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NXP Semiconductors
UM11379
UJA116xA evaluation boards
3.2 Connecting boards with an SPI (UJA1164A/68AF/68AXF-EVB)
The following conditions must be met before powering up the system with a 12 V supply:
•
Connect all boards in the ECU to a common GND
•
Connect SPI pins to the MCU SPI master:
–
SDO (J3-03, J4-09) → MISO
–
SDI (J3-04, J4-07) → MOSI
–
SCK (J3-05, J4-11) → SCK
–
SCSN (J3-06, J4-05) → CS
•
Connect TXD/RXD (J3-01/J3-02, J4-18/J4-20, J9-09/J5-05) pins to the MCU CAN
controller TXD/RXD pins
•
Connect RSTN (J9-09/J5-05) to the MCU CAN controller reset pin
•
Connect CANH and CANL (J1-01/J1-02) to the CAN bus twisted-pair cables
•
Connect V1(J3-08, J5-03) to the MCU supply unit
•
Connect INH (J3-10) on the UJA1168AF-EVB to the control/enable pin on the ECU
supply unit (optional)
•
Connect VEXT (J3-10) on the UJA1168AXF-EVB to the peripheral loads that need a
5 V supply (optional)
Once the above steps have been completed, the ECU/EVB can be powered up using an
external battery supply. The UJA116xA starts up in Forced Normal mode (if MTP is not
configured) or Standby mode (if MTP configured), awaiting commands from the MCU via
the SPI interface.
An example of how to connect the UJA1168AF-EVB between an MCU and the CAN bus
aaa-040315
ECU A
MCU
TXD/RXD
V1
CANH
GND
12 V
CANL
GND
ECU X
ECU B
ECU N
RST
PMU
INH
SPI
UJA1168AF-EVB
Figure 12. Connecting the UJA1168AF-EVB in an ECU/CAN bus network
UM11379
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© NXP B.V. 2021. All rights reserved.
User manual
Rev. 1 — 23 April 2021
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