EVALUATION KIT AVAILABLE MAX31953/MAX31963 Octal Industrial Digital Input with Isolated SPI Interface General Description Benefits and Features The MAX31953/MAX31963 translates eight current-sinking, Reduced Power and Heat Dissipation 12V, 24V, or 48V industrial inputs to a galvanically isolated, Accurate Input-Current Limiters SPI-compatible, serial output that interfaces with 3V to 5.5V Energyless Field-Side LED Drivers logic. The galvanic isolation is certified to 500V for 60 RMS Integrated Buck Regulator (MAX31963) seconds, with creepage and clearance distances of 1.4 mm. Configurability Enables Wide Range of Standard and The input side (field-side) of the device includes a 5V logic Custom Applications serial input for daisy-chaining data from other devices (such Eight High-Voltage Input Channels (36V Max) as the MAX31911/MAX31913) through the devices isolated Configurable IEC 61131-2 Type 1, 2, 3 Inputs serial port, eliminating the need for additional isolators. The Configurable Input Current-Limiting From 0.5mA to field-side of the devices requires a single 4.5V to 5.5V 6mA supply. This power is supplied either directly or through the Selectable 0, 25s, 0.75ms, or 3ms Input integrated voltage regulator. The MAX31953 includes a Debounce Filtering linear voltage regulator, while the MAX31963 includes an High-Speed, 2s Update Rate efficient buck regulator that requires an external inductor. Both regulators accept input voltages from 7V to 36V. The High Integration Reduces BOM Count and Board logic-side of the devices operate from a single 3V to 5.5V Space supply, which also sets the SPI logic level. Integrated 500V Galvanic Isolation RMS Integrated 5V LDO (MAX31953) Applications Daisy-Chain Capability Eliminates Isolators Programmable Logic Controllers 48-Pin TSSOP Package Industrial Automation Integrated Overtemperature Monitor and Thermal Process Automation Shutdown Building Automation Integrated Field-Supply Voltage Monitors 5-Bit CRC Code Generation and Transmission For Standard Compliance (Pending) Error Detection UL1577 15kV ESD HBM Immunity on IN1IN8 -40C to +125C Ambient Operating Temperature Operates Directly From Field Supply in 12V and 24V Ordering Information appears at end of data sheet. Systems Integrated Voltage Regulator Accepts 7V to 36V Option to Power Directly From a 5V Supply SPI Interface Flexibility Compatible with 3.3V or 5V Logic Daisy-Chain Data From the Field-Side 19-7684 Rev 0 7/15MAX31953/MAX31963 Octal Industrial Digital Input with Isolated SPI Interface Typical Application Circuit 2.2k IN1 LED1 GNDL 2.2k IN2 LED2 3.0 TO 5.5V VDDL INF 0.1F 1F (INPUT-FIELD) INP (INPUT-PIN) 2.2k IN8 VDD 1nF LED8 DOUT MISO MAX31953 CLK CLK MAX31963 15k IREF CS GPO GNDF C, ASIC, BACKPLANE MODESEL OR FPGA INTERFACE FAULT GPI OR INT DB0L GPO 150 VDD24F DB1L GPO MAX31963 ONLY 10F GND LX 68H VDD5F 0.1F 10F DB0F DB1F DINF CLKO CSO FIELD- LOGIC- SIDE SIDE DB0 DB1 SOUT CLK CS 5VOUT 15k RIREF GND VDD24VF 2.2k IN1 16-CHANNEL TYPE 1OR3 ISOLATION MAX31913 DIGITALINPUTMODULE BARRIER RT1 2.2k IN2 RT2 2.2k IN8 RT8 MODSEL SIN Maxim Integrated 2 www.maximintegrated.com