~The role of semiconductors in building security and Roma’s actions~

In recent years, in the automotive field, with the continuous innovation and rapid development of automatic driving technology, there is an increasing need for functions (functional safety) that can help prevent accidents in emergencies and ISO 26262 and other standards that standardize functional safety. Especially in China with outstanding technological innovation, ISO 26262 (functional safety) has been established as a recommended national standard starting with “GB / T”. The first Chinese translation of ISO 26262 “GB / T 34590” was released in October 2017 and has been implemented since May 2018.

In this context, not only automobile manufacturers (OEMs), but also more and more automobile electronics manufacturers (Tier1) have accelerated functional safety support. From a global perspective, it is the only way to realize functional safety.

Since 2017, Roma has taken the lead in developing LCD panel chipsets composed of LCD drive power IC and supporting functional safety in the industry, and obtained iso26262 Development Process Certification in 2018 to continuously promote the development of products supporting automotive functional safety.

From the perspective of semiconductor manufacturers, under the background of increasing attention to functional safety and ISO 26262 and the need for active response, this paper will introduce you to the summary of the white paper published on the official website of Roma. In addition, the white paper includes specific introductions such as cases. Please log in to the official Roma website for details.

Link to the white paper on ISO 26262:

https://rohmfs-rohm-com-cn.oss-cn-shanghai.aliyuncs.com/cn/products/databook/white_paper/iso26262_wp-c.pdf

Thoughts on functional safety

When introducing “functional safety”, the term often cited is “intrinsic safety”. Here, we hope to introduce “functional safety” by comparing it with “intrinsic safety”. “Intrinsic safety” is a method to ensure safety by eliminating dangerous causes. “Functional safety” is a method to ensure safety by reducing the risk to an acceptable level through functional efforts.

For example, taking road and railway intersections as an example, let’s think about what measures should be taken to avoid collisions between cars and trains.

In order to eliminate the dangerous causes of road and railway intersection, the practice of separating road and railway and building overpass to avoid collision is based on the idea of “intrinsic safety”. According to the idea of “intrinsic safety” and the practice of overpass, the collision between cars and trains can be physically eliminated.

The method of “functional safety” may be to avoid collision by setting railway crossings. Set alarm and railing at the intersection of road and railway, and install sensor on the railway. When the sensor detects that the train is approaching, the alarm sounds and the railing is lowered. When another sensor detects that the train has passed, the alarm stops and raises the baluster. Although roads and railways still physically intersect, the risk of car train collision can be reduced to an acceptable level by setting railway crossings. This is the idea of “functional safety”.

The white paper published on the official Roma website details the specific methods to achieve functional security. Please log in to the official website for details.

The latest vehicle functional safety standard "ISO 26262" supporting vehicle safety

What is ISO 26262

“ISO” means the international organization for standardization, a non-governmental organization headquartered in Geneva, Switzerland, which aims to develop and promote international standards (is). Among them, ISO 9001 (quality management system) and ISO 14001 (environmental management system) are very famous standards.

ISO 26262 is an international standard for “functional safety” related to automotive electrical / electronic systems. As the parent standard of functional safety, IEC 61508 (International Electrotechnical Commission) exists, and ISO 26262 is based on this and modified according to the electrical / electronic system of automobile.

ISO 26262 issued its first edition in November 2011 and its revised second edition in December 2018. In the first edition, the object involved is mass-produced passenger cars below 3500kg; In the second edition, the target range is extended to trucks, buses and two wheeled motor vehicles. The guidelines on semiconductors are newly stipulated in part 11 of the second edition.

Although ISO 26262 is intended to achieve functional safety, it is not a law. Therefore, non-compliance with ISO 26262 is not illegal. However, automobile manufacturers will not buy products that do not meet the standards. Vehicle manufacturers demonstrate that they can ensure vehicle safety by designing electrical / electronic systems according to ISO 26262. Moreover, the design shall ensure that even if electrical / electronic system failure occurs, it will not cause personal injury (including not only drivers and passengers, but also pedestrians, etc.).

The latest vehicle functional safety standard "ISO 26262" supporting vehicle safety

Methods for obtaining ISO 26262 certification

To obtain the above ISO 26262 certification, the usual practice is to accept the review and certification of third-party certification bodies represented by t Ü V Rheinland, t Ü V SUD, SGS t Ü V, dnv-gl, t Ü V Saarland, etc.

Roma started to build the process of ISO 26262 in 2015. About two and a half years later, in March 2018, Roma obtained the Process Certification of ISO 26262 through the German third-party certification agency t Ü V Rheinland. In other words, Roma’s ISO 26262 process has been identified as a process conforming to the ISO 26262 standard. The general practice is to build the process according to the suggestions of foreign aid such as consultants, but Roma has not only organized many seminars to learn and understand the standard, so as to adjust the direction and establish a process in line with the standard.

The white paper published on the official website of Roma records other safety standards, means to comply with iso26262, methods to obtain certification, as well as Roma’s ISO 26262 system. Please log in to the official website for details.

The latest vehicle functional safety standard "ISO 26262" supporting vehicle safety

Examples of automotive applications and semiconductor products supporting functional safety

In recent vehicle applications, how semiconductors contribute to the construction of functional safety, let’s introduce Roma’s actions and solutions.

1. Solution for LCD panel

In the application of LCD panel using instrument panel and electronic mirror, if the timing controller controls two drivers to directly display the image data from GPU on the LCD panel, once the display is abnormal, it will not be able to do any operation, which will directly lead to accidents.

The latest vehicle functional safety standard "ISO 26262" supporting vehicle safety

To solve this problem, Roma’s on-board timing controller can monitor the image data from the GPU, make it display a black screen when the data or input signal is abnormal, or notify the microcontroller to display an error warning screen, so as to make the driver notice the abnormality and successfully solve the problem.

Moreover, Roma’s liquid crystal panel chipset has a timing controller controlling each liquid crystal driver: bu90al210 / bu90al211 / bu90ad410, a source driver and a gate driver driving the liquid crystal panel: ml9882 / ml9873 / ml9872, a multi-functional power supply IC: bm81810muv, and a gamma correction IC for image and video correction: bd81849muv, It can ensure the functional safety of the LCD panel as a whole.

The latest vehicle functional safety standard "ISO 26262" supporting vehicle safety

2. Solutions for ECU power circuit

In Automotive ECU (electronic control unit), multiple power supplies are usually required. Accidents may occur when the power supply is abnormal. Therefore, it is necessary to be able to monitor multiple power supplies in the ECU and deal with accidents according to the abnormalities in case of abnormalities. The power monitoring IC plays this role. The power monitoring IC will monitor these voltages and notify MCU to handle them in case of abnormality.

As mentioned above, in order to achieve “functional safety”, on-board applications need not only the main function, but also the “safety mechanism”, that is, the function of monitoring whether the main function is normal, and handling according to each function in case of abnormality, so as to protect the safety of personnel (including drivers, passengers and pedestrians). In addition, it is also necessary to confirm whether these “security mechanisms” are in the “self diagnosis function” of normal operation.

To solve this problem, Roma has built various monitoring functions and self diagnosis functions into the independent power monitoring IC to realize a power monitoring IC that can easily add functional safety to the existing power supply, and has realized mass production, that is, the power monitoring IC “bd39040muf” that can monitor multiple power supplies. In addition, “bd39042muf” with higher detection accuracy is also under development.

The latest vehicle functional safety standard "ISO 26262" supporting vehicle safety

Only by adding power monitoring IC to the existing system, the power monitoring function required by functional safety can be realized in a very small space. Roma’s Power Monitoring IC is very helpful to simplify the design of functional safety system.

The latest vehicle functional safety standard "ISO 26262" supporting vehicle safety

In the white paper published on the official website of Roma, there are more detailed information on vehicle applications and semiconductor products.

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