Xiaomi's self-developed chip is branded, and the official hammer is coming.

Huawei has Kirin chip with superior performance and excellent power consumption, which is independently developed;

Vivo has a V 1 image chip, which serves the professional image computing system.

The upcoming OPPO FIND X5 will bring its first self-developed NPU chip-Mariana Marisilicon X;

As for Xiaomi, in order to realize 120W single battery technology on mobile phones, a P 1 charging chip was independently developed.

This was originally something that Xiaomi was proud of, but recently it "had an accident".

Not long ago, a user in Weibo tweeted that the surging P 1 was accompanied by a smiling expression. Below the information is the screen printing comparison between the surging P 1 chip and Nanxin semiconductor chip. As can be seen from the figure, they are almost identical.

Officially, Xiaomi's P 1 chip is designed by Xiaomi and manufactured by Nanxin Semiconductor (internal code SC856 1). The chip adopts ultra-high voltage 4: 1 charging architecture, and realizes the charging of 120W single battery.

The conversion modes of 1: 1, 2: 1 and 4: 1 are supported, all modes can be conducted in two directions, and various charging functions such as wired 120W, wireless 50W and wireless reverse charging can be realized.

The P 1 chip developed by Xiaomi is completely different from Nanxin SC857 1 in topology. It is two charging chips with different designs, different functions and different positioning.

To put it simply, P 1 is independently developed and designed by Xiaomi, and Nanxin is responsible for OEM. This is just like Apple's A 15 is made by TSMC, and Qualcomm Snapdragon's 8 Gen 1 chip is made by Samsung, which is a truth.

Secondly, unlike the SOC of mobile phone, the charging chip needs to integrate communication baseband, GPU graphics processor, ISP image processor, NPU neural network processor and so on. And it's not that difficult.

As a technology company with a market value close to HK$ 400 billion (it broke HK$ 400 billion before but fell again), it is no problem for Xiaomi to make a charging chip, even if it is spent.

Therefore, regarding the self-developed chip, Xiaomi doesn't need to lift a rock and lick his own feet, leaving himself with unnecessary trust crisis and handle.

Let's talk about charging the chip. In fact, 120W is not surprising at present, nor is it unique to Xiaomi.

In September, 20265438, Nanxin Semiconductor, which cooperated with Xiaomi, launched the chip code-named SC857 1. The chip adopts the ultra-high voltage 4: 2 charging architecture, and can also realize the charging of 120W dual batteries.

However, this 2855438+0 chip of Xiaomi is still better. The charging technology of "120W single battery" was realized for the first time in the industry. In the past, we used double batteries in series.

Xiaomi said that in the past, in a single fast charging system, five series-parallel circuits with different charge pumps were needed to convert the 20V voltage input into the mobile phone into 5V voltage that can be charged into the battery.

A large number of charge pumps and full-range architectures will bring a lot of heat, so it is impossible to run at full power for a long time in practical use, let alone realize high-power fast charging of 120W.

The core of driving Xiaomi 120W surge secondary battery is two self-developed smart charging chips of Xiaomi: surge P 1. They take over the complex structure of the traditional 5-charge pump, and convert the high-voltage electric energy input to the mobile phone into a large current that can directly charge the battery.

As the first resonant charging chip in the industry, 2855438+0 has an ultra-efficient architecture with an adaptive switching frequency of 4: 1. The resonant topology efficiency is 97.5%, the non-resonant topology efficiency is 96.8%, and the heat loss decreases linearly by 30%.

2855438+0 itself undertakes a lot of conversion work: the traditional charge pump only needs two working modes (voltage transformation and straight-through), while 2855438+0: 1, 2: 1 and 4: 1 conversion modes, and all modes need to support bidirectional conduction.

This means that the whole * * * needs the arrangement and combination of 15 mode switching controls-7 times that of the traditional charge pump.

Forward 1: 1 mode makes bright screen charging more efficient, forward 2: 1 mode is compatible with more chargers, forward 4: 1 mode can support 120W surge second charging, and backward1:2//kloc-0.

澎湃 P 1 is also the 4: 1 charging chip with the highest charging efficiency in Xiaomi, which can reach 0.83W /mm? Ultra-high power density, LDMOS has also reached the industry-leading ultra-low1.18mΩ mm? RSP .

However, the 2855438+0 chip needs three kinds of flying capacitors with different withstand voltages, each capacitor needs an independent open-circuit and short-circuit protection circuit, and the pre-charge voltage needs to be strictly controlled in each working mode, and the number of power tubes is nearly twice that of the traditional charge pump.

And because of the improvement of topology design and functional complexity, each chip of P 1 needs to pass more than 2,500 tests at the factory, which is much higher than the traditional charge pump.

Although a lot of technical terms are said, users only need to understand that its main advantages are these:

澎湃 P 1 charging chip realizes wired 120W and wireless 50W charging rates, and also supports 10W wireless charging.

In addition, it is a single cell. Compared with double batteries, the space utilization rate is higher, and the battery capacity is larger under the same volume, which can be further reduced by controlling the thickness and temperature of the fuselage.

Therefore, as a domestic millet, the research and development strength is very worthy of recognition. At this point, "Xiaomi 澎 P 1 chip was bought" is self-defeating.

After the incident, the blogger who published the article has also deleted Weibo, and netizens have also expressed their support for Xiaomi and the strength of domestic independent research and development.

I believe that most netizens who blindly follow the trend just follow the trend, but there is a good saying-rumors stop at the wise, and blindly following the trend will only show their ignorance.

Therefore, in the face of such a thing, we must treat it rationally, don't believe in rumors, and don't make rumors. Because no one who has principles and a bottom line will make trouble. Followers are the last straw to crush the victims.

Once a thing reaches ten, it will reach hundreds. Netizens will change from the role of the people who eat melons to the chess pieces in the hands of profit-seekers.

However, after the unconfirmed and shady touch-up, the original truth and essence will be submerged by deep cover-up. In the end, the protagonist of the incident became the biggest victim and suffered irreversible damage and loss.

A while ago, Liu Xue's online suicide was enough to give us a wake-up call.

Although Xiaomi is a technology company, it is not a single individual.

But it is absolutely not advisable for individuals, groups or companies to spread rumors, because they deserve respect.

Images and data sources:

[1] IT House: Net transmission Xiaomi 澎 P 1 The chip is not self-developed, and Nanxin Semiconductor responded that the news is not true.

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