Q. i dont know why INT's pin connect REF_CLK_24M.
A. Actually, REF_CLK_24M is the regular multipurpose I/O pin, as most of other processor's pins, whose function is controlled by the IOMUX module. Here, the REF_CLK_24M pin is just used as the interrupt-enabled GPIO input.
Q. VDD_ARM_IN1 value and VDD_ARM_CAP value have what differences?
A. It depends on which mode the built-in Power Management Unit (PMU) module operates in. In LDO bypas mode, VDD_ARM_IN is equal to VDD_ARM_CAP. In case of LDO enabled mode, it depends on the value of VDD_ARM_IN and the LDO regulation setpoint, selected in the PMU_REG_CORE registed in software. The default setpoint value is 1.1V. Note that, for normal regulation, the LDO input voltage (VDD_ARM_IN) should be at least 150mV higher than the output setpoint.
Have a great day,
Artur
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