Does a USB PD source supply any voltage to a non USB PD compliant USB C device? If yes, how much?
The question is about USB Type-C connectivity.
The Type-C connectivity provides two methods of determining source capability.
The primary method is the value of pull-up on HOST side on CC pins. Type-C specifications define three levels of capability: 500/900 mA (56k pull-up to 5V), 1.5 A (22k pull-up), and 3A (10k pull-up). The connecting device pulls down this with 5.1k to ground, and the resulting voltage level tells the device how much current it can take over the particular connection. When the host sees the pull-down, it will turn on &quot;+5Vsafe&quot; VBUS. This is per Type-C protocol. So the Sony device is perfectly compliant to the basic +5V safe supply.
The secondary method is provided by nearly independent Power Delivery specification. If the consumer implements PD, it still need to follow Type-C specifications for CC pull-up-down protocol, and will receive &quot;+5Vsafe&quot; VBUS.
Only then the consumer will send serial PD-defined messages over CC pin to discover source capabilities. If provider responds, then negotiations for power contract will proceed.
If the consumer is not PD-agnostic, no messages will be generated and no responses will be returned, and no contract will be negotiated. The link power will stay at the default &quot;Safe+5VBUS&quot; power schema, per DC levels on CC pins.