3 ms·

You don't need e-marking for 3A charging. A non e-marked cable can deliver up to 60W (3A@20V). It must route the CC pin to be able to negotiate a higher voltage

You don't need e-marking for 3A charging. A non e-marked cable can deliver up to 60W (3A@20V). It must route the CC pin to be able to negotiate a higher voltage (>15W 3A@5V), but this is (spec) required for all USB-C cables. Edit: I should add that it is possible for a fully complaint combination of devices to not charge at max(sink power, source power), because not all possible combinations of voltage and current may be supported. For example a 60W charger may support 20V@3A, but if the 60W sink only supports 12V charging, it needs 5A and this combination won't support 60W charging. In practice this should be rare though, it would be terrible product design.

deleted 4y ago
[deleted]
arcticbull 4y ago
You're totally right, in part I confused >60W with >=60W, and as you rightly point out, non-marked cables should support 20V/3A. Re: your edit. There is this exact kind of profile incompatibility between the Leviton T5636 and the HomePod mini when two devices are plugged in. The outlet should support 30W for each receptacle, which is more than enough to provide the 18W/20W the HomePod mini requires. But for some PD profile incompatibility reason (9V/3A probably), it does not get enough power. And it is in fact terrible product design. Leviton is pointing the finger at Apple but in reality, who knows.
- error503 4y ago
  > Which source? The charger or the device? Because either could be at fault. IMO it's harder for the source to be flexible with voltage, and especially current limit, so I'd put somewhat more blame on the sink here for not being flexible enough. Generally a sink should expect to be plugged into an 'unknown' source, so should at least make an effort to support multiple voltages. Designing a multiport power source with a shared power limit is a bit of a tricky problem.

3 ms·

You don't need e-marking for 3A charging. A non e-marked cable can deliver up to 60W (3A@20V). It must route the CC pin to be able to negotiate a higher voltage

by error503 4y ago

deleted 4y ago
[deleted]
arcticbull 4y ago
You're totally right, in part I confused >60W with >=60W, and as you rightly point out, non-marked cables should support 20V/3A. Re: your edit. There is this exact kind of profile incompatibility between the Leviton T5636 and the HomePod mini when two devices are plugged in. The outlet should support 30W for each receptacle, which is more than enough to provide the 18W/20W the HomePod mini requires. But for some PD profile incompatibility reason (9V/3A probably), it does not get enough power. And it is in fact terrible product design. Leviton is pointing the finger at Apple but in reality, who knows.
- error503 4y ago
  > Which source? The charger or the device? Because either could be at fault. IMO it's harder for the source to be flexible with voltage, and especially current limit, so I'd put somewhat more blame on the sink here for not being flexible enough. Generally a sink should expect to be plugged into an 'unknown' source, so should at least make an effort to support multiple voltages. Designing a multiport power source with a shared power limit is a bit of a tricky problem.