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24-channel monitor tailored for automotive switches

Posted: 17 Aug 2009 ?? ?Print Version ?Bookmark and Share

Keywords:automotive? switch-contact monitor? microcontroller?

Maxim Integrated Products has introduced a 24-channel switch-contact monitor for automotive switches. The MAX13362 enables a single microcontroller to monitor up to 24 mechanical switches distributed in the car, eliminating the need for multiple remote MCUs, thus bringing down costs. The MAX13362 protects low-voltage circuitry from high voltages (27V, max) and reverse-battery conditions, making it suitable for monitoring remote mechanical switches exposed to adverse conditions.

The device offers three modes of operationcontinuous, polling and shutdownto optimize power consumption. The MAX13362 is suitable for automotive body controllers and door modules.

An SPI interface provides multiple programming options. Users can configure polling time and polling active time to conserve power between monitoring events. They can also program wetting current, interrupt capability, and switch configuration (i.e., battery connected or ground connected). The programmable wetting current of 0mA to 15mA is applied to any closed switch to clean switch contacts that are exposed to adverse conditions.

The MAX13362 is fully specified over the -40C to +125C automotive temperature range. It is AEC-Q100 automotive qualified, and is available in a 6mm x 6mm, 40-pin TQFN package. Pricing starts at $2.26 (1,000-up, FOB USA). Evaluation kits are available upon request.





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