EVALUATION KIT AVAILABLE MAX31910 Ultra-Low Power Industrial, Octal, Digital Input Translator/Serializer General Description Benefits and Features The MAX31910 industrial interface serializer translates, Ultra-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, automation to 5V CMOS-compatible signals required Adjustable from 0.5mA to 6mA by microcontrollers. It provides the front-end interface Special (Patent-Pending) Ultra-Low-Power Mode circuit of a programmable logic controller (PLC) digital with Switched Current Limiters input module. High Integration Reduces BOM Count, Board Size, and System Cost The device features integrated current limiting, lowpass 8 High-Voltage Input Channels (36V max) filtering, and channel serialization. Input current limit- On-Chip 8-1 Serialization with SPI Interface ing allows a significant reduction in power consumed On-Chip 5V Regulator from the field voltage supply as compared to traditional On-Chip Overtemperature Indicator discrete resistor-divider implementations. In addition, to On-Chip Field Supply Voltage Monitor achieve the lowest in-class power dissipation, the device Integrated Debounce Filters, Selectable from 0 to 3ms uses patent-pending circuit techniques to achieve further reduction of power beyond what is possible by input Robust Features and Performance for Industrial current limiting alone. Environments Multibit CRC Code Generation and Transmission for Selectable on-chip lowpass filters allow flexible debouncing Error Detection and More Reliable Data Transmission and filtering of sensor outputs based on the application. High ESD Immunity on All Field Input Pins On-chip serialization allows a drastic reduction in the Accepts Industry Standard Input Types number of optocouplers used for isolation. The device Configurable for IEC 61131-2 Input Types 1, 2, and 3 serializer is stackable so that any number of input channels can be serialized and output through only one SPI- Flexible Power Supply Capability Enables Usage compatible port. This reduces the number of optocouplers in 5V, 12V, 24V, and Higher Voltage Systems needed to only three, regardless of the number of input Wide Operating Field Supply Range of 7V to 36V channels. Can Be Powered From the Logic-Side Using a 5V Supply For enhanced robustness with respect to high-frequency noise and fast electrical transients, a multibit CRC code Applications is generated and transmitted through the SPI port for Digital Input Modules for PLCs each 8 bits of data. The on-chip 5V voltage regulator can Industrial, Building, and Process Automation be used to power external optocouplers, digital isolators, Motor Control or other external 5V circuitry. For low-cost applications, Maxim Integrated offers a pin-compatible version of this device, the MAX31911. The MAX31911 does not include the patent-pending current clamp-switching circuitry that is included with the MAX31910. The MAX31912 and MAX31913 versions includes energy- less LED drivers while maintaining pin compatibility. Ordering Information appears at end of data sheet. 19-6440 Rev 6 8/17MAX31910 Ultra-Low Power Industrial, Octal, Digital Input Translator/Serializer Block Diagram 24V 5V 5VOUT V CC24V 5V REGULATOR MAX31910 VREF SUPPLY MONITOR OR FAULTB TEMP MONITOR DB0 DB1 RIREF SWITCHED CRC GEN. RT1 CURRENT LIMITER IN1 CONTROLLER LP SENSORS OR SIN 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