4 ms·
If you do you may have a hard time getting 1.8 amps out of the charger. D+- lines are used to negotiate, they’re also used to identify various chargers. Apple i
by milesvp 7y ago
If you do you may have a hard time getting 1.8 amps out of the charger. D+- lines are used to negotiate, they’re also used to identify various chargers. Apple is a prime example of a unique ‘footprint’ a charge chip can look at to know it’s attached to an Apple switch mode power supply and can draw more than 100mA.
I recently selected a charge chip for a work project that took care of the negotiation, so I can’t quite remember the details but it was something I had to pay attention to, and definitely needed to layout the board to use the data lines even though we don’t take data in.
- analog31 7y agoDo you remember the chip type?
- milesvp 7y agomax8895. amazing chip. saved us a lot of dev time. only major downside other than cost is you need really good fab for you pcb since it has a tiny footprint and needed to be placed on top of micro vias. It even really confused KiCad since the tolerances are unusual. I wouldn’t want to hand solder this chip either... https://datasheets.maximintegrated.com/en/ds/MAX8895V-MAX8895Y.pdf https://datasheets.maximintegrated.com/en/ds/MAX8895V-MAX889...