Analog Devices MAX22520 Product Info

• 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, V_CC, 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

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 V_CC, 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, V_CC, 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.

Applications

• Industrial Binary Sensors
• Proximity Switches
• Inductive and Magnetic