Checking the schematic of the lpcxpresso55s69 dev board, I coudn't find all the PLU_IN1 in the expansion connectors. Any idea?
From the user manual of LPC55S69, we see that the PLU_IN1 is multiplexed with PIO0_14, which is the node of FC1_I2C_SCL, so the PIO0_14/PLU_IN1 pin is connected to pin11 and pin12 of P19 connector.
Hope it can help you
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