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Scalable MCU drives airbag, power-steering car safety apps

Posted: 26 Jul 2007 ?? ?Print Version ?Bookmark and Share

Keywords:MCU? vehicle safety applications? flash memory? Flexray?

XC2300

Infineon Technologies has delivered a new MCU family designed for use in vehicle safety applications, specifically targeted at airbag systems and electronic power-steering applications. The XC2300 MCU family provides 32bit performance and a rich peripheral feature set for safety applications requiring fast reaction time, redundancy and flexibility.

Automotive safety systems incorporating XC2300 products have the potential to be certified according to the new SIL3 (Safety Integrity Level) standard (IEC 61508), said the company. This standard for safety systems is presently being discussed by the automotive industry and is about to take a hold in Europe in 2008.

Powerful MCUs
The XC2300 family is designed to enable scalability, HW/SW reuse and compatibility across automotive electronics safety systems. The product family features a high-performance CPU that can process up to 80MIPS at 80MHz.

The flexible Universal Serial Interface Channel (USIC) of the XC2300 family can be configured as UART, LIN, buffered SPI (Serial Peripheral Interface), IIC bus or IIS interface. Moreover, the MultiCAN (CAN Rev. 2.0B active) provides up to 64 flexibly assignable message objects on up to three CAN nodes and gateway functionalities.

Two parallel ADCs lead to high performance with up to 24-channels, optional data pre-processing and a conversion time down to 1.2?s. The ADCs have specific safety features for detecting broken connections and synchronizing the two ADCs to redundantly sample incoming signals.

The Memory Protection Unit (MPU) offers an additional benefit to the developers of safety systems by allowing the integration of software from third party suppliers (like AUTOSAR) into a protected execution environment. The different software components can be fully encapsulated by providing memory and time protection features so that safety and non-safety critical applications can be executed coherently within "trusted" and "untrusted" execution domains. In this case, the MPU controls the encapsulation of the different software tasks and provides a reliable mechanism for avoiding any interferences. Significant savings can be made in the software development process if most tasks can be classed as "untrusted" and only safety-critical tasks are required to be engineered at a higher "trusted" level.

The low power consumption of the XC2300 products (less than 60mA at maximum performance of 80MHz) reduces system costs since only tiny voltage regulators are needed.

The members of the XC2300 family will feature between 128Kbytes and 1.6Mbytes of flash memory to fit both airbag systems and highly complex safety-systems such as power steering, low-end chassis control and sensor clusters.

Further characteristics include AUTOSAR compliance with Infineon supporting software standardization for interfaces and software modules for automotive systems by providing AUTOSAR software drivers for all XC2300 products.

Scalable devices
The broad XC2300 product portfolio is planned to comprise over 50 products, offering safety application design engineers the scalability to select an MCU with the optimal combination of specifications, during and after the design cycle, without any changes to PCB design. Once the software is compiled for Infineon's XC2300 MCUs, it can easily be used for safety applications within different model platforms of an automaker. Overall cost savings in development, qualification, validation and testing of HW/SW can be up to 30 percent, said Infineon.

All components of the XC2300 family include a set of safety relevant features such as ECC on all memories, memory protection, feature redundancy and several control mechanisms including CRC. These features are essential for all XC2300 products to support and enable a system meeting the requirements of IEC 61508 (SIL3).

Today, Infineon introduces the first two XC2300 family members, the XC2365 and the XC2387, with a total of 16 software-compatible and pin-compatible products. Family members vary according to flash memory size (384-, 448- and 576Kbytes), number of ADC channels (16 or 24), frequency (66- or 80MHz), temperature range (-40C to 85C or -40C to 125C) and green (Pb-free) LQFP package options (LQFP-100 / -144).

Further versions with flash memory sizes from 128Kbytes to 1.6Mbytes and additional features such as FlexRay interfaces and further LQFP-packages with 64 and 176 pins will be introduced in 2008.

Samples of the XC2365 and XC2387 of the XC2300 family are available for dedicated automotive customers. Sample pricing varies according to product specification. The XC2300 family is supported by the full suite of development tools, including evaluation boards, debuggers, compilers and documentation.




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