MAX31911 Translator/Serializer Datasheet

MAX31911 Datasheet PDF, Equivalent


Part Number

MAX31911

Description

Digital Input Translator/Serializer

Manufacture

Maxim Integrated

Total Page 17 Pages
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MAX31911
MAX31911
EVALUATION KIT AVAILABLE
Industrial, Octal, Digital Input Translator/Serializer
General Description
The MAX31911 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 filtering 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 possible
by input current limiting alone.
The MAX31912 and MAX31913 versions include energy-less
LED drivers while maintaining pin compatibility.
Benefits and Features
● Very Low Power and Heat Dissipation
• Low Quiescent Current (1.4mA typ)
• Highly Accurate and Stable Input Current Limiters,
Adjustable from 0.5mA to 6mA
● High Integration Reduces BOM Count, Board Size,
and System Cost
• Eight High-Voltage Input Channels (36V max)
• On-Chip 8-1 Serialization with SPI Interface
• On-Chip 5V Regulator
• On-Chip Overtemperature Indicator
• 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
Ordering Information appears at end of data sheet.
19-6441; Rev 6; 4/15

MAX31911
MAX31911
Industrial, Octal, Digital Input Translator/Serializer
Block Diagram
24V
VCC24V
SENSORS
RIREF
RT1
IN1
RT8
IN8
GND
5V REGULATOR
SUPPLY
MONITOR
VREF
TEMP
MONITOR
MAX31911
OR
CURRENT
LIMITER
VOLTAGE
VREF COMPARATOR
LP
FILTER
INPUT CHANNEL 0
CRC GEN.
SERIALIZER
5VOUT
5V
FAULTB
DB0
DB1
SIN
MODESEL
CLK
CS
µCONTROLLER
OR
ISOLATION
INPUT CHANNEL 7
SOUT
www.maximintegrated.com
Maxim Integrated 2


Features MAX31911 EVALUATION KIT AVAILABLE Indus trial, Octal, Digital Input Translator/ Serializer General Description The MAX 31911 industrial interface serializer t ranslates, conditions, and serializes t he 24V digital output of sensors and sw itches used in industrial, process, and building automation to 5V CMOS-compati ble signals required by microcontroller s. It provides the front-end interface circuit of a programmable logic control ler (PLC) digital input module. The dev ice features integrated current limitin g, lowpass filtering, and channel seria lization. Input current limiting allows a significant reduction in power consu med from the field voltage supply as co mpared to traditional discrete resistor -divider implementations. Selectable on -chip lowpass filters allow flexible de bouncing and filtering of sensor output s based on the application. On-chip ser ialization allows a drastic reduction i n the number of optocouplers used for i solation. The device serializer is stackable so that any number.
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