TIDA-010049

TUV-assessed digital input reference design for IEC 61508 (SIL-2)

TIDA-010049

Design files

Overview

This 8-channel, group-isolated, digital input module reference design, focuses on applications with the need for industrial functional safety. This design has diagnostics implemented to help detect both permanent and transient random hardware faults. The concept of this input module has been assessed by TUEV SUED (TÜV SÜD) and helps designers meet system compliances of IEC61508-2:2010 (SIL2) and EN13849-1:2015 (Cat2 PLd). Additionally, this design has a hardware fault tolerance (HFT) of 0 (1oo1D architecture) and digital inputs designed to comply with IEC61131-2 (type 1) recommendations.

Features
  • Group-isolated 8-channel digital input compliant to IEC61131-2 (type 1)
  • Concept meets requirements of IEC61508-2:2010 (SIL2) and EN13849-1:2015 (Cat2 PLd) (assessed by TÜV SÜD)
  • Diagnostics and monitoring features
  • Miswiring protection (reverse polarity, digital input short/open/cross-wire)
  • Small footprint

A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDUEN7.PDF (1615 K)

Reference design overview and verified performance test data

TIDRZU0.PDF (769 K)

Detailed schematic diagram for design layout and components

TIDRZU1.PDF (49 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

TIDRZU2.PDF (510 K)

Detailed overview of design layout for component placement

TIDCFI0.ZIP (589 K)

Design file that contains information on physical board layer of design PCB

TIDRZU3.PDF (2566 K)

PCB layer plot file used for generating PCB design layout

TIDRZU4.ZIP (2441 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

Arm-based microcontrollers

RM41L23216/32 Bit RISC Flash MCU, Arm Cortex-R4F

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AND gates

SN74LVC1G11Single 3-input, 1.65-V to 5.5-V AND gate

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Buck converters (integrated switch)

LM51663V-65V Input, 500mA Synchronous Buck Converter With Ultra-Low Iq

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Buck converters (integrated switch)

LMR360064.2-V to 60-V, 0.6-A ultra-small synchronous step-down converter

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Buck converters (integrated switch)

TPS622302 MHz Ultra Small Step Down Converter with DCS-Control in 1x1.5 SON Package

Data sheet document-pdfAcrobat PDF open-in-new HTML
Digital isolators

ISO7741Robust EMC, quad-channel, 3/1, reinforced digital isolator

Data sheet document-pdfAcrobat PDF open-in-new HTML
ESD & surge protection ICs

TVS05005V flat-clamp surge protection device

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General-purpose op amps

TLV9001Single, 5.5-V, 1-MHz, RRIO operational amplifier for cost-optimized applications

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Load switches

TPS229175.5-V, 2-A, 80-mΩ , 10-nA leakage load switch adj. rise time and adj output discharge

Data sheet document-pdfAcrobat PDF open-in-new HTML
N-channel MOSFETs

CSD18541F560-V, N channel NexFET™ power MOSFET, single LGA 1.5 mm x 0.8mm, 65 mOhm, gate ESD protection

Data sheet document-pdfAcrobat PDF open-in-new HTML
NAND gates

SN74LVC2G1322-ch, 2-input, 1.65-V to 5.5-V NAND gates with Schmitt-Trigger inputs

Data sheet document-pdfAcrobat PDF
Noninverting buffers & drivers

SN74LVC1G125Single 1.65-V to 5.5-V buffer with 3-state outputs

Data sheet document-pdfAcrobat PDF open-in-new HTML
Series voltage references

REF30303-V, 50-ppm/°C, 50-µA in 3-pin SOT-23 package series (bandgap) voltage reference

Data sheet document-pdfAcrobat PDF open-in-new HTML
Shift registers

SN74AHC5948-Bit Shift Registers With Output Registers

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Shunt voltage references

TL431LIAdjustable precision shunt regulator with optimized reference current (pin layout: KRA)

Data sheet document-pdfAcrobat PDF open-in-new HTML
Supervisor & reset ICs

TPS3700High-voltage (18-V) window voltage detector for overvoltage and undervoltage monitoring

Data sheet document-pdfAcrobat PDF open-in-new HTML
Supervisor & reset ICs

TPS3852High-accuracy voltage supervisor with programmable window watchdog timer

Data sheet document-pdfAcrobat PDF open-in-new HTML
Temperature switches

TMP302Pin-Selectable Trip Point 1.4V-Capable Family of Temperature Switches

Data sheet document-pdfAcrobat PDF open-in-new HTML
eFuses & hot swap controllers

TPS26624.5-V to 60-V, 478mΩ, 0.025-0.88A eFuse with integrated input and output reverse polarity protection

Data sheet document-pdfAcrobat PDF open-in-new HTML

Technical documentation

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Type Title Date
* User guide TIDA-010049 TUEV Concept Report Jun. 07, 2019
* Design guide TUV-Assessed Digital Input Reference Design for IEC 61508 (SIL-2) Jun. 05, 2019

Related design resources

Hardware development

DEBUG PROBE
TMDSEMU200-U XDS200 USB Debug Probe

Software development

IDE, CONFIGURATION, COMPILER OR DEBUGGER
CCSTUDIO Code Composer Studio™ integrated development environment (IDE) HALCOGEN Hardware Abstraction Layer Code Generator for Hercules MCUs

Reference designs

REFERENCE DESIGN
TIDA-01552 8 Channel, 2-A High-Side Driver Reference Design for Digital Output Modules

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