MAX22191

PRODUCTION

Ultra-Low-Power, Parasitically Powered Digital Input

Industry's Smallest, Robust, Digital Input

Data Sheet (Rev. 1) Product Selection Table
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Overview

  • High Integration for Flexible Circuit Designs
    • Interfaces to Optocouplers or Digital Isolators
    • Capable of Driving an Optocoupler and Status LED
    • Operational as Sink or Source Digital Input
    • Ultra-High Speed: 250ns (max) Propagation Delay
    • Test Pulse Diagnostic
    • Allows for Small Footprint TVS Surge Protection
  • Reduced Power and Heat Dissipation
    • Parasitically Powered from the Field Input
    • Accurate ±15% Input-Current Limiting
    • 100µA (typ) Quiescent Current with Optocoupler
    • 96% (typ) Current-Transfer Efficiency to Optocoupler
  • Robust Design
    • Operates from -60V to +60V Input Voltage
    • -40°C to +125°C Ambient Operating Temperature

The MAX22191 is an IEC 61131-2 compliant, industrial digital input (DI) device. The MAX22191 translates a 24V industrial switching signal to a 3.3V/5V CMOS-level output, or to a 2.3mA (typ) current output for driving an optocoupler and/or LED. Voltage thresholds and current levels in the MAX22191 are compliant with Type 1 and Type 3 inputs, while minimizing power dissipation. The MAX22191 is also compliant with 48V inputs, with the addition of external resistors.

Operating power is derived from the input signal, eliminating the need for an external field-side power supply. A 250ns (max) fast response time is ideal for high-speed inputs. Additionally, a CMOS-compatible test input is available for safety diagnostics.

The MAX22191 features robust functionality for harsh industrial systems and is capable of normal operation with input signals ranging from -60V to +60V. Integrated thermal shutdown further protects the device when VCC is present.

The MAX22191 is available in a small, 6-lead SOT23 package and operates over the -40°C to +125°C ambient temperature range.

Design Solution: Worried About Heat in Your I/O Module? No Need to Sweat ›

Applications

  • Current Sourcing Inputs
  • Individually Isolated Inputs
  • Industrial Automation
  • Motor Controls
  • Process Automation
MAX22191
Ultra-Low-Power, Parasitically Powered Digital Input
MAX22191: Simplified Block Diagram
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Documentation

Data Sheet 1

Reliability Data 1

Design Note 2

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Tools & Simulations

Software Development 2

IBIS Model 1

Evaluation Kits

eval board
schematic 1
MAX22191PMB

Evaluation Kit for the MAX22191 Peripheral Module

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Features and Benefits

  • Easy Evaluation of the MAX22191
  • Isolated, Paristically Powered and Logic-Powered Circuits for Easy Evaluation
  • Proven PCB Layout
  • Works with USB2PMB2# or USB2GPIO# Adapter and Munich GUI Software

Product Details

The MAX22191PMB# peripheral module provides the hardware to evaluate the MAX22191 parasitically powered digital input. Refer to the MAX22191 IC data sheet for detailed information regarding operation of the IC. The PMB features two circuits: one for isolated parasitically powered circuit (using an optoisolator) and one for a 24V input signal with the circuit powered from a low-voltage logic supply.

The module can be used in various ways. Maxim sells low-cost USB2PMB1#, USB2PMB2#, and USB2GPIO# adapter boards that use the Munich GUI software for communication through a USB cable. This is not included with this board. Alternatively, any microcontroller or FPGA with a 12-pin Pmod™-compatible connector can be used. Another option for the user is to wire-wrap a temporary connection from their system to the pins on connector X1. For these later two options the user needs to write their own control software.

The Pmod PCB dimension is just 42mm long x 20mm wide, with the width determined by the size of the X1 connector.

Applications

  • Current Sourcing Inputs
  • Individually Isolated Inputs
  • Industrial Automation
  • Motor Controls
  • Process Automation

MAX22191EVKIT

Evaluation Kit for the MAX22191

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Features and Benefits

  • 24V and 48V Circuits for Easy Evaluation
  • Proven PCB Layout
  • Fully Assembled and Tested

Product Details

The MAX22191 evaluation kit (EV kit) is a fully assembled and tested circuit board that demonstrates the functionality of the MAX22191 digital input in an optical isolator circuit. The EV kit features two circuits: one for a 24V digital input signal and one for a 48V input signal.

Applications

  • Building Automation
  • Industrial Automation
  • Process Automation
  • Programmable Logic Controllers
MAX22191PMB
Evaluation Kit for the MAX22191 Peripheral Module
MAX22191PMB Photo
MAX22191EVKIT
Evaluation Kit for the MAX22191

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