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Octal Industrial Digital Input with Diagnostics

Industry's Smallest, Robust, Octal Digital Input

Product Details

The MAX22190 is an IEC 61131-2 compliant industrial digital input device. The MAX22190 translates eight, 24V current-sinking, industrial inputs to a serialized SPI-compatible output that interfaces with 3V to 5.5V logic. A current setting resistor allows the MAX22190 to be configured for Type 1, Type 2, or Type 3 inputs. Field wiring is verified for proximity switches, by a second threshold detector on each input. When wire-break is enabled, the active-low FAULT output is asserted and a register flag is set if the input current drops below the wire-break threshold for more than 20ms. Additional diagnostics that assert the active-ow FAULT pin include: overtemperature, low 24V field supply, 24V field supply missing, CRC communication error, etc.

For robust operation in industrial environments, each input includes a programmable glitch filter. The filter delay on each channel can be independently programmed to one of eight values between 50μs and 20ms, or filter bypass.

The MAX22190 has a 4-pin SPI interface and in addition uses the active-low LATCH input for synchronizing input data across multiple devices in parallel.

MAX22190 field-side accepts a single 7V to 65V supply to VDD24 pin. When powered by the field supply, MAX22190 generates a 3.3V output from an integrated LDO regulator, which can provide up to 25mA of current for external loads in addition to powering the MAX22190. Alternatively, MAX22190 can be powered from a 3.0V to 5.5V logic side supply connected to VDD pin. For flexibility, the SPI interface operates at 3.3V or 5V logic levels as controlled by the VL pin.

Design Solution: Industrial Digital Inputs: They’re Not Quite as Simple as Counting from 0 to 1 ›

Key Features

  • High Integration Reduces BOM Count and Board Space
    • Eight Input Channels with Serializer
    • Operates Directly from Field Supply (7V to 65V)
    • Compatible with 3.3V or 5V Logic
    • 5mm x 5mm TQFN Package
  • Reduced Power and Heat Dissipation
    • Accurate Input-Current Limiters
    • Energyless Field-Side LED Drivers
  • Fault Tolerant with Built-In Diagnostics
    • Input Protection to ±40V with Low-Input Leakage Current
    • Wire Break Detection
    • Integrated Field-Supply Voltage Monitors
    • Integrated Overtemperature Monitors
    • 5-Bit CRC Code Generation and Transmission for Error Detection
  • Configurability Enables Wide Range of Applications
    • Configurable IEC 61131-2 Type 1, 2, 3 Inputs
    • Configurable Input Current-Limiting from 0.5mA to 3.4mA
    • Selectable Input Debounce Filtering
  • Robust Design
    • ±8kV Contact ESD and ±15kV Air Gap ESD Using Minimum 1kΩ Resistor
    • ±1kV Surge Tolerant Using Minimum 1kΩ Resistor
    • -40°C to +125°C Ambient Operating Temperature

Applications/Uses

  • Building Automation
  • Industrial Automation
  • Process Automation
  • Programmable Logic Controllers
Parametric specs for Digital I/O
Digital Input/Output Digital Input
Interface Type SPI
# Channels 8
VSUPPLY (V) (min) 7
VSUPPLY (V) (max) 65
ISUPPLY (µA) (typ) 0.6
Digital Input Type Type 1
Type 2
Type 3
Min. Detectable Field Input Pulse Width (µs) 3
Oper. Temp. (°C) -40 to +125
Package/Pins TQFN-CU/32
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Simplified Block Diagram

MAX22190: Functional/Block Diagram MAX22190: Functional/Block Diagram Zoom icon

Design & Development

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Description

The MAX22190 evaluation system (EV system) provides the hardware and software necessary to evaluate the MAX22190 Octal Industrial Digital Input device with Diagnostic features. The MAX22190 EV kit has Pmod™ compatible connector for SPI communication. The EV system includes the USB2PMB2# adapter board that receives commands from a PC through the USB port to create an SPI interface for communication between the software and the MAX22190 on the EV kit.

The EV system includes a graphical user interface (GUI) that provides communication between the target device and the PC. The MAX22190 EV kit has two MAX22190 devices (U1 and U2) that can operate in multiple modes, as shown in Figure 1:

  1. Single-Channel Mode: The USB2PMB2# adapter connects to either U1 or U2 on the EV kit, depending on which channel is preferred, and selected using the on-board jumpers.

  2. Independent Slave Mode: The USB2PMB2# adapter uses two chip-select signals (active-low CS1 and active-low CS2) to control each chip through a single connector/GUI interface.

  3. Daisy-Chain Mode: The USB2PMB2# adapter connects to both U1 and U2 through the MAX14483 Digital Isolator, and SDO from U1 connects to SDI of U2. Both U1 and U2 are controlled from a single SPI interface.

View Details

Features

  • Easy Evaluation of the MAX22190
  • EV Kit Logic Side is USB-Powered
  • Configured for IEC 61131-2 Type 1, 3 and Type 2
  • Independent Slave or Daisy-Chainable SPI Interface
  • Galvanic Isolation using MAX14483 and MAX12931
  • Robust Design ±2kV Surge Tolerant Line-to-Line
  • Windows® 10, Windows 8.1, Windows 7, and Windows XP® Compatible Software
  • Fully Assembled and Tested
  • Proven PCB Layout
  • RoHS Compliant

Description

The MAX22190 evaluation system (EV system) provides the hardware and software necessary to evaluate the MAX22190 Octal Industrial Digital Input device with Diagnostic features. The MAX22190 EV kit has Pmod™ compatible connector for SPI communication. The EV system includes the USB2PMB2# adapter board that receives commands from a PC through the USB port to create an SPI interface for communication between the software and the MAX22190 on the EV kit.

The EV system includes a graphical user interface (GUI) that provides communication between the target device and the PC. The MAX22190 EV kit has two MAX22190 devices (U1 and U2) that can operate in multiple modes, as shown in Figure 1:

  1. Single-Channel Mode: The USB2PMB2# adapter connects to either U1 or U2 on the EV kit, depending on which channel is preferred, and selected using the on-board jumpers.

  2. Independent Slave Mode: The USB2PMB2# adapter uses two chip-select signals (active-low CS1 and active-low CS2) to control each chip through a single connector/GUI interface.

  3. Daisy-Chain Mode: The USB2PMB2# adapter connects to both U1 and U2 through the MAX14483 Digital Isolator, and SDO from U1 connects to SDI of U2. Both U1 and U2 are controlled from a single SPI interface.

View Details

Features

  • Easy Evaluation of the MAX22190
  • EV Kit Logic Side is USB-Powered
  • Configured for IEC 61131-2 Type 1, 3 and Type 2
  • Independent Slave or Daisy-Chainable SPI Interface
  • Galvanic Isolation using MAX14483 and MAX12931
  • Robust Design ±2kV Surge Tolerant Line-to-Line
  • Windows® 10, Windows 8.1, Windows 7, and Windows XP® Compatible Software
  • Fully Assembled and Tested
  • Proven PCB Layout
  • RoHS Compliant

Description

The MAX22190 peripheral module provides the hardware to evaluate the MAX22190 Octal Industrial Digital Input. Refer to the MAX22190 IC data sheet for detailed information regarding operation of the IC. The module takes advantage of the features in the MAX22190 allowing it to be powered from a single low voltage logic supply (3.0-5.5V) without the need for a 24V field supply. Note that this module provides a subset of the MAX22190 features – for greater flexibility refer to the MAX22190 EV kit. The module can be used in various ways; the device is configured by SPI interface. Maxim sells low-cost USB2PMB1#, USB2PMB2#, and USB2GPIO# adapter boards that use the Munich GUI software for communication through a USB cable generating SPI communication with the MAX22190. 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 45mm long x 20mm wide, with the width determined by the size of the X1 and X2 connectors.

View Details

Features

  • Easy Evaluation of the MAX22190
  • Powered from Single 3.0-5.5V Logic Supply, Without the Need for 24V Field Supply
  • Configured for IEC 61131-2 Type 1 and Type 3 Sensor Inputs
  • Proven PCB Layout
  • Works with USB2PMB2# or USB2GPIO# Adapter and Munich GUI Software

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SIMULATION MODELS

MAX22190 IBIS Model

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Support & Training

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Parameters

Parametric specs for Digital I/O
Digital Input/Output Digital Input
Interface Type SPI
# Channels 8
VSUPPLY (V) (min) 7
VSUPPLY (V) (max) 65
ISUPPLY (µA) (typ) 0.6
Digital Input Type Type 1
Type 2
Type 3
Min. Detectable Field Input Pulse Width (µs) 3
Oper. Temp. (°C) -40 to +125
Package/Pins TQFN-CU/32

Key Features

  • High Integration Reduces BOM Count and Board Space
    • Eight Input Channels with Serializer
    • Operates Directly from Field Supply (7V to 65V)
    • Compatible with 3.3V or 5V Logic
    • 5mm x 5mm TQFN Package
  • Reduced Power and Heat Dissipation
    • Accurate Input-Current Limiters
    • Energyless Field-Side LED Drivers
  • Fault Tolerant with Built-In Diagnostics
    • Input Protection to ±40V with Low-Input Leakage Current
    • Wire Break Detection
    • Integrated Field-Supply Voltage Monitors
    • Integrated Overtemperature Monitors
    • 5-Bit CRC Code Generation and Transmission for Error Detection
  • Configurability Enables Wide Range of Applications
    • Configurable IEC 61131-2 Type 1, 2, 3 Inputs
    • Configurable Input Current-Limiting from 0.5mA to 3.4mA
    • Selectable Input Debounce Filtering
  • Robust Design
    • ±8kV Contact ESD and ±15kV Air Gap ESD Using Minimum 1kΩ Resistor
    • ±1kV Surge Tolerant Using Minimum 1kΩ Resistor
    • -40°C to +125°C Ambient Operating Temperature

Applications/Uses

  • Building Automation
  • Industrial Automation
  • Process Automation
  • Programmable Logic Controllers

Description

The MAX22190 is an IEC 61131-2 compliant industrial digital input device. The MAX22190 translates eight, 24V current-sinking, industrial inputs to a serialized SPI-compatible output that interfaces with 3V to 5.5V logic. A current setting resistor allows the MAX22190 to be configured for Type 1, Type 2, or Type 3 inputs. Field wiring is verified for proximity switches, by a second threshold detector on each input. When wire-break is enabled, the active-low FAULT output is asserted and a register flag is set if the input current drops below the wire-break threshold for more than 20ms. Additional diagnostics that assert the active-ow FAULT pin include: overtemperature, low 24V field supply, 24V field supply missing, CRC communication error, etc.

For robust operation in industrial environments, each input includes a programmable glitch filter. The filter delay on each channel can be independently programmed to one of eight values between 50μs and 20ms, or filter bypass.

The MAX22190 has a 4-pin SPI interface and in addition uses the active-low LATCH input for synchronizing input data across multiple devices in parallel.

MAX22190 field-side accepts a single 7V to 65V supply to VDD24 pin. When powered by the field supply, MAX22190 generates a 3.3V output from an integrated LDO regulator, which can provide up to 25mA of current for external loads in addition to powering the MAX22190. Alternatively, MAX22190 can be powered from a 3.0V to 5.5V logic side supply connected to VDD pin. For flexibility, the SPI interface operates at 3.3V or 5V logic levels as controlled by the VL pin.

Design Solution: Industrial Digital Inputs: They’re Not Quite as Simple as Counting from 0 to 1 ›

Simplified Block Diagram

MAX22190: Functional/Block Diagram MAX22190: Functional/Block Diagram Zoom icon

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal