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LIN slave chip connects switch modules, IO-extensions to LIN network

October 18, 2010 | Christoph Hammerschmidt | 222901144
LIN slave chip connects switch modules, IO-extensions to LIN network Melexis extends its family of smart LIN slave IC's with a new generation of reconfigurable LIN switch slave chips. The MLX80104 is designed to interface with any door, roof, seat, steering wheel, dashboard, HVAC, light control or similar switch module as well as for other application require an easy access via LIN.

The integration of LIN physical layer, voltage regulator and integrated application IO's results in a reduction in component cost. The integration of LIN controller and approved LIN driver make switch modules speak LIN within very short time, the vendor promises.

Incorporating the Melexis LIN transceiver physical layer, Melexis LIN ASSPs (Application Specific Standard Products) guarantee world leading integrated ESD protection results. The LIN protocol handler meets all LIN standards like LIN2.0, LIN2.1 as well as SAE J2602. In close collaboration with car manufacturers Melexis defines the configuration settings of the ASSPs to assure a straightforward fit across different applications and car platforms.

The MLX80104 is a integrated LIN slave one a single Die. All necessary components like physical layer LIN tranceiver, LIN controller, voltage regulator, application controller as well as supporting functions like ADC, PWM generation as well as high voltage capable IOs are integrated. This high integration level should reduce the BOM dramatically and enable the development of small, compact LIN slave modules.

Thanks to the established Melexis dual task microcontroller implementation, an already approved LIN driver can be used and the application can completely decoupled from the LIN network load. For application software a 16-bit RISC microcontroller is integrated.

The MLX80104 draws less than 50uA of current in sleep mode and it is wake up capable via the LIN Bus as well as via connected switches or other wake up sources. The LIN slave supports switches in matrix as well as single switch configuration connected to 18 available IOs. All IOs are high voltage resistant and therefore also remote off module connections can be supported. Via eight interrupt capable IOs rotary encoder are supported. Different analog inputs can convert any analog signal like resistive encoders and resistive switches. An internal battery monitor enables supply voltage dependend functions.

To illuminate the switch module panel, 8 open drain PWM outputs are available with configurable PWM base frequency from 45Hz to 45kHz. With a message from the LIN master the LED output intensity can be adjusted according to OEM specific requirements.

All the above functions are implemented on one piece of silicon in an very small 5x5mm QFN package. This enables together with a minimum of external components LIN slave application on very small PCB space.

Mass production of the MLX80104 has started and samples are available today, Melexis says. For more information visit www.melexis.com










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