PDF MAX31913 Data sheet ( Hoja de datos )

Número de pieza	MAX31913
Descripción	Digital Input Translator/Serializer
Fabricantes	Maxim Integrated
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No Preview Available ! MAX31913 Industrial, Octal, Digital Input Translator/Serializer General Description The MAX31913 industrial interface serializer translates, conditions, and serializes the 24V digital output of sensors and switches used in industrial, process, and building automation to 5V CMOS-compatible signals required by microcontrollers. It provides the front-end interface circuit 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 optocou- plers 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 isola- tors, or other external 5V circuitry. Field-side LED drivers recycle the current from the eight inputs to provide visual input status indication without any additional current or power consumption. For ultra-low-power applications, and for the lowest possible heat dissipation, Maxim Integrated offers a pin-compatible version of this device, the MAX31912. The MAX31912 uses patent-pending circuit techniques to achieve further reduction of power beyond what is possible by input current limiting alone. Contact the factory for availability. Ordering Information appears at end of data sheet. Benefits and Features ●● Very Low Power and Heat Dissipation • Low Quiescent Current (1.6mA typ) • Highly Accurate and Stable Input Current Limiters, Adjustable from 0.5mA to 6mA • Energy-Less Field-Side LED Drivers ●● High Integration Reduces BOM Count, Board Size, and System Cost • 8 High-Voltage Input Channels (36V max) • On-Chip 8-1 Serialization with SPI Interface • On-Chip 5V Regulator • On-Chip Overtemperature Indicator • Dual On-Chip Field Supply Voltage Monitor • Integrated Debounce Filters, Selectable From 0 to 3ms ●● Robust Features and Performance for Industrial Environments • Multibit CRC Code Generation and Transmission for Error Detection and More Reliable Data Transmission • High ESD Immunity on All Field Input Pins ●● Accepts Industry Standard Input Types • Configurable for IEC 61131-2 Input Types 1, 2, and 3 ●● Flexible Power Supply Capability Enables Usage in 5V, 12V, 24V, and Higher Voltage Systems • Wide Operating Field Supply Range of 7V to 36V • Can Be Powered From the Logic-Side Using a 5V Supply Applications • Digital Input Modules for PLCs • Industrial, Building, and Process Automation • Motor Control 19-6641; Rev 3; 4/15 1 page MAX31913 Industrial, Octal, Digital Input Translator/Serializer AC Electrical Characteristics (VCC24V = 7V to 36V, TJ = -40NC to +150NC, unless otherwise noted.) (Note 2) PARAMETER Field Input Pulse Width ESD SYMBOL tPW CONDITIONS No external capacitors on pins IN1-IN8 HBM, all pins HBM, IN1-IN8 with respect to GND MIN TYP MAX UNITS 1 µs ±2 kV ±15 AC Electrical Characteristics: SPI Interface (VCC24V = 7V to 36V, TJ = -40NC to +150NC, unless otherwise noted.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS CLK Pulse Duration CS Pulse Duration SIN to CLK Setup Time SIN to CLK Hold Time CS to CLK Setup Time CS to CLK Recovery Time Clock Pulse Frequency Propagation Delay, CLK to SOUT Propagation Delay, CS to SOUT Rise/Fall Time SOUT/FAULT tCLKPW tCSPW tSU1 tH1 tSU2 tREC fCLK tP1 tP2 tR/F (Note 7) (Note 8) (Note 9) (Note 9) (Note 10) (Note 10) (Notes 7, 11) (Note 7) (Note 8) (Note 7) 20 ns 20 ns 5 ns 8 ns 8 ns 12 ns 25 MHz 20 ns 20 ns 40 ns Note 2: Limits are 100% production tested at TA = +25°C and/or TA = +125°C. Limits over the operating temperature range and relevant supply voltage range are guaranteed by design and characterization. Typical values are not guaranteed. Note 3: If a 24V supply is not available, the device can be powered through V5VOUT. In this mode of operation, the VCC24V supply must be left unconnected. All other specifications remain identical. The field-supply UV1 and UV2 alarms will be activated (set to 1), indicating the absence of the 24V supply in this mode of operation. Note 4: When using suggested external 2.2kω series resistors, limits of -3V to +36V apply. Note 5: fIN refers to the maximum pulse frequency (1/fIN = shortest pulse width) that can be detected from the field sensors and switches. Note 6: External resistor RREF can be adjusted to set any desired current limit between 0.5mA and 6mA. Note 7: See Figure 8. Note 8: See Figure 5. Note 9: See Figure 7. Note 10: See Figure 6. Note 11: This is the maximum bit transfer rate through the serializer interface. www.maximintegrated.com Maxim Integrated │ 5 5 Page MAX31913 Industrial, Octal, Digital Input Translator/Serializer Applications Information EMC Standards Compliance The external components shown in Figure 1 allow the device to operate in harsh industrial environments. Components were chosen to assist in suppression of voltage burst and surge transients, allowing the system to meet or exceed international EMC require- Table 2. Recommended Components ments. Table 2 lists an example device for each com- ponent in Figure 1. The system shown in Figure 1, using the components shown in Table 2, is designed to be robust against IEC fast transient burst, surge, RFI specifications, and ESD specifications (IEC 61000-4-4, -5, -6, and -2). COMPONENT DESCRIPTION REQUIRED/RECOMMENDED/OPTIONAL C0 4.7nF, 2kV polypropylene capacitor Recommended C1 10FF, 60V ceramic capacitor C3 100nF, 10V ceramic capacitor Required Recommended C4 4.7µF, 10V low ESR ceramic capacitor Required C5 100nF, 100V ceramic capacitor Recommended D0 36V fast zener diode (ZSMB36) Recommended D1 General-purpose rectifier (IN4007) Optional: For reverse-polarity protection. LED1– LED8 LEDs for visual input status indication Optional R1 150I, 1/3W MELF resistor Required RINX 2.2kI, 1/4W MELF resistor Required RREF 15kI, 1/8W resistor Required Note: For higher EFT performance, a minimum 1nF, 1000V capacitor can be added from nodes fIN1–fIN8 to Earth or Ground. For additional methods to improve EFT robustness, please check the Maxim website regularly for upcoming application notes currently being developed. 24V R1 C0 EARTH D0 D1 C1 C5 fIN1–8 RINX LED 1–8* VCC24V 5VOUT DB0 DB1 MODESEL SIN MAX31913 IN1–8 CLK CS RT1–8 RIREF SOUT FAULT GND JUMPERS TO 5VOUT AND GND C3 C4 ISOLATION VDD_LOGIC CLK CS SOUT FAULT RREF GROUND 0V C0 EARTH *IF LEDS ARE NOT USED, USER MUST GROUND THE RT PINS. Figure 1. Typical EMC Protection Circuitry www.maximintegrated.com Maxim Integrated │ 11 11 Page

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