Part Number:BQ25890
Hello
I have a problem with Input Source Type Detection with BQ25890. All USB (PC, USB charger, power supply with shorted D+/D- pins) is detected as Unknown Adapter.
I measured state of DSEL pin with oscilloscope and i think it has wrong polarity.
DSEL pin description in Datasheet:
Open-drain D+/D- multiplexer selection output. Connect the DSEL to a logic rail via 10-KΩ resistor. The pin is normally float and pull-up by external resistor. During Input Source Type Detection , the pin drives low to indicate the bq25890 D+/D- detection is in progress and needs to take control of D+, D- signals. When detection is completed, the pin keeps low when MaxCharge™ adapter is detected. The pin returns to float and pulls high by external resistor when other input source type is detected.
I measured during input source type detection high and then go back to low. (oscilloscope screenshot in attachment).
My connection is the same as connection in EVM. Why the DSEL signal si inverted against the datasheet.
There is schematic in attachment.