TUSB319-Q1: Current Negotiation Issues

Brandon Magnan

Part Number: TUSB319-Q1

I just made a board using the TUSB319 device, and I'm having difficulty getting consistent charging currents.

I tried charging the tablet last night after a full discharge. When it was plugged into the TUSB319 device, the tablet came on with auto-boot but the current measurements were inconsistent. When the tablet is fully charged, it'd show 54mA (I'm expecting 3A based on the TUSB319 settings). When fully discharged it jumped around between 2.8A, 54mA and 0mA before settling on 0mA even though the tablet indicated it was plugged in.

Any ideas on what might be going on?

over 5 years ago

0 Brian Zhou over 5 years ago

TI__Guru** 122515 points

sorry for late reply due to holiday. Do you use TI evm? what status for ID pin?

0 Brandon Magnan27 over 5 years ago in reply to Brian Zhou

Prodigy 80 points

Here is a picture of the schematic. This is on a custom board.

0 Brandon Magnan27 over 5 years ago in reply to Brian Zhou

Prodigy 80 points

Here is a picture of the schematic. This is on a custom board.

0 Michael Campbell over 5 years ago in reply to Brandon Magnan27

TI__Intellectual 1800 points

The TUSB319 indicates the current capability of the charger thru the voltage on the CC pin. How much current consumed is determined by the sink. Please measurement CC pin voltage when notebook or tablet is connected. ID pin should be low.

CC pin voltage when advertising 500mA: 0.25V to 0.61V

CC pin voltage when advertising 1.5A: 0.7V to 1.16V

CC pin voltage when advertising 3.0A: 1.31V to 2.04V

Interface

Interface forum

TUSB319-Q1: Current Negotiation Issues