Quote:
Originally Posted by patrickt
Please explain why a phone, a laptop, and earphones can use USB C but an ereader couldn't.
|
Personally I won't buy ANYTHING that needs a USB-C power supply or has USB-C host outlets.
Engineering wise it's a spec ASKING for trouble. A device telling host what VOLTAGE to apply?
The standard solution is that apart from naked cell / battery chargers (Lead Acid Car battery, or Lithium pack with no internal charger) is that a connector from a host or a power supply ONLY supplies a fixed voltage.
The existing USB charge currents other than C are NOT decided by the host, they are only 5V (+/- 0.2V) and the slave gadget examines the D- or D+ pins to see if more than 100mA can drawn. If you only wire +V and 0V, you get 5V and the current supply is whatever the host can do and the slave may take only 100mA or 500mA max depending on era.
USB-C is stupid.