MAX22199ATJ+

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 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 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.

Applications

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

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℃ to +125℃ Ambient Operating Temperature
• Advanced Diagnostics Can Be Provided by MAX22190
• Pin-to-Pin Compatible
• Register Compatible