Hi all,
we implemented LP87565 as a companion to a PMIC in a quiet comprehensive system. PGOOD output of LP87565 is evaluated by a supervision µC in order to check the power supply state.
We intended to check this functionality and switched off buck 0 ... 3 of LP87565 by I2C. Though buck 0 ... 3 had been disabled (voltages went to ground) the PGOOD remained High.
I think the PGOOD register are set correctly. What could be the reason for?
===== Press 1 for LP87565 Buck0...3 off:
1
========== LP87565 Buck0...3 off: ===========
Register: 0x28 , PGOOD_CTRL1: 0xff
Register: 0x29 , PGOOD_CTRL2: 0x86
Register: 0x2a , PGOOD_FLT : 0x0
========== Buck0...3 disabled ==========
========== Done! ==========
regards