I am trying to figure out the first power up of the imx8mp.
I am implementing the powering of the imx8mp with PMIC PCA9450C, I want not to use ONOFF signal of the imx8mp because in my application there is not a power button.
According to the PMIC datasheet, PMIC_ON_REQ must be high to go into “PWRUP Seq” state.
Thanks and BR.
Solved! Go to Solution.
Hi @Yuri , thanks for your reply.
I don’t want to use a power button. In my application the system needs to be run after 12V main power supply is applied, without touching any button.
So, according your answer, will I need some electronic to generate a low pulse in ONOFF signal when SNVS is powered to set high PMIC_ON_REQ?
According to datasheet PMIC_ON_REQ has pull up at reset so PMIC will enable all rails, but in table “6-39 Power mode transitions” there is a sequence for the power mode “ON, first time” that says the power button is pushed to set PMIC_ON_REQ high.