11 misconceptions about USB-C and PD
Time:2022-08-29
Views:1818
1. USB type-C and PD are very complex
When using a universal connector that can be plugged into a power supply or device, negotiating which device powers which device seems daunting to product designers and consumers. However, the complexity of the product may vary according to the needs of the product designer. For devices that only support type-C, an integrated circuit (IC) can be used to perform this negotiation and connection. For more complex characteristics, a power supply protocol (PD) may be implemented. To achieve usb-c PD compliance, a series of strict guidelines must be followed. The product must be reviewed by the usb-if Regulatory Committee before certification. Using firmware from a certified IC supplier can simplify the solution design.
2. USB type-C and PD are expensive
To detect, connect and negotiate communication, it seems expensive to switch from USB 2.0 to usb-c. For basic usb-c functions, a state machine controller can be used. The market price of this controller is less than 20 cents. This minimizes cost, power consumption and PCB space. In addition, with the widespread adoption of usb-c, the price of Controller ICs is also decreasing, and they become more and more energy efficient. With the popularity of usb-c, the implementation price is decreasing. The cost of including usb-c socket and controller in the system is less than 20 cents.
3. All type-C ports have the same function
Although it is a universal connector, the actual characteristics of the usb-c port may vary greatly. The port of the travel adapter only charges the device, and the wearable device port usually only accepts charging. The ports of dual role devices such as laptops can be charged or charged. The power level limit of the standard type-C port is 15W. And up to 100 W if the PD protocol is implemented. In addition, the data communication of some ports can reach the speed of USB super speed Gen 2 10Gbps. Other features may include display ports or support for thunderbolt.
4. All type-C cables are the same
Although all usb-c cables have the same pin arrangement and can be inserted into any usb-c port, it does not necessarily mean that their electrical characteristics and characteristics are the same. The rated current of the standard cable is 3a, and the length is less than 4m. Cables shorter than 2 meters or need to support 3-5a need an electronic marker IC, i.e. e-marker. The cable may also be "fully functional", for example, supporting up to 4K HD video. As mentioned above, the full-function cable may actually have more wires, and additional bandwidth can be realized. The type-C specification enables designers to use only the features required by their ports, thereby reducing complexity and cost. With the maturity of the market, more and more schemes have been optimized for a given market demand.
5. USB type-C is another cable that needs to be purchased
Although the usb-c cable is unique, the adoption rate of the usb-c shape is high, and the usb-c cable is more and more common. The trend is that this cable will eventually become the only cable that consumers need. If the same cable can be used to charge the PC from any charger, charge the phone and any wearable device, the number of cables required by consumers will eventually be reduced.
6. Type-C cable is only an interface different from type-A and type-B
Type-C using PD is far superior to type-A and type-B in power supply and data rate. Although the power capacity of type-A and type-B BC 1.2 has been developed to a maximum of 7.5W, the usb-c PD can negotiate the power to a maximum of 100W. The maximum data rate of USB SS Gen 1 is 5Gbps, while the maximum data rate of Gen 2 is 10Gbps. The latest update also supports the simultaneous use of TX and Rx lines, further doubling the effective data rate.
7. Type-C cable is only used for data and charging small electronic products
Of course, usb-c is universal. It can not only supply power for phones and small wearable devices, but also supply power for PCs, household appliances and even industrial equipment with a power rating of less than 100W.
8. I still need a 3.5mm jack to listen to music
This is not a problem. Usb-c supports audio acquisition based on the connector. The usb-c cable has a dedicated D + / d-pin to support audio signals. SBU pins can also be used for microphone and ground signals. Some earphone manufacturers are developing earphones using usb-c connectors, while many manufacturers are developing dongles. Dongle is a small adapter with a 3.5mm jack at one end and a usb-c at the other end. It supports consumers to continue to use their favorite 3.5mm headphones. Although the sound quality may be degraded due to the installation of dongle, many consumers choose this cheap option instead of replacing their headphones immediately.
9. Usb-c no longer supports analog audio
Many people think that all audio must be digital if transmitted through usb-c. This is not the case. Many electronic platform designers will continue to use analog audio. There is a clause in the USB specification that if the system uses analog audio, it must also support digital audio.
10. I can‘t charge and listen to music at the same time
Although usb-c has various functions, such as charging, transmitting data and listening to audio, some people still find it difficult to use because its device has only one port. The initial assumption was that the usb-c port can only support one function at a time. However, the usb-c specification allows multiple functions to be performed on the same port at the same time. The usb-c specification specifies the allowable accessory support for this purpose. Consumers can purchase dongle with usb-c input and multiple outputs to realize simultaneous charging, data transmission and audio listening.
11. The video quality based on USB port is too poor
This is not the case. The usb-c feature is certainly superior to the USB 2.0 feature. Usb-c specification includes "alternate mode". These function extensions support non-standard USB protocols, such as display port and thunderbolt transmission via usb-c connector. Usb-c supports 4K HD video based on super speed pin. The usb-c connector truly combines the power, data, video and audio protocols of the leading industry into a fashionable and flexible shape.
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