EVALUATION KIT AVAILABLE MAX31911 Industrial, Octal, Digital Input Translator/Serializer General Description Benefits and Features The MAX31911 industrial interface serializer translates, Very Low Power and Heat Dissipation conditions, and serializes the 24V digital output of sensors Low Quiescent Current (1.4mA typ) and switches used in industrial, process, and building Highly Accurate and Stable Input Current Limiters, Adjustable from 0.5mA to 6mA automation to 5V CMOS-compatible signals required by microcontrollers. It provides the front-end interface High Integration Reduces BOM Count, Board Size, circuit of a programmable logic controller (PLC) digital and System Cost input module. Eight High-Voltage Input Channels (36V max) On-Chip 8-1 Serialization with SPI Interface The device features integrated current limiting, low-pass On-Chip 5V Regulator filtering, and channel serialization. Input current limiting On-Chip Overtemperature Indicator allows a significant reduction in power consumed from On-Chip Field Supply Voltage Monitor the field voltage supply as compared to traditional discrete Integrated Debounce Filters, Selectable from 0 to 3ms resistor-divider implementations. Selectable on-chip lowpass filters allow flexible debouncing and filtering of sensor Robust Features and Performance for Industrial Environments outputs based on the application. Multibit CRC Code Generation and Transmission On-chip serialization allows a drastic reduction in the for Error Detection and More Reliable Data number of optocouplers used for isolation. The device Transmission serializer is stackable so that any number of input channels High ESD Immunity on All Field Input Pins can be serialized and output through only one SPI- Accepts Industry Standard Input Types compatible port. This reduces the number of optocouplers Configurable for IEC 61131-2 Input Types 1, 2, and 3 needed to only three, regardless of the number of input channels. Flexible Power Supply Capability Enables Usage in 5V, 12V, 24V, and Higher Voltage Systems For enhanced robustness with respect to high-frequency Wide Operating Field Supply Range of 7V to 36V noise and fast electrical transients, a multibit CRC code Can Be Powered from the Logic-Side Using a 5V is generated and transmitted through the SPI port for Supply each 8 bits of data. The on-chip 5V voltage regulator can be used to power external optocouplers, digital isolators, Applications or other external 5V circuitry. Digital Input Modules for PLCs For ultra-low-power applications, Maxim Integrated offers Industrial, Building, and Process Automation a pin-compatible version of this device, the MAX31910. Motor Control The MAX31910 uses patent-pending circuit techniques to achieve further reduction of power beyond what is possible by input current limiting alone. The MAX31912 and MAX31913 versions include energy-less LED drivers while maintaining pin compatibility. Ordering Information appears at end of data sheet. 19-6441 Rev 7 8/17MAX31911 Industrial, Octal, Digital Input Translator/Serializer Block Diagram 24V 5V 5VOUT V CC24V 5V REGULATOR MAX31911 VREF SUPPLY MONITOR OR FAULTB TEMP MONITOR DB0 DB1 RIREF CRC GEN. CURRENT RT1 LIMITER IN1 CONTROLLER LP SENSORS SIN OR FILTER ISOLATION MODESEL VOLTAGE COMPARATOR VREF CLK SERIALIZER CS INPUT CHANNEL 0 RT8 SOUT INPUT CHANNEL 7 IN8 GND Maxim Integrated 2 www.maximintegrated.com