When we troubleshoot some problems with the PMIC, we find that some interrupt registers have the following values
0x5A=0x18 ; 0x65=0x02 ; 0x66=0x01;
From the manual, we know that ENABLE_INT and BIST_PASS_INT interrupts are triggered, so we want to clear these two interrupt flags by writing 1.
However, when I went to clear the BIST_PASS_INT flag bit, it worked, but when I went to clear the ENABLE_INT flag, the PMIC power off.
I want to know if I can do this and what is the cause of the power off
Hongyao,
thank you for your answers that helps greatly.
I'm assuming from the part numbers provided that the board is powering a TI processor, correct?
Regardless of the what the end equipment is, I'm sure the device is shutting off due to power problems. Make sure that power supply is reaching 3.3V before the clearing of the interrupts. VCCA_PG_WINDOW, register 0x40 shown below from the TPS6594-Q1 Power Management IC (PMIC) for Processors with 5 Bucks and 4 LDOs datasheet (Rev. B) provides the tolerances from the input. My recommendation is to read this register and monitor the voltage during the transition to see if it's not setting the safety protection of the input FET from an overvoltage condition.
Hope that helps,
Nicholas
1.We read the value 0x40 before writing 0x65, which is 0xe
2.I have a question, why can't I find the I2C1_SPI_CRC_EN and I2C2_CRC_EN registers in the manual
We captured 3.3V of the power supply and 1.8V of the PMIC when the IIC wrote the 0x65 register through the logic analyzer
