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PWR_RDY bit is always high, on MAXM86161

Category: Hardware
Product Number: MAXM86161

On my custom board, I'm trying to work MAXM86161 connected to the MCU directly according to Pin Description on the datasheet page 14.
But the PWR_RDY bit on the Interrupt Status 1 register is always high, even though the register is read or setting SHDN bit to 1.
I cannot set INTB signal high and the interrupt status waiting.
What should I check to clear this problem?