NXP Semiconductors UJA1169A, User Manual, Page: 24 / 39

NXP Semiconductors
UM11758
UJA1169A evaluation boards
6.2.2 HW setup for FlexGUI operation
The watchdog in the SBC must be off while the FlexGUI is running. The watchdog is
always off in Forced Normal mode and off by default in Software Development mode (a
sample script for switching the device to Software Development mode via the FlexGUI is
included in Section 6.4.6 ).
A system reset is generated after programming the MTPNV memory, after which the
connection between the FlexGUI and the board will need to be re-established (see
Section 6.4.2 ). If the reconnection fails, try again after a power-off/wait-3-seconds/power-
on sequence on the UJA1169Ax-EVB.
Once the FlexGUI firmware has been installed on the microcontroller board, the
jumpers on the boards need to be set as illustrated in Figure 23 before plugging the
UJA1169Ax-EVB into the microcontroller board. The resulting supply and data line
interconnections between the boards are shown in Figure 24 . Note that only the relevant
header interconnections are shown in the schematics extract in Figure 24 . See the full
board schematics for further details.
Figure 23. UJA1169Ax-EVB/S32K144EVB jumper settings for FlexGUI operation
UM11758 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2022. All rights reserved.
User manual Rev. 1 — 19 April 2022
24 / 39