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Servo drive functional safety module

Products and reference designs
Block diagram

Servo drive functional safety module

Block diagram

Overview

Our integrated circuits and reference designs help you create a servo drive functional safety module with reliable speed and position measurement along with robust digital IO to implement various functions per IEC 61800-5-2. Our products enable performing diagnostic coverage for detecting various faults which helps increase safe failure fraction.

Design requirements

Servo drive functional safety modules often require:

  • Power supplies which can operate up to or protected against 60-Vdc input.
  • Redundant multiprotocol encoder interfaces and protected digital inputs/outputs.
  • Cross monitoring of signals and enabling single hardware fault tolerance.
  • Continuous self-diagnosis of circuits through monitoring voltage rails and temperature.
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Block diagram

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Servo drive functional safety module

VDD 2 VDD 2 VDD 1 VDD 1 Connector to: resolver, encoder Connector to: resolver, encoder Resolver or SIN/COS encoder (analog) Resolver or SIN/COS encoder (analog) Absolute or incremental encoder (digital) Absolute or incremental encoder (digital) Safe digital input Safe digital input Safe digital output Safe digital output 24 V field supply 24 V field supply Board to board connection Board to board connection Redundant supplies Redundant supplies Logic input power protection Logic inputpower protection eFuse eFuse Hot swap controller Hot swapcontroller Voltage supervisor Voltage supervisor Over voltage switch Over voltage switch Non-isolated DC/DC logic / encoder power supply Non-isolated DC/DC logic / encoder power supply Sequencer Sequencer DC/DC DC/DC PMIC PMIC LDO LDO Encoder power protection Encoder power protection eFuse eFuse Load switch Load switch Voltage supervisor Voltage supervisor Field input power protection Field input power protection eFuse eFuse Non-isolated DC/DC field power supply Non-isolated DC/DC field power supply LDO LDO DC/DC DC/DC 1 X digital output interface 1 X digital output interface Digital isolator Digital isolator Logic Logic High side load switch High side load switch Low side load switch Low side load switch High side load switch High side load switch Digital isolator Digital isolator Digital isolator Digital isolator Isolated input receiver Isolated input receiver Digital processing Digital processing MCU MPU MCUMPU Memory Memory Memory Memory MCU MPU MCUMPU 1 X digital input interface 1 X digital input interface Isolated input receiver Isolated input receiver Logic Logic Isolated input receiver Isolated input receiver Board to board interface Board to board interface Transceiver Transceiver Digital isolator Digital isolator Buffer Buffer Protection Protection Self-diagnostics/monitoring Self-diagnostics/monitoring Voltage supervisor Voltage supervisor Watchdog timer Watchdogtimer Temp Temp Comp Comp ADC ADC SIN/COS AFE SIN/COS AFE Ref Ref Comp Comp Amp Amp ADC ADC Signal quality monitoring Signal quality monitoring Protection Protection Resolver excitation Resolver excitation DAC DAC Amp Amp Protection Protection Encoder interface Encoder interface Mux Mux Level translator Level translator RS-485/RS-422 RS-485/RS-422 Protection Protection Comp Comp Signal quality monitoring Signal quality monitoring

Sine/cosine analog front end

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Converts SIN/COS differential inputs from resolver or SIN/COS encoder to digital values. Further it could also generate quadrature signals from SIN/COS signals and monitors for signal quality. Less propagation delay, offset, drift and matched parts are the key parameters.

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Amplifiers (12)
Comparators
  • TLV1702—Dual high voltage, low power comparator
    Data sheet: PDF | HTML
  • TLV3601—2.5-ns high-speed rail-to-rail comparator with push-pull outputs
    Data sheet: PDF | HTML
  • LM2903—Dual differential comparator
    Data sheet: PDF | HTML
  • TLV3202—5.5-V, high-speed, dual push-pull comparator
    Data sheet: PDF | HTML
General-purpose op amps
  • TLV9061—Single, 5.5-V, 10-MHz, RRIO operational amplifier for cost-optimized applications
    Data sheet: PDF | HTML
  • TLV9352—Dual, 40-V, 3.5-MHz, low-power operational amplifier
    Data sheet: PDF | HTML
  • TLV9354—Quad, 40-V, 3.5-MHz, low-power operational amplifier
    Data sheet: PDF | HTML
High-speed op amps (GBW ≥ 50 MHz)
  • OPA365—2.2V, 50MHz, Low-Noise, Single-Supply Rail-to-Rail Operational Amplifier
    Data sheet: PDF | HTML
  • OPA2365—2.2V, 50MHz, Low-Noise Single-Supply Rail-to-Rail Operational Amplifiers
    Data sheet: PDF | HTML
Fully differential amplifiers
  • THS4551—Low Noise, Precision, 150MHz, Fully Differential Amplifier
    Data sheet: PDF | HTML
  • THS4531—Ultra low power 0.25mA, RRO, fully differential amplifier
    Data sheet: PDF | HTML
  • THS4531A—Ultra Low Power, RRO, Fully-Differential Amplifier
    Data sheet: PDF | HTML
Data converters (6)
Precision ADCs
  • ADS8860—16-bit, 1-MSPS, 1-channel SAR ADC with single-ended input, SPI and daisy chain
    Data sheet: PDF | HTML
  • ADS8350—Dual 750kSPS 16-Bit Simultaneous-Sampling SAR Analog-to-Digital Converter (ADC)
    Data sheet: PDF | HTML
  • ADS7952—12 bit, 1 MSPS, 12 Ch, single ended, micro power, sr i/f, SAR ADC
    Data sheet: PDF | HTML
  • ADS7254—12 Bit, 1 MSPS, Dual, Simultaneous Sampling Differential SAR ADC
    Data sheet: PDF | HTML
  • ADS7854—SAR ADC, dual, differential input, 1 MSPS, 14-bit, simultaneous sampling
    Data sheet: PDF | HTML
  • ADS8354—Dual 700kSPS 16-Bit Simultaneous-Sampling SAR Analog-to-Digital Converter (ADC)
    Data sheet: PDF | HTML
Passive and discrete (4)
ESD protection diodes
  • TPD6E001—6 channel 1.5-pF, 5.5-V, ±8-kV ESD protection diode with 1-nA max leakage & VCC pin for USB 2.0
    Data sheet: PDF | HTML
  • TPD2E001—Dual 1.5-pF, 5.5-V, ±8-kV ESD protection diode with 1-nA max leakage & VCC pin for USB 2.0
    Data sheet: PDF | HTML
  • TPD2E007—Dual 10-pF, ±13-V, ±8-kV ESD protection diode for AC Signal Data Interfaces
    Data sheet: PDF | HTML
TVS diodes
  • TVS1401—14-V bidirectional flat-clamp surge protection device
    Data sheet: PDF | HTML
Power management (5)
Series voltage references
  • REF35—650-nA quiescent current, 12-ppm/°C drift, ultra-low-power precision voltage reference
    Data sheet: PDF | HTML
  • REF50E—Enhanced low-noise (0.5µVpp/V), low-drift (2.5ppm°/C), wide-VIN (42V) precision voltage reference
    Data sheet: PDF | HTML
  • REF4132—12-ppm/°C low-noise low-power precision voltage reference
    Data sheet: PDF | HTML
  • REF2025—8-ppm/°C drift, low-power, dual-output Vref & Vref/2 voltage reference
    Data sheet: PDF | HTML
  • REF20-Q1—Automotive low-drift, low-power, series voltage reference
    Data sheet: PDF | HTML
  • TIDA-00176—Interface to Sin/Cos Encoders with High-Resolution Position Interpolation Reference Design
    Design guide: PDF | HTML Schematic: PDF
  • TIDA-00178—Interface to a Sin/Cos Encoder with Sitara AM437x Reference Design
    Design guide: PDF Schematic: PDF
  • TIDA-00202—Interface to a HIPERFACE Position Encoder Reference Design
    Design guide: PDF Schematic: PDF
  • TIDA-01527—Discrete Resolver Front-End Reference Design With C2000™ Microcontroller and ±0.1° Accuracy
    Design guide: PDF Schematic: PDF Schematic: PDF
  • TIPD117—Dual-channel data acquisition reference design for optical encoders, 12 bits, 1 MSPS
    Schematic: PDF Schematic: PDF

Technical documentation

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Type Title Date
White paper Understanding failure modes in isolators (Rev. B) PDF | HTML 29 Jan 2024
Application note C2000™ Hardware Built-In Self-Test (Rev. A) PDF | HTML 28 Sep 2022
E-book Ein Techniker-Leitfaden für Industrieroboter-Designs 28 Oct 2020
Functional safety information The state of functional safety in Industry 4.0 28 Jul 2022
Functional safety information Functional Safety: A tunable FMEDA for C2000™ MCUs 28 Jul 2022
Functional safety information Enabling Functional Safety Using SafeTI Diagnostic Library 28 Jul 2022
Application brief How to Improve Speed and Reliability of Isolated Digital Inputs in Motor Drives 18 Dec 2017
E-book E-book: An engineer’s guide to industrial robot designs 16 Nov 2020
More literature Decentralized servo architecture webinar 01 Mar 2021
More literature Decentralized servo architecture webinar 01 Mar 2021

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