Hello all,
I'm trying to understand the power up and power down sequencing requirements for the DM365 and DM368. As per section 6.4.2, I'd like to use the "restricted power-on and power-off method." For power on, this seems straightforward. I'd like to use a simultaneous power on approach where I use the SS/TR tracking function of the various buck power supplies to simultaneously ramp the rails like this:
RESET will always be held low during power supply ramp up and ramp down.
I understand the required power on sequence, but I do not understand the required power off sequence. In the notes on section 6.4.2, the datasheet states that "the main core must be powered down last." Does that mean that it must begin ramping down last (as shown in the diagram above), or that it can only begin ramping down after the 1.8 and 3.3V rails have reached 0V? In other words, does the figure shown above represent the proper way of ramping up and ramping down the rails for the DM36x?
Many thanks!
Mike
