Automotive Contact Monitor And Level Shifter Integrated Products

The MAX13036 automotive contact monitor and level shifter monitors and debounces eight remote mechanical switches and asserts an interrupt (INT) if a Switch changes state. The state of each Switch is sampled through an SPI Interface by reading the status Register and any Switch CAN be prohibited from asserting an inter- rupt by writing to the command Register Four of the Switch inputs are intended for ground-connected switch- es (IN0IN3), and the other four inputs (IN4IN7), are programmable in groups of two for either ground-con- nected or battery-connected switches. Two Switch inputs (IN0, IN1) have direct level-shifted outputs (DO0, DO1) to be used for PWM or other timing-based signals. Switch input thresholds are set to 50% of the voltage applied to BATREF. The threshold hysteresis is set by connecting an external resistor from HYST to ground. The MAX13036 supplies an adjustable wetting current to each closed Switch to clean mechanical Switch contacts that are exposed to adverse conditions. The MAX13036 operates with a +6V to +26V battery volt- age applied to BAT. A separate +2.7V to +5.5V Logic sup- ply input (VL) sets the Interface voltage. The MAX13036 is available in a 5mm x 5mm 28-pin TQFN package and operates over the -40C to +125C temperature range. By Maxim Integrated Products