Analog Devices Inc./Maxim Integrated MAX13036ATI+T

Overview

MAX13036ATI+T from Maxim Integrated is an 8-channel contact monitor and level shifter IC for remote mechanical switch monitoring in automotive and industrial control ECUs. It features SPI interface, programmable wetting current (7.5–40 mA), adjustable hysteresis (via external resistor), and two direct level-shifted outputs (DO0/DO1) for PWM-capable timing signals. Operates from +6V to +26V battery supply with -40°C to +125°C temperature range.

For engineers reviewing the MAX13036ATI+T datasheet, MAX13036ATI+T pinout, MAX13036ATI+T application, or MAX13036ATI+T equivalent, key selection considerations include its dual-mode switch input configuration (GND- or BAT-connected), ultra-low 17μA scan-mode current, ±8kV HBM ESD protection on all inputs, thermal warning output (OT), and interrupt-driven state change detection across eight channels.

Technical Context

The MAX13036ATI+T implements a configurable SPI slave interface (5 MHz max CLK) with 16-bit status and command registers, enabling real-time switch state readback and per-input interrupt masking (P0–P7), debounce time setting (via 500pF–10nF capacitor on TDEB), and group-level switch topology selection (M0/M1 bits for IN4–IN7). Its analog front-end uses internal 16kΩ sense resistors and BATREF-referenced 50% threshold detection with externally adjustable hysteresis (0–0.48 × VBATREF).

It supports three operational modes: normal (full sensing), scan (periodic polling at 2–14 ms intervals), and shutdown (2–4 μA quiescent). Wetting current is programmable via WET pin (30kΩ–330kΩ resistor), active post-debounce, with 20ms pulse duration when WTOFF = 0. Thermal protection triggers OT assertion at +170°C (typ) with +15°C hysteresis and disables wetting current above threshold.

Key Specifications

Pinout & Package

The MAX13036ATI+T is housed in a 5mm × 5mm, 28-pin TQFN-EP package with exposed pad connected to GND for thermal performance. Pin functions are validated per Maxim's official pin description table (Rev 1, Feb 2015).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar contact monitoring and level shifting applications.

Compared with MAX13035ATI+, the MAX13036ATI+T adds critical timing-signal capability via DO0/DO1; versus TPIC2810PWR, it trades ADC functionality for lower power, wetting current, and robust hysteresis tuning - making it optimal for cost-sensitive, high-reliability mechanical switch monitoring in automotive and industrial ECUs.

Availability

MAX13036ATI+T is available at Aetrix Electronics and suitable for automotive body control modules, industrial machine safety panels, commercial vehicle telematics units, and off-highway equipment control ECUs requiring stable component supply across extended temperature and voltage ranges.

Supply support for MAX13036ATI+T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power management ICs for automotive, industrial, and communications applications.

The MAX13036ATI+T belongs to Maxim's contact monitoring and level-shifting product line, engineered specifically for reliable, low-power, high-voltage switch interface in harsh-environment electronic control units.

FAQ

What is the primary function of the MAX13036ATI+T in an automotive ECU?

The MAX13036ATI+T serves as an 8-channel contact monitor and level shifter that detects mechanical switch closures (e.g., door locks, ignition keys), debounces inputs, provides interrupt signaling, and delivers level-shifted outputs (DO0/DO1) for timing-critical signals. In automotive ECUs, it replaces discrete debounce circuits and external wetting current sources while supporting +6V to +26V battery operation and -40°C to +125°C operation.

How does the MAX13036ATI+T handle switch debouncing, and can it be adjusted?

The MAX13036ATI+T implements a shared, capacitor-programmable debounce timer. A capacitor (500pF–10nF) connected from TDEB to GND sets the debounce time between 3.18ms and 188ms. The device rejects glitches shorter than 20μs automatically. Debounce operates in both normal and scan modes, with behavior adapted to each - e.g., in scan mode, a state change forces entry into normal mode to complete debouncing before returning to low-power polling.

Can the MAX13036ATI+T monitor both ground-connected and battery-connected switches on the same device?

Yes. The MAX13036ATI+T natively supports both topologies: IN0–IN3 are fixed for ground-connected switches, while IN4–IN7 are programmable in two groups (IN4/IN5 and IN6/IN7) via M0/M1 bits in the command register to operate as either ground- or battery-connected. This flexibility allows a single MAX13036ATI+T to interface with diverse switch types in one ECU without redesigning the PCB layout.

What is the role of the WET pin on the MAX13036ATI+T, and how is wetting current configured?

The WET pin on the MAX13036ATI+T accepts an external resistor (30kΩ–330kΩ) to ground to set wetting current from 7.5mA to 40mA (typ). This current cleans oxidation from mechanical switch contacts during closure. Wetting is enabled per-switch via WEN/WEND bits and activated post-debounce. With WTOFF = 0, it pulses for 20ms; with WTOFF = 1, it remains active while the switch is closed - configurable per application cleanliness requirements.

Does the MAX13036ATI+T provide thermal protection, and how is it signaled?

Yes. The MAX13036ATI+T includes thermal protection that asserts the OT (overtemperature) output low when junction temperature exceeds +170°C (typ), with +15°C hysteresis. At this point, wetting current is automatically disabled to reduce power dissipation. OT is an open-drain output requiring an external pull-up and can also be monitored via bit 7 of the SPI-read status register - enabling software-based thermal management alongside hardware alerting.