Other Parts Discussed in Thread: LP8758, TLV62568, INA195, ADC128D818
What is involved in getting a specific OTP arrangement? I need to support a system that doesn't necessarily have I2C available to light it up, and I want to ensure that I never assert an out-of-bounds voltage that fries my ICs.
I'm looking for...
* VOUT1/2/3/4 = 0.9V
* EN1/EN2 = Don't Care and pulled down (I want to leave them no-connect.)
* General power control by asserting nRST (low = regs off, high = startup to regs on).
* INTn asserted when regs are not in regulation, negated when they are (that is, the behavior of wired-or PGOOD.) This feeds to my system reset.
The idea is that the LP8758 would self-start to provide 4 core voltages, controlled by the PGOOD output of the I/O voltage (1.8V in my case, coming from a part like the TLV62568 or similar reg with PGOOD.) I2C would then only used for margining and measuring currents, not for startup.
I would be replacing ... 4 1.5A DCDC's, 4 INA195's, a DS4424 quad DAC, an ADC128D818 8-channel ADC and a great big handful of passives.
