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Micronas unveils 8bit MCU line for LIN bus apps

Posted: 13 Feb 2008 ?? ?Print Version ?Bookmark and Share

Keywords:LIN bus? 8bit MCU? smart sensor?

Micronas has unveiled its easyLIN product line of 8bit MCUs for LIN bus applications.

Today's cars and trucks have multiple LIN bus modules connecting smart sensors and controlling smart actuators used in power windows, wipers and many other functions. The HVC 22xyA and HVC 24xyA simplify the design and reduce the cost of LIN bus modules by combining all logic functions, peripheral modules, interfaces and a LIN bus interface in a single device.

"easyLIN is highly flexible," says Peter Zimmermann, market manager for automotive at Micronas. "Even low-end and mid-price cars have many electronic functions controlled by the LIN bus. The easyLIN architecture makes one device easily adaptable to all these applications. It can be used in virtually every application where networking capability is a must, like doors, seats, mirrorseven in power train applications. We wanted to make it easy for our customers to design cost-effective LIN bus modules, and easyLIN's high level of integration accomplishes that."

easyLIN family devices integrate 5V and 2.5V regulators, true EEPROM, watchdogs and power-driver electronics. The included internal voltage regulators operate directly from an automobile's 12V supply and withstand load dumps of up to 40V, a requirement in vehicle applications. easyLIN also contains a switchable 5V supply output, which can be used to power external subsystems.

Complementing the high-voltage-tolerant regulators, the easyLIN family can directly drive up to eight 12V loads, such as lamps and relays. Relay driver protection is also embedded. The on-chip transistors resist moderate loads, and can drive external power transistors for large loads. These drivers include three fast-shutdown modules for power MOSFET transistor protection that respond virtually on the instant, without CPU involvement. Working with on-chip pulse-width modulators (PWM), easyLIN can also drive brushed and brushless DC motors.

Combining all these features with a sophisticated 8051-type 8bit CPU core and a full range of peripherals, the easyLIN family is typically the only component needed for a LIN bus slave application.

The easyLIN is a complete digital subsystem: It has a full LIN 2.0 PHY interface, a fast 10bit queued ADC, three multithreshold comparators, an op-amp and multiple interrupt inputs. It is available in flash and ROM versions, both types include true EEPROM.

eaysLIN's on-chip oscillator features Micronas Low Emission Automotive Processor (LEAP) technology, which actively suppresses EMI using precisely-timed clock phase offsets.

Other integrated peripherals include two 8bit and two 16bit timers, an SPI interface, a 16bit PWM and three enhanced 12bit PWMs. In addition, the easyLIN contains its own supervisory circuit. An on-chip temperature sensor against an overheat condition, and a supply monitor resets the device if the power supply goes out of range, even momentarily.

This high level of integration means that many designs require only the easyLIN device. Cost and area are dramatically reduced with easyLIN integrationin many cases reducing the component count by 15 to 20 devices.

All easyLIN family devices operate from -40C to 125C, necessary in the harsh environment of automotive electronics. The family offers a range of power-saving modes, with current consumption as low as 20?A while still preserving RAM data.

The device is offered in a PSOIC28 package. Pricing varies with the exact model, but ranges from $2.32 to $3.19 for low quantities.

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