Renesas Electronics Announces New USB Power Delivery Controller for USB Power in Notebooks
Renesas Electronics Corporation (TSE:6723), a leading global semiconductor and solution provider, introduced the USB Power Delivery (USB PD) specification on June 2, 2014. This new standard enables devices to deliver up to 100W of power via a wired USB connection, with the μPD720250 controller supporting voltages up to 20V at 5A. This advancement marks a significant leap from the previous 7.5W limit, allowing for faster charging and more powerful USB-based solutions.
With the introduction of the μPD720250, designers can now develop more efficient power delivery systems that support high-power devices like laptops while significantly reducing battery charging times for smartphones and tablets. The USB PD specification also allows for standardized AC adapter designs, which simplifies development and lowers costs for manufacturers.
The demand for higher power through USB has been growing rapidly, especially with the rise of mobile computing. In response, the USB 3.0 Promoter Group introduced the USB PD specification in 2012, enabling devices such as laptops to be powered through a single USB connection. Under this protocol, connected devices negotiate power requirements securely, allowing for up to 100W of power transfer—far exceeding the earlier 7.5W limit.
Another key feature of the USB PD specification is its bidirectional power delivery. Unlike traditional USB connections, which only allowed power to flow from the host to the peripheral, USB PD supports power transfer in both directions. This opens up new possibilities, such as using a laptop to power an external display or allowing a display connected to an AC power source to charge a laptop running on battery power.
The μPD720250 USB PD controller offers several important features:
(1) Based on USB PD Specification – The controller fully complies with the USB PD standard, offering flexibility to support any role in a USB connection, whether as a power source or a power consumer.
(2) Comprehensive System Support – The device can be controlled via SMBus, making it easy to integrate into tablets and laptops. It also supports external ROM firmware for system optimization and Renesas plans to provide a full solution suite, including hardware boards and software tools, to aid developers.
(3) Energy Efficiency – Utilizing Renesas’ low-power technology, the μPD720250 reduces energy consumption during both operation and standby, helping meet Energy Star and EuP directives.
(4) Compact Design – The controller includes an integrated 1.0 V regulator that operates from a single 3.3 V supply, resulting in a smaller package size that helps reduce costs and improve system integration.
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RJ45 port editing
1. Origin:
2. The name RJ stands for the registered jack and is the USOC (universal service ordering codes) code of bell system. USOC is a series of registered sockets and their wiring mode, which are developed by bell system to connect the user's equipment to the public network. FCC regulations control the application of this purpose. The FCC (Federal Communications Commission) issued a document on behalf of the U.S. government to specify RJ11.
3. RJ11 is the common name of the connector developed by Western Electric Co. Its shape is defined as a 6-pin connecting device. Originally called wexw, where x means "active", contact or needle. For example, we6w has all six contacts, numbered from 1 to 6. The we4w interface only uses four pins, the outermost two contacts (1 and 6) are not used, and we2w only uses the middle two pins. For RJ11, the information source is contradictory. It can be a 2 or 4-core 6-pin connector. What's more confusing is that RJ11 is not only used to represent the 6-pin connector, it also refers to the 4-pin version.
4. RJ45 and RJ11: different standards, different sizes
5. Due to the different sizes of the two (RJ11 is 4 or 6-pin, RJ45 is an 8-pin connection device), it is obvious that the RJ45 plug cannot be inserted into the RJ11 socket. However, it is physically feasible (RJ11 plug is smaller than RJ45 jack), which makes people think that they should or can work together. It's not. It is strongly recommended not to use RJ11 plug for RJ45 socket.
â’ because RJ11 is not internationally standardized, its size, insertion force, insertion angle, etc. are not in accordance with the international standard connector design requirements, so interoperability cannot be guaranteed. They even cause damage to both. Since the RJ11 plug is smaller than the RJ45 socket, the plastic parts on both sides of the plug will damage the metal pin of the inserted socket.
RJ - 45 port is our most common port, it is our common twisted pair Ethernet port
Because twisted pair is mainly used as transmission medium in Fast Ethernet, RJ-45 port can be divided into 10Base-T network RJ-45 port and 100base TX network RJ-45 port.
Among them, the RJ-45 port of 10Base-T network is usually identified as "eth" in the router, while the RJ-45 port of 100base TX network is usually marked as "10 / 100btx". This is mainly due to the fact that most products of Fast Ethernet router still adopt 10 / 100Mbps bandwidth adaptive.
The left figure shows the RJ-45 port of 10Base-T network, while the right figure shows the RJ-45 port of 10 / 100base-tx network. In fact, the two RJ-45 ports are exactly the same in terms of the port itself, but the corresponding network circuit structure in the ports is different, so they can not be connected casually.
Definition of RJ45 interface pin signal
Ethernet 10 / 100Base-T interface:
1 TX + tranceive data +
2 TX - tranceive data -
3 RX + receive data +
4 N / C not connected
5 N / C not connected
6 RX - receive data
7 n / C not connected
8 N / C not connected
Ethernet 100base-t4 interface:
1 TX_ D1 + tranceive data +
2 TX_ D1 - tranceive data
3 RX_ D2 + receive data +
4 BI_ D3 + bi directional data +
5 BI_ D3 bi directional data
6 RX_ D2 - receive data
7 BI_ D4 + bi directional data +
8 BI_ D4 bi directional data
Note: RJ45 interface adopts differential transmission mode, TX + and TX - are a pair of twisted pair, which can reduce interference when twisted together.
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