Q: AM17x LDO Power Supply Reference by 1129650

For the processor, RESET pin has to be asserted when the voltages are ramping and should be released once all the voltages are ramped.

The reference design (Power Solution using LDO's, slvr343a.pdf) does not mention RESET; what can I do?

 

A: Re: AM17x LDO Power Supply Reference by 1129650

I recommend using the TPS3307-18, Triple Processor Supervisor.

This IC monitors a 3.3V output, a 1.8V output and an adjustable output and will drive reset low during power up. 

However, the adjustable sense input on the TPS3307-18 can only monitor down to 1.25V (typ) so the PG output of the 1.2V supply (TPS74801) will have to be connected to the adjustable sense input on the TPS3307-18.