Automotive acoustic knock sensor interface reference design


Design files


This TIDA-00152 reference design utilizes a dual-channel, signal processing IC for detection of premature detonation in combustion (gasoline) engines. The heart of this design is the TPIC8101 that serves as an interface between acoustical sensors or accelerometers and automobile engine management systems. Programmable features on this device include the selection of engine knock detection sensitivity, engine resonance frequency, and sampling rate control of on-board ADC and DAC in signal processing chain. These features allow the TPIC8101 to be a flexible interface that can adapt to cost and/or processing time constraints of the customer.

  • 2 channel device (cars usually have two knock sensors)
  • Programmable features (gain, bpf center freq, input freq pre-scalar)
  • Broad uC selection (nine selectable external clock frequencies)
  • Full SoC (can be used for general analog signal processing)
  • Xtal-less solution (providing there is a clock from the MCU)
  • AEC-Q100
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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.

TIDU286.PDF (308 K)

Reference design overview and verified performance test data

TIDU285.PDF (631 K)

Test results for the reference design, including efficiency graphs, test prerequisites and more

TIDC366.ZIP (1474 K)

Detailed schematic diagram for design layout and components

TIDR519.PDF (340 K)

Detailed schematic diagram for design layout and components

TIDR520.PDF (107 K)

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

TIDC365.ZIP (109 K)

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


Includes TI products in the design and potential alternatives.


TPIC8101Vibration and Engine Knock Sensor Interface

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
Technical article Performance comparison between two automotive knock sensors PDF | HTML Jun. 23, 2015
User guide TIDA-00152 User's Guide Apr. 11, 2014
Test report TIDA-00152 Test Results Apr. 11, 2014
Design guide TIDA-00152 Overview Apr. 11, 2014

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