Connecting The Uja1169Ax-Evb Into A Can Network - NXP Semiconductors UJA1169A User Manual

NXP Semiconductors
3

Connecting the UJA1169Ax-EVB into a CAN network

UM11758
User manual
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) pins to the MCU CAN controller TXD/
RXD pins
• Connect RSTN (J3-09/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
• For the UJA1169AXF-EVB, connect VEXT (J3-10) 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 UJA1169A 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 showing how to connect the UJA1169AXF-EVB between an MCU and the
CAN bus is shown in
VEXCTRL/VEXCC
PNP
VEXT
TXD/RXD
MCU
Figure 15. Connecting the UJA1169AXF-EVB into an ECU/CAN bus network
All information provided in this document is subject to legal disclaimers.
Figure 15.
V1
RST
UJA1169AXF-EVB
SPI
GND
Rev. 1 — 19 April 2022
UJA1169A evaluation boards
GND 12 V
CANH
CANL
LIMP
WAKE
ECU X
UM11758
ECU A
ECU B
ECU N
aaa-045590
© NXP B.V. 2022. All rights reserved.
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