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table of contents
What is SBC?
SBCstands forSystemBasis Chip,and refers to a simple integrated circuit that integratesCANandLIN transceivers and power ICs such as LDOsandDC/DCconverters.
Advantages of adopting SBC
Modern cars are equipped with various functions to improve safety and comfort, and these functions vary widely.ECU(Electronic Control Unit) and itsECUThe number of installed devices is increasing year by year. According to research by Fuji Chimera Research Institute*, there will be an average of 29.6 ECUs installed per car in 2021, and the number is expected to increase year by year, reaching 46.6 by 2035.
In parallel with this rapid advancement in the functionality of automobiles, from the perspective of environmental issues, low fuel consumption is required for gasoline-powered vehicles, and cruising range becomes important for electric vehicles. The key to this fuel efficiency and electricity consumption is the weight of the car, and each car manufacturerECUThere is a need for lighter weight and smaller size. increases year by yearECUHowever, since the mounting space inside a car is limited, miniaturization is a strong demand for any application.
Therefore, integration contributes to space saving.I CofSBCis. As explained in the previous section,SBCis mainly used for transceivers and power suppliesI Chas been integratedI CTherefore, in applications that incorporate most microcontrollers, parts around the microcontroller can be integrated, reducing the number of parts and saving space. In addition to saving space, conventional transceivers and power supplies with different output voltagesIC etc.By using one part instead of multiple parts, it contributes to reducing man-hours in parts management such as when dealing with delivery problems, and in parts certification required when newly hiring. .
In the next section,InfineonCompany-madeSBCBy introducing and actually minimizing the SBCThis shows how much space you can save.
*Reference: “In-vehicle electrical devices & components comprehensive survey 2022 Volume 2” summarized
Infineon SBC lineup
Infineon has a product lineup that can be roughly divided into four families depending on the required current value, number of transceiver channels, etc.
*OPTIREG™is a general term forInfineon's automotive power supplyICs.
OPTIREG™ Lite SBC
Lite SBCteethSBCCAN is the simplest in the lineup.FDtransceiver, power supplyI CThis is a product that integrates , and a charge pump. The transceiver isCAN FDbutPartial NetworkingSome products are compatible with the power supply for external output.I CteethLDOandDC/DCYou can choose from two types of buck converters. In addition, for supplying power to peripheral components such as microcontrollers, we have a lineup with output voltages of 5V and 3.3V, respectively.
OPTIREG™ DC/DC SBC
DC/DC SBCThe output voltage is 5V or 3.3VDC/DCbuck converter(SMPS)and a separate 5V system.LDO, 1 CANFDA product that integrates a transceiver and up to four LIN transceivers.DC/DC SBCAll family members are exposed pad VQFN-48(7x7mm)package, and is software and pin compatible within the DC/DC SBC family.
OPTIREG™ Mid-Range+ SBC
Mid-Range+ SBCHas multiple power suppliesI C, 1 CANFDwalkie-talkie, and max.2This product integrates several LIN transceivers. front stageLite SBCorDC/DC SBCThe difference is that up to 3 units with 5V or 3.3V output voltageLDOIt is equipped with a 4-channel high-side switch. Mid-Range+ SBCAll family members are exposed pad VQFN-48(7x7mm)The package Mid-Range+ SBC They are software compatible and pin compatible within the SBC family.
OPTIREG™ Multi-CAN Power+ SBC
As the name suggests, the Multi-CAN Power+ SBC uniquely includes four CAN FD transceivers and uses extremely efficient SMPS buck/boost technology to deliver 5V or 3.3V output voltages up to 750mA. . It is primarily suited for automotive applications that require multi-channel CAN transceivers, such as gateways and high-end body control modules.
Technical advantages of Infineon SBC
The above explains the space savings achieved by reducing the number of parts by adopting Infineon's SBC, but SBC also has many technical advantages. Some of the benefits are explained in the next section.
Dark current reduction
Compared to using each product such as a power supply IC and transceiver individually, using an integrated SBC has the advantage of suppressing dark current. However, CAN PN (Partial Networking) function is also included in some family products.
A normal High Speed CAN transceiver wakes up an ECU for any CAN traffic, regardless of whether it is assigned to an ECU, but a CAN PN can be assigned to a specific ECU even among ECUs hanging on the same CAN Bus. The generated wake-up frame allows only specific ECUs to wake up, while other messages are ignored, further reducing system-wide dark current.
Improved reliability
SBCs incorporate extensive diagnostic and protection features and can reduce the number of external components, improving system reliability compared to discrete configurations.
The figure on the right shows the block diagram of the TLE9461 series, which is the simplest family of Lite SBC products whose power IC is LDO, and the block diagram of Mid-Range+ SBC, but Infineon's SBCs use SPI in all families. Since it is a control, the internal watchdog functions such as Timeout Watchdog and Window Watchdog enable more detailed monitoring than normal power supply ICs, improving the reliability of the system.
It also includes State Machine, which includes various functions such as Fail-Safe Outputs/Inputs, Fail-Safe Operating Mode, and Over-/Under-Voltage Monitoring, making it even more reliable. System configuration is possible.
Convenient tool chain
Infineon offers a variety of tools to help lower the hurdles when considering SBC.
Evaluation boards that allow you to immediately check product performance, provision of user manuals and functional safety information necessary for consideration, power consumption simulation tools, and a user-friendly interface allow you to easily configure and quickly evaluate devices. Please take advantage of the information and tools that are useful for development, such as the Config Wizard.
Application example
Infineon's SBC family can be considered for a variety of automotive applications.
The applications listed here are just examples, and we can introduce products that are ideal for other applications, so please feel free to contact us.
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