry of the XETK-V2.0A/C DAI Interface via VertiCal
(QFP)
To ensure proper operation of the startup protocol between ECU and XETK the
QFP VertiCal Base Board contains circuitry to respect the following topics:
• 2 GPIO pins of the microcontroller are dedicated for the DAI functions,
referred to as DAI1 and DAI2
• 22 Ohm or similar value for matched impedance series resistors on each of
the DAI signals is recommended.
• 22 kOhm pull-up resistors on each of the DAI1 signals (refer to Fig. 4-17)
is required; internal CPU pull-up may be used.
• DAI1 and DAI2 must be tri-state or an input out of reset
• DAI1 and DAI2 must be configurable first as inputs and then as outputs
for the XETK-V2.0.
The QFP VertiCal Base Boards from Freescale and ST accomplish these require-
ments with the following connections:
VertiCal Base
Board (QFP)
TOOL_IO0 (DAI1) TOOL_IO1 (DAI2) VCC_GPIO
MPC5644A_Rev1.1 GPIO203
GPIO204
VDDEH7
SPC564A80_Rev1.1 GPIO195
GPIO196
VDDEH4
4.11.3
XETK-V2.0B DAI Interface
The XETK-V2.0B uses the same DAI Interface circuitry as other serial (X)ETKs,
refer to Fig. 4-18 for the required ECU circuitry.