One-Time Programmable (OTP) Industrial Sensor Output Driver

200mA OTP Output Driver Simplifies Post Production Configuration and Calibration

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The MAX22520 24V line driver for industrial sensors incorporates a one-time programmable (OTP) analog interface for signal conditioning of binary switching sensors. Sensor calibration and configuration settings can be permanently programmed with the inline data interface using one-time programming (OTP). Additionally, an accurate integrated linear regulator provides a programmable (3.3V or 5V) low-noise supply for analog signal sensing circuitry.

The driver output (DO) is configurable using the Maxim® 1-Wire® protocol and an OTP interface to permanently operate in a normally-open or normally-closed state and in a high-side (PNP), low-side (NPN), or push-pull configuration. The maximum driver load current can be programmed to 100mA (min) or 200mA (min).

Configuration and OTP programming are done using VCC, DO, and GND. This use of the standard three-wire interface pins simplifies programming at the end-of-line, when the sensor is already in its final housing.

The MAX22520 also features a programmable comparator, PWM oscillator, and digital potentiometer. These integrated functions further support sensor calibration for analog sensing circuitry. Additionally, an on-board LED driver provides visual feedback of the logic state of the sensor DO output.

Robust protection enables the MAX22520 to function in harsh industrial environments. DO, VCC, and GND are all protected against hot-plug events, ±1kV/500Ω surge events, reverse-polarity, short circuits, and ESD strikes.

The MAX22520 operates from a wide 4.75V/8V to 36V supply and is available in a 20-bump wafer-level package (WLP) (2mm x 2.5mm, 0.5mm pitch). The device operates over the -40°C to +105°C temperature range.

MAX22520: Simplified Block Diagram MAX22520: Simplified Block Diagram Enlarge+

Key Features

  • High Configurability Supports a Wide Range of Sensor Designs
    • Programmable Driver Configuration: High-Side (PNP), Low-Side (NPN), or Push-Pull
    • Programmable Driver Current Limit: 100mA (min), 200mA (min)
    • Programmable Linear Regulator Voltage: 3.3V (typ), 5V (typ)
    • Input Comparator with Programmable Thresholds
    • Digital Potentiometer with Programmable 6-bit Tap
    • PWM Oscillator with Programmable Duty Cycles
    • 4.75V/8V (min) to +36V Supply Voltage
    • Integrated LED Driver for Visual Feedback
  • Robust Design for Harsh Industrial Environments
    • Reverse Polarity Protection on DO, VCC, and GND
    • Short Circuit Protection on DO
    • Thermal Shutdown Protection
    • ±6kV IEC 61000-4-2 Air-Gap ESD Protection
    • ±6kV IEC 61000-4-2 Contact Discharge ESD Protection
    • ±1kV/500Ω IEC 61000-4-5 Surge Protection
    • -40°C to +105°C Operating Temperature Range
    • 1µF Capacitive Load Drive Capability
    • Fast Demagnetization of Inductive Loads
  • Small Form Factor for Compact Designs
    • Ultra-Small (2mm x 2.5mm) 20-bump WLP


  • Industrial Binary Sensors
  • Proximity Switches
  • Inductive and Magnetic Sensors

MAX22520EVKIT: Evaluation Kit for the MAX22520

Technical Documents

User Guide 6454 IO-Link Handbook
Request Reliability Report for: MAX22520 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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Type ID Title
User Guide 6454 IO-Link Handbook