Other Parts Discussed in Thread: TPS22965,
Hi,
We are using the REGEN1 pin of TPS659161RGZR device to Enable/Disable TPS22965 as recommended in TPS65916 User’s Guide at http://www.ti.com/lit/ug/slvuao4a/slvuao4a.pdf.
We see that REGEN1 is an open-drain pin and a pull-up to VDDS18V (SMPS4) is recommended at https://e2e.ti.com/support/applications/automotive/w/design_notes/3472.what-voltage-can-the-open-drain-gpios-be-pulled-up-to. We understand that after PMIC supply is up, it will pull REGEN1 signal low until the desired time as per sequencing and then leave it floating which will provide 1.8V (from SMPS4) at Enable input of TPS22965. However, what happens during the time between PMIC supply-up to REGEN1 assertion (low). The REGEN1 is in high impedance state during this time and TPS22965 datasheet mentions, "This pin cannot be left floating and must be driven either high or low for proper functionality." What is the duration between PMIC supply-up to REGEN1 assertion? Is this duration small enough for AM571x devices to be neglected?
Please let us know your thoughts on the same.
Regards
Raja
