TPIC8101

ACTIVE

Vibration and Engine Knock Sensor Interface

Product details

Number of channels 2 CPU interface SPI Operating voltage (V) -0.03 to 5.5 Rating Automotive Operating temperature range (°C) -40 to 125
Number of channels 2 CPU interface SPI Operating voltage (V) -0.03 to 5.5 Rating Automotive Operating temperature range (°C) -40 to 125
SOIC (DW) 20 131.84 mm² 12.8 x 10.3
  • Qualified for Automotive Applications
  • AEC-Q100 Qualified With the Following Results:
    • Device Temperature Grade 1: –40°C to 125°C
      Ambient Operating Temperature Range
    • Device HBM Classification Level 3A
    • Device CDM Classification Level C6
  • Dual-Channel Knock Sensor Interface
  • Programmable Input Frequency Prescaler
    (OSCIN)
  • Serial Interface With Microprocessor (SPI)
  • Programmable Gain
  • Programmable Band-Pass Filter Center Frequency
  • External Clock Frequencies up to 24 MHz
    • 4, 5, 6, 8, 10, 12, 16, 20, and 24 MHz
  • Programmable Integrator Time Constants
  • Operating Temperature Range –40°C to 125°C
  • Qualified for Automotive Applications
  • AEC-Q100 Qualified With the Following Results:
    • Device Temperature Grade 1: –40°C to 125°C
      Ambient Operating Temperature Range
    • Device HBM Classification Level 3A
    • Device CDM Classification Level C6
  • Dual-Channel Knock Sensor Interface
  • Programmable Input Frequency Prescaler
    (OSCIN)
  • Serial Interface With Microprocessor (SPI)
  • Programmable Gain
  • Programmable Band-Pass Filter Center Frequency
  • External Clock Frequencies up to 24 MHz
    • 4, 5, 6, 8, 10, 12, 16, 20, and 24 MHz
  • Programmable Integrator Time Constants
  • Operating Temperature Range –40°C to 125°C

The TPIC8101 is a dual-channel signal processing IC for detection of premature detonation in combustion engine. The two sensor channels are selectable through the SPI bus. The knock sensor typically provides an electrical signal to the amplifier inputs. The sensed signal is processed through a programmable band-pass filter to extract the frequency of interest (engine knock or ping signals). The band-pass filter eliminates any engine background noise associated with combustion. The engine background noise is typically low in amplitude compared to the predetonation noise.

The detected signal is full-wave rectified and integrated by use of the INT/HOLD signal. The digital output from the integration stage is either converted to an analog signal, passed through an output buffer, or be read directly by the SPI.

This analog buffered output may be interfaced to an A/D converter and read by the microprocessor. The digital output may be directly interfaced to the microprocessor.

The data from the A/D enables the system to analyze the amount of retard timing for the next spark ignition timing cycle. With the microprocessor closed-loop system, advancing and retarding the spark timing optimizes the load/RPM conditions for a particular engine (data stored in RAM).

The TPIC8101 is a dual-channel signal processing IC for detection of premature detonation in combustion engine. The two sensor channels are selectable through the SPI bus. The knock sensor typically provides an electrical signal to the amplifier inputs. The sensed signal is processed through a programmable band-pass filter to extract the frequency of interest (engine knock or ping signals). The band-pass filter eliminates any engine background noise associated with combustion. The engine background noise is typically low in amplitude compared to the predetonation noise.

The detected signal is full-wave rectified and integrated by use of the INT/HOLD signal. The digital output from the integration stage is either converted to an analog signal, passed through an output buffer, or be read directly by the SPI.

This analog buffered output may be interfaced to an A/D converter and read by the microprocessor. The digital output may be directly interfaced to the microprocessor.

The data from the A/D enables the system to analyze the amount of retard timing for the next spark ignition timing cycle. With the microprocessor closed-loop system, advancing and retarding the spark timing optimizes the load/RPM conditions for a particular engine (data stored in RAM).

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Technical documentation

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Type Title Date
* Data sheet TPIC8101 Knock Sensor Interface datasheet (Rev. C) PDF | HTML 23 Mar 2015
EVM User's guide TPIC8101 EVM User's Guide 18 Dec 2015
Technical article Performance comparison between two automotive knock sensors PDF | HTML 23 Jun 2015
Analog Design Journal How to set-up a knock-sensor signal-conditioning system 15 Jul 2014
Application note TPIC8101 Knock Sensor Interface Technical Brief 09 Jan 2009

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

TPIC8101EVM — TPIC8101 automotive knock sensor evaluation module

The TPIC8101EVM provides an easy method for evaluating the TPIC8101 automotive knock sensor interface IC.  Software is included to quickly program the TPIC8101, and the included USB interface board provides all necessary signals to connect the TPIC8101 EVM to a knock sensor or a knock sensor (...)

User guide: PDF
Not available on TI.com
GUI for evaluation module (EVM)

SLIC023 TPIC8101 EVM GUI

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Supported products & hardware

Supported products & hardware

Products
UARTs
TPIC8101 Vibration and Engine Knock Sensor Interface
Hardware development
Evaluation board
TPIC8101EVM TPIC8101 automotive knock sensor evaluation module
Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Simulation tool

TINA-TI — SPICE-based analog simulation program

TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)
User guide: PDF
Reference designs

TIDA-00152 — Automotive acoustic knock sensor interface reference design

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 (...)
Design guide: PDF
Schematic: PDF
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SOIC (DW) 20 View options

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