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Hybrid, electric & powertrain systems

Electric power steering (EPS)

Products and reference designs
Block diagram

Electric power steering (EPS)

Block diagram

Overview

Our integrated circuits and reference designs will help you build a reliable, high-performance, safe electric power steering (EPS) system based on advanced power management, sensors, control and gate drivers.

Design requirements

  • Following state-of-the-art architecture regarding system redundancy in order to allow implementation of the system on the highest safety level.
  • Providing a steering wheel position sensing in ignition-off state with minimal quiescent current.
  • Optimizing size while maintaining the required safety and performance.

Block diagram

Find products and reference designs for your system.

Electric power steering (EPS)

M M Stator-Channel A Stator-Channel A Stator-Channel B Stator-Channel B Safety switch Safety switch Switch driver Switch driver Wired interface Wired interface CAN CAN PMIC PMIC WDT WDT DC/DC DC/DC Super-visor Super-visor LDOs LDOs Sensor DC/DC SensorDC/DC SPI SPI Digital processing Digital processing PWM PWM ADC ADC GPIOs GPIOs CAN CAN SPI SPI MCU core MCU core To power stages To power stages Self-diagnostics/monitoring Self-diagnostics/monitoring Temperature sensor Temperature sensor Reverse battery protection Reverse battery protection Ideal diode controller Ideal diode controller Alternatively to MCU Alternatively to MCU I/V Sense I/V Sense Analog front end Analog front end Analog front end Analog front end Current and voltage sense Current and voltage sense AMP AMP VREF VREF ADC ADC Safety logic Safety logic Comparator Comparator Phase separation relay Phase separation relay Driver Driver Power stage Power stage 3-phase bridge driver 3-phase bridge driver 3-phase bridge 3-phase bridge Sensing Sensing Rotor position sensor Rotor position sensor Steering wheel angle sensor Steering wheel angle sensor Torque sensor Torque sensor

Safety logic

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The safety logic implements microcontroller-independent protection mechanisms that react during failure modes. The failure inputs come from independent sensors, functional blocks as well as from the processing unit(s).

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Logic & voltage translation (13)
Noninverting buffers & drivers
  • SN74AHC1G125-Q1—Automotive, 1-ch 2.0-V to 5.5-V non-inverting buffer with 3-state output
    Data sheet: PDF | HTML
  • SN74LVC1G07-Q1—Automotive single 1.65-V to 5.5-V buffer with open-drain outputs
    Data sheet: PDF | HTML
  • SN74HCS365-Q1—Automotive hex buffers and line drivers with 3-state outputs
    Data sheet: PDF | HTML
  • SN74LVC1G17-Q1—Automotive single 1.65-V to 6.5-V buffer with Schmitt-Trigger inputs
    Data sheet: PDF | HTML
  • SN74AHCT125-Q1—Automotive 4-ch, 4.5-V to 5.5-V buffers with TTL-compatible CMOS inputs and 3-state outputs
    Data sheet: PDF | HTML
  • 74ACT16244—16-ch, 4.5-V to 5.5-V buffers with TTL-compatible CMOS inputs and 3-state outputs
    Data sheet: PDF | HTML
AND gates
  • SN74HCS21-Q1—Automotive, 2-ch, 4-input 2-V to 6-V high-speed (12 ns) AND gate with Schmitt trigger inputs
    Data sheet: PDF | HTML
  • SN74LVC1G08-Q1—Automotive, 1-ch, 2-input 1.65-V to 5.5-V 32-mA drive strength AND gate
    Data sheet: PDF | HTML
  • SN74HC21-Q1—Automotive, 2-ch, 4-input 2-V to 6-V 5.2-mA drive strength AND gate
    Data sheet: PDF | HTML
  • SN74AHC1G08-Q1—Automotive, single 2-input 2V to 5.5V AND gate
    Data sheet: PDF | HTML
  • SN74HC08-Q1—Automotive, 4-ch, 2-input, 2-V to 6-V 5.2 mA drive strength AND gate
    Data sheet: PDF | HTML
D-type flip-flops
  • SN74HCS74-Q1—Automotive Schmitt-trigger input dual D-type positive-edge-triggered flip-flops w/ clear and preset
    Data sheet: PDF | HTML
  • SN74LVC2G74-Q1—Automotive Catalog Single Positive-Edge-Triggered D-Type Flip-Flop with Clear and Preset
    Data sheet: PDF | HTML
Power management (2)
Supervisor & reset ICs
  • TPS3850-Q1—Automotive, window supervisor for OV & UV monitoring with window watchdog timer & programmable delay
    Data sheet: PDF | HTML
  • TLV803E—Low-power voltage supervisor (reset IC) with active-low open-drain output
    Data sheet: PDF | HTML

    Technical documentation

    View all 3
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    Type Title Date
    White paper Bridging 12 V and 48 V in dual-battery automotive systems 21 Nov 2018
    * Data sheet TPS65381-Q1 Multirail Power Supply for Microcontrollers in Safety-Relevant Applications datasheet (Rev. G) PDF | HTML 07 Dec 2023
    White paper Driving the green revolution in transportation 03 Oct 2016

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