Embedded Systems LIN slave mop-up chip meets ISO26262

Embedded Systems LIN slave mop-up chip meets ISO26262

2013/08/16

AMS had introduced a LIN companion chip for MCUs that complies with the automotive ISO26262 functional safety standard, claiming it to be the first.

“ISO26262 compliance has added a new layer of complexity and difficulty to the task of designing many automotive systems,” said AMS general manager Bernd Gessner.

The 8pin AS8530 includes a LIN 2.1 transceiver, a 50mA LDO for a local MCU, a reset generator, an output voltage monitor, and a unique chip ID.

“As a differentiator, the AS8530 offers a series of system management functions through a shared pin serial interface, all within the same SOIC8 package,” said the firm. The addition of diagnosis functions provides built-in support for the requirements of ISO26262.”

It also has a two-wire serial port (sharing the Enable and TX pins) that allows status registers and diagnosis information to be read by the local microcontroller.

And there is a window watchdog, and back-up registers to store data when the microcontroller shuts down.

“These features are crucial in the design of ISO26262-compliant systems, which must be able to cease operation safely when in a fault condition, before the vehicle is at risk of endangering passengers or other road users,” said AMS. “The AS8530 is suitable for any LIN-networked sensor and actuator slaves, including those found in door modules, sunroofs and headlight positioning units. It is suited to safety-critical systems that require an ASIL grading under the provisions of ISO26262.”

The LDO is factory set to 3.3V or 5V.

Normal, power-saving, stand-by and sleep modes can be triggered through the Enable pin.

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