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MAX31911 Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX31911 Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 15 page MAX31911 Industrial, Octal, Digital Input Translator/Serializer General Description The MAX31911 industrial interface serializer translates, conditions, and serializes the 24V digital output of sen- sors and switches used in industrial, process, and build- ing automation to 5V CMOS-compatible signals required by microcontrollers. It provides the front-end interface cir- cuit of a programmable logic controller (PLC) digital input module. The device features integrated current limiting, lowpass filtering, and channel serialization. Input current limiting allows a significant reduction in power consumed from the field voltage supply as compared to traditional discrete resistor-divider implementations. Selectable on- chip lowpass filters allow flexible debouncing and filter- ing of sensor outputs based on the application. On-chip serialization allows a drastic reduction in the number of optocouplers used for isolation. The device serializer is stackable so that any number of input channels can be serialized and output through only one SPI-compatible port. This reduces the number of optocouplers needed to only three, regardless of the number of input channels. For enhanced robustness with respect to high-frequency noise and fast electrical transients, a multibit CRC code is generated and transmitted through the SPI port for each 8 bits of data. The on-chip 5V voltage regulator can be used to power external optocouplers, digital isolators, or other external 5V circuitry. For ultra-low-power applications, Maxim Integrated offers a pin-compatible version of this device, the MAX31910. The MAX31910 uses patent-pending circuit techniques to achieve further reduction of power beyond what is pos- sible by input current limiting alone. The future generation version of the MAX31910 and MAX31911 will include energy-less LED drivers while maintaining pin compatibility. Features S Eight High-Voltage Input Channels (36V max) S Configurable for IEC 61131-2 Input Types 1, 2, 3 S Wide Operating Supply Range of 7V to 36V S Optional Configuration Allows 5V Supply S Selectable Input Filtering and Debouncing from 0ms to 3ms S Configurable Input Current Limiting from 0.5mA to 6mA S High HBM ESD Immunity on All Field Input Pins S On-Chip 8-to-1 Serialization with SPI Interface S On-Chip 5V Regulator S Overtemperature Indicator S On-Chip 24V Field Supply Voltage Monitor S Low Quiescent Current and Power Dissipation S Multibit CRC Code Generation and Transmission for Error Detection and More Reliable Data Transmission to an External Micro Applications Digital Input Modules for PLCs Industrial, Building, and Process Automation Motor Control Block Diagram 19-6441; Rev 1; 9/12 Ordering Information appears at end of data sheet. For related parts and recommended products to use with this part, refer to www.maximintegrated.com/MAX31911.related. EVALUATION KIT AVAILABLE SOUT CS MODESEL SIN DB1 DB0 FAULTB 5VOUT VCC24V RIREF GND RT0 IN0 RT7 IN7 VREF INPUT CHANNEL 0 VREF SENSORS 24V OR CRC GEN. µCONTROLLER OR ISOLATION 5V 5V REGULATOR INPUT CHANNEL 7 SUPPLY MONITOR TEMP MONITOR CURRENT LIMITER LP FILTER CLK VOLTAGE COMPARATOR SERIALIZER MAX31911 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com. |
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