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Octal Industrial Digital Input

Small, Robust, and 8-Channel 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)
2.76
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Simplified Block Diagram

Technical Docs

Data Sheet Octal Industrial Digital Input Nov 12, 2021

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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)
2.76

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
    • 0.6mA (typ) Supply Current
    • ±11% Accurate Input-Current Limiters
    • Energyless Field-Side LED Drivers
    • Low Power Dissipation with Negative Input Voltage
  • Fault Tolerant
    • Input Protection to ±40V
    • Integrated Field-Supply Voltage Monitors
    • 5-Bit CRC SPI Error Detection
  • Configurability Enables Wide Range of Applications
    • Configurable Input Current from 0.5mA to 3.4mA
    • Selectable Input Debounce Filtering
    • Current Sources Can Be Disabled
    • Supports Daisy-Chain SPI and Direct SPI
  • Robust Design
    • ±8kV Contact ESD and ±15kV Air-Gap ESD Using Minimum 1kΩ Resistor
    • ±2kV Surge Tolerant Using Minimum 1kΩ Resistor
    • -40°C to +125°C Ambient Operating Temperature
  • Advanced Diagnostics Can Be Provided by MAX22190
    • Pin-to-Pin Compatible
    • Register Compatible

Applications/Uses

  • Building Automation
  • Distributed Control System
  • Motor Control
  • Programmable Logic Controllers

Description

The MAX22199 is an IEC 61131-2 compliant industrial digital input device. The MAX22199 translates eight 24V current-sinking industrial inputs to a serialized SPI-compatible output that interfaces with 3V to 5.5V logic. It can operate as eight Type 1/Type 3 digital inputs or four Type 2 digital inputs. The device provides diagnostic functions, including thermal shutdown, 24V under voltage alarm, 24V missing voltage alarm, and SPI and CRC communication error detection. All of the faults can be configured to generate an interrupt using the active-low FAULT pin.

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

The MAX22199 has a 4-pin SPI interface and, in addition, uses the active-low LATCH input for synchronizing input data sampling across multiple devices.

The MAX22199 field-side accepts a single 7V to 65V supply to the VDD24 pin. When powered by the field supply, the MAX22199 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 MAX22199. Alternatively, the MAX22199 can be powered from a 3.0V to 5.5V logic side supply connected to the VDD pin. For flexibility, the SPI interface operates at 3.3V or 5V logic levels as controlled by the VL pin.

Simplified Block Diagram

MAX22199: Isolated Octal Type 1/3 Digital Input MAX22199: Isolated Octal Type 1/3 Digital Input Zoom icon

Technical Docs

Data Sheet Octal Industrial Digital Input Nov 12, 2021

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 .