Hello,
I am working on integrating a PMIC design with the i.MX 8M Mini, and I am looking for information on the 8M Mini’s power consumption when POR_B is asserted.
In my application, power can be disconnected at any point from the processor, so I want to make sure there is enough hold-up capacitance to keep the PMIC and processor powered for long enough to turn off the voltage rails in the proper order. Whenever power is disconnected, POR_B is asserted and holds the processor in reset. To determine how much capacitance I need, I need to know how much power the processor uses while in reset, as well as how quickly this power consumption is reached after POR_B is asserted.
In my use case, the 8M Mini may be doing a lot of computations and consuming over 2 watts of power. If power is disconnected while this is happening, POR_B is immediately asserted. Once POR_B is asserted, I’m sure the 8M Mini will eventually enter reset mode and consume much less power than active mode, but nothing happens instantly. So, how long will it take to reach the steady-state power consumption of reset mode? If, after POR_B is asserted, the processor continues to consume 2W of power for 100ms before going into reset, I’ll need to include much more capacitance than if it only take 100us from POR_B assertion to go into reset.
Additionally, once POR_B has been asserted, how long does it take for SD3_RST and DRAM_RESET to assert?
Thanks!
