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ST's CAN chip supports partial networking

Posted: 14 Oct 2011     Print Version  Bookmark and Share

Keywords:automotive IC  CAN  LIN  transceiver 

STMicroelectronics launches automotive power management ICs supporting advanced partial networking technology targeted at enhancing fuel efficiency and improving emissions.

 L99PM72PXP IC

The chip is said to help car makers respond to changing new-car legislation in major markets worldwide, aiming to save fuel and reduce emissions. In Europe, Euro 6 regulations will replace Euro 5 in 2014, and the average CO2 emissions limit will fall to 95g/km by 2020. Chinese 4 standards, similar to Euro 4, came into force in China in 2011 and the city of Beijing is planning to adopt Chinese 5. In the USA, Corporate Average Fuel Economy (CAFE) requirements for passenger cars will increase from 10.76 – 13.38kpl (30.4 to 37.8mpg) by 2016 and 17.91kpl (50.6mpg) by 2025.

To meet these increasingly stringent regulations to improve fuel efficiency, one way is to reduce the energy consumed by systems such as door electronics and climate controls. ST's L99PM72PXP IC achieves this by allowing modules to be turned off individually when not being used, taking advantage of "partial networking." This is a new feature in the latest CAN specification, ISO 11898-6, and is said to reduce an average vehicle's CO2 emission by more than 2g/km.

The L99PM72PXP integrates both High-Speed CAN (HS-CAN) and LIN physical layers to provide all the functions needed to build up a complete Electronic Control Unit (ECU) for car body applications. Its features are tailored to particular uses such as in climate control modules and door control units, as well as seat modules, trunk and trailer modules, sunroof and rear-view modules.

Unlike standard CAN transceivers or system-basis chips currently on the market, the L99PM72PXP is able to monitor the CAN bus autonomously, without the module's main processor being active. It activates the module only when a correctly addressed wake-up signal is detected. By allowing parts of the CAN network to be deactivated in this way, the L99PM72PXP contributes to reduce overall electrical energy consumption.

Advanced fail-safe functionality is an additional, and unique, feature of the L99PM72PXP, which improves the sustainability and reliability of automotive electronic control units. Built-in features such as supervision of the microcontroller, supply voltages and temperatures provide protection against causes of failure. In addition, cost-efficient peripheral functions such as high-side and low-side gate drivers, operational amplifiers and voltage regulators reduce the number of external components and lower overall system costs.

The L99PM72PXP is housed in a PowerSSO-36 package and is scheduled for volume production in Q3 2012, priced at Rs.132.29 ($2.95) for orders up to 1000 units. Alternative pricing options may be available for larger order quantities.





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