NXP Semiconductors
UM11379
UJA116xA evaluation boards
3 Connecting the UJA116xA to a CAN network
3.1 Connecting boards without an SPI (UJA1161A/62A/63A/66A-EVB)
The following conditions must be met before powering up the system with a 12 V supply.
Common to all boards:
•
Connect all boards in the ECU to a common GND
•
Connect pin CTS (J3-03, J4-09) to an MCU IO input pin
•
Connect pin STBN/SLPN (J3-06, J4-09) to an MCU IO output pin
•
Connect TXD/RXD (J3-01/J3-02, J4-18/J4-20) pins to the MCU CAN controller TXD/
RXD pins
•
Connect CANH and CANL (J1-01/J1-02) to the CAN bus twisted-pair cables
Board specific:
•
Connect VIO (J3-09, J5-03) on the UJA1161A-EVB, UJA1162A-EVB and UJA1166A-
EVB to the MCU supply unit; VIO shares the MCU IO supply
•
Connect RST (J3-09, J5-05) on the UJA1163A-EVB to the MCU CAN controller RSTN
pin
•
Connect V1 (J3-08, J5-03) on the UJA1163A-EVB to the MCU supply unit
•
Connect V1 (J3-08, J5-03) on the UJA1166A-EVB to the application circuit to be
supplied from V1
•
Connect INH (J3-10) on the UJA1162A-EVB and UJA1166A-EVB to the control/enable
pin on the ECU supply unit (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 Standby mode and then switches
between Standby/Sleep modes and Normal mode depending on the level on pin STBN/
SLPN.
An example of how to connect the UJA1163A-EVB between an MCU and the CAN bus is
UM11379
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User manual
Rev. 1 — 23 April 2021
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