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TPIC8101DWG4 Datasheet(PDF) 1 Page - Texas Instruments |
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TPIC8101DWG4 Datasheet(HTML) 1 Page - Texas Instruments |
1 / 20 page TPIC8101 KNOCK SENSOR INTERFACE SLIS110A − APRIL 2003 − REVISED MAY 2005 1 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 features D Dual-Channel Knock Sensor Interface D Programmable Input Frequency Prescaler (OSCIN) D Serial Interface With Microprocessor (SPI) D Programmable Gain D Programmable Band-Pass Filter Center Frequency D External Clock Frequencies up to 24 MHz − 4, 5, 6, 8, 10, 12, 16, 20, and 24 MHz D Programmable Integrator Time Constants D Operating Temperature Range −40°C to 125 °C applications D Engine Knock Detector Signal Processing D Analog Signal Processing With Filter Characteristics description 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 optimize the load/RPM conditions for a particular engine (data stored in RAM). Copyright 2003 − 2005, Texas Instruments Incorporated PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 VDD GND Vref OUT NC NC INT/HOLD CS XIN XOUT CH1P CH1N CH1FB CH2FB CH2N CH2P TEST SCLK SDI SDO DW PACKAGE (TOP VIEW) |
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