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Octal Industrial Digital Input with Diagnostics

Industry's Smallest, Robust, Octal Digital Input

Product Details

Key Features

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
Budgetary
Price (See Notes)
3.57
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Simplified Block Diagram

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Sampling:
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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
Budgetary
Price (See Notes)
3.57

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 .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.