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MAX13037, MAX13038
Automotive Contact Monitor and Level Shifters with LDO Regulator

Micropower Automotive Contact Monitor/Level Shifter Features LDO Regulator, WDG, and Reset


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Status
Active: In Production.

Data Sheet
FULL DATA SHEET (PDF, 316kB)
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Description
The MAX13037/MAX13038 automotive contact monitor and level shifters monitor and debounce eight remote mechanical switches and assert an interrupt (active-low INT) if a switch changes state. The state of each switch is sampled through an SPI™ interface by reading the status register. Any switch can be prohibited from asserting an interrupt by writing to the command register. Four of the switch inputs are intended for ground-connected switches (IN0–IN3) and the other four inputs (IN4–IN7) are programmable in groups of two for either ground-connected 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 MAX13037/MAX13038 supply an adjustable wetting current to each closed switch to clean mechanical switch contacts that are exposed to adverse conditions.

The MAX13037/MAX13038 feature a low dropout (LDO) linear regulator capable of supplying up to 150mA of current. The MAX13037 LDO has an output voltage of +5V, whereas the MAX13038 has an output voltage of +3.3V. The MAX13037/MAX13038 also feature a watchdog timer and an open-drain reset output with adjustable timing.

The MAX13037/MAX13038 operate with a +6V to +26V battery voltage applied to BAT. The MAX13037/MAX13038 are available in a 6mm x 6mm, 36-pin TQFN package and operate over the automotive -40°C to +125°C temperature range.

Key Features   Applications/Uses
  • +6V to +26V Operating Voltage Range
  • +42V Compatibility on BAT
  • Switch Inputs Withstand Reverse Battery
  • 150mA LDO, +5V (MAX13037) or +3.3V (MAX13038)
  • Ultra-Low Operating Current 28µA (typ) in 64ms Scan Mode with LDO ON
  • Resistor Adjustable Switching Hysteresis
  • Watchdog and Reset
  • Built-In Switch Debouncing
  • Interrupt Output
  • Immunity to Transients
  • High Modularity
  • Thermal Protection
  • ±8kV HBM ESD Protection on IN0–IN7 Without External Components
  • Two Inputs (IN0, IN1) Programmable as Direct Outputs
  • Four Inputs (IN4–IN7) Programmable for BAT or GND Related Switches

 
  • Body Computers
  • Electric Sunroofs
  • Other Control ECUs
  • Seat Movers
  • Window Lifters

    Diagram
    MAX13037, MAX13038: Typical Operating Circuit
    Typical Operating Circuit

    Design Guides
  • Automotive (PDF)

    Reliability Reports
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    Software/Models
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    Ordering Information
    Notes:

    1. Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
    2. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
    3. Part number suffixes: T or T&R = tape and reel;+ = RoHS/lead-free;# = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions.
    4. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.


    Devices: 1-3 of 3

    MAX13037 Free
    Sample
    Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    Temp RoHS/Lead-Free?
    Materials Analysis
    MAX13037ATX+T    
    Active

    Land Pattern: Not Available

    -40°C to +125°C See data sheet
    MAX13037ATX+  
    Active TQFN;36 pin;37.2 mm²
    Outline Drawing: 21-0141 (PDF)
    Land Pattern: 90-0050 (PDF)
    Use pkgcode/variation: T3666+3*
    -40°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX13038 Free
    Sample
    Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    Temp RoHS/Lead-Free?
    Materials Analysis
    MAX13038ATI+    
    Active

    Land Pattern: Not Available

    -40°C to +125°C See data sheet

    More Information
  • New Product Press Release 2007-12-18 

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    Document Ref.: 19-1084; Rev 0; 2007-11-20
    This page last modified: 2009-09-01


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