Analog Devices Inc. MAX22520 Industrial Sensor Output Driver
Analog Devices Inc. MAX22520 Industrial Sensor Output Driver is optimized for use with 3-wire sensors operating in harsh industrial environments. Integrated analog interface I/Os are included to support sensor signal generation and signal conditioning for sensing circuitry. The MAX22520 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 OTP. Additionally, an accurate integrated linear regulator provides a programmable (3.3V or 5.0V) low-noise supply for analog signal sensing circuitry.
The MAX22520's Driver Output (DO) is configurable using the ADI 1-Wire® protocol and an OTP interface to permanently operate in a normally open or normally closed state and in high-side (PNP), low-side (NPN), or push-pull configurations. The maximum driver load current can be programmed to 100mA or 200mA (minimum).
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-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 onboard LED driver provides visual feedback on the logic state of the sensor DO output.
The MAX22520 operates from a wide 4.75V/8.0V to 36V supply and is offered in a 20-bump Wafer-Level Package (WLP).
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: 3V (typ), 5V (typ)
- Input comparator with programmable thresholds
- Digital potentiometer with programmable 6-bit tap
- PWM oscillator with programmable duty cycles
- 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
Applications
- Industrial binary sensors
- Proximity switches
- Inductive and magnetic sensors
Block Diagram
Typical Application Circuit
Additional Resource
Development Tools
Analog Devices Inc. MAX22520 Evaluation Kit
Demonstration and development platform for the MAX22520 Industrial Sensor Output Driver.