Hello
I made rather basic USB fast charging circuit using schematic in “MP2731 USB PD Reference Design
4.5A, NVDC Single-Cell Charger with OTG” document. I managed to get 5.2v to MP2731. However there was no refference as to how to set up MP2731. I set up i2c device, enabled output connected battery and the indication light is flashing in 1Hz intervals showing an issue. When I check 0x0D register (fault register) I get no faults. Same with status register that shows 0x01. I tried to check voltages from registers and got varying results:
It shows there is no battery voltage even though chip turns on when I connect the battery. And Vinput voltage is changing from 3.xx to 7.xxx volts constantly.
Any ideas what else can I check?
I do not have the specialized I2C MPSbus device, I am controlling device from chip on my own schematic exclusively
Any help would be appreciated.
-Raivis