Electronics Technology


Contact monitor ideal for automotive applications

25 July 2007 Electronics Technology

The MAX13036 from Maxim is an automotive contact monitor and level shifter which monitors and debounces eight remote mechanical switches while consuming a meagre 17 μA supply current. The low supply current is a result of innovative ultra-low-current design techniques, as well as the use of programmable polling periods. This low current consumption, combined with a wide input-voltage range (±45 V), high ±8 kV ESD protection on switch inputs and adjustable wetting current, make the MAX13036 ideal for applications within harsh automotive environments, such as body computers, window lifters, electric sunroofs, and other electronic control units (ECUs).

To further minimise the overall current consumption of the ECU, the MAX13036 features an open-drain interrupt output that is active in the absence of a logic supply and can be used to wake up an external microcontroller from a sleep state. Each switch can be individually programmed to generate an interrupt through the device's SPI-compatible interface.

All eight switch inputs feature programmable wetting current and switching hysteresis. Four inputs are for ground-connected switches, and the remaining four inputs can be programmed in groups of two as battery-connected or ground-connected switches. In addition, two switch inputs can be configured to be direct level-shifting outputs for use with PWM or other timing-related inputs. The modularity of this device allows multiple MAX13036s to be cascaded, in order to monitor additional switches.

The MAX13036 operates from a 6 V to 26 V battery voltage and withstands 42 V load-dump; a separate 2,7 V to 5,5 V logic-supply input sets the interface voltage. Available in an RoHS-compliant, lead-free, 5 mm x 5 mm, 28-pin TQFN package, this device is fully specified over the -40°C to +125°C automotive temperature range. An evaluation kit is available to speed designs.



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