EVALUATION KIT AVAILABLE
MAX31913
Industrial, Octal, Digital Input
Translator/Serializer
General Description
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
The MAX31913 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 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.
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 Very Low Quiescent Current and Power/Heat
Dissipation
S Multibit CRC Code Generation and
Transmission for Error Detection and More
Reliable Data Transmission to an External Micro
S Field-Side Energyless LED Drivers
Applications
Digital Input Modules for PLCs
Industrial, Building, and Process Automation
Motor Control
For ultra-low-power applications, and for the lowest
possible heat dissipation. Maxim Integrated plans to offer
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.
Block Diagram
24V
5V
5VOUT
V
5V REGULATOR
CC24V
MAX31913
VREF
SUPPLY
MONITOR
FAULTB
TEMP
MONITOR
DB0
DB1
RIREF
RT0
CRC GEN.
CURRENT
LIMITER
IN0
µCONTROLLER
LP
SENSORS
SIN
OR
ISOLATION
FILTER
MODESEL
CLK
VOLTAGE
COMPARATOR
VREF
Ordering Information appears at end of data sheet.
SERIALIZER
CS
INPUT CHANNEL 0
INPUT CHANNEL 7
RT7
IN7
SOUT
GND
For related parts and recommended products to use with this part, refer to www.maximintegrated.com/MAX31913.related.
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.
19-6641; Rev 0; 3/13
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