DLPS074 February 2017 DLPC4422
It is difficult to set up a power monitor to trip exactly on the DLPC4422 device minimum supply voltage spec. Thus for practical reasons, TI recommends that the external power monitor generating POSENSE target its threshold to 90% of the minimum supply voltage specs and ensure that POSENSE remain low a sufficient amount of time for all supply voltages to reach minimum device requirements and stabilize. Note that the trip voltage for detecting the loss of power, as well as the reaction time to respond to a low voltage condition is not critical for POSENSE as PWRGOOD is used for this purpose. As such, PWRGOOD has critical requirements in these areas.