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Details, datasheet, quote on part number:TPIC8101DW
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Datasheet text preview:
TPIC8101 KNOCK SENSOR INTERFACE
SLIS110 - APRIL 2003
features
D Dual-Channel Knock Sensor Interface D Programmable Input Frequency Prescaler D D D D D D
(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
DW PACKAGE (TOP VIEW)
VDD GND Vref OUT NC NC INT/HOLD CS XIN XOUT
1 2 3 4 5 6 7 8 9 10
20 19 18 17 16 15 14 13 12 11
CH1P CH1N CH1FB CH2FB CH2N CH2P TEST SCLK SDI SDO
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).
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.
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.
Copyright 2003, Texas Instruments Incorporated
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
1
SLIS110 - APRIL 2003
TPIC8101 KNOCK SENSOR INTERFACE
functional block diagram
Vref VDD/2 + - CH1P CH1N + - Mux 3rd Order AAF CH2P CH2N + - SAR 10-Bit ADC fs = 200 kHz
CH1FB
CH2FB
Programmable Gain
Programmable Band-Pass Filter DSP
Rectifier
Programmable Integrator
R2R 10-Bit DAC fs = 200 kHz
+ -
SPI Test Mode DSP Control
VDD
GND
OUT
SDO SDI
SCLK
CS
TEST
INT/HOLD XIN
XOUT
2
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
TPIC8101 KNOCK SENSOR INTERFACE
SLIS110 - APRIL 2003
Terminal Functions
TERMINAL NAME VDD GND Vref OUT NC INT/HOLD CS XIN XOUT SDO SDI SCLK TEST CH2P CH2N CH2FB CH1FB CH1N NO. 1 2 3 4 5, 6 7 8 9 10 11 12 13 14 15 16 17 18 19 I / Pulldown I / Pullup I O O I / Pullup I / Pullup I / Pullup I I O O I TERMINAL TYPE (PULLUP/PULLDOWN) I I O O 5-V input supply Ground connection Supply reference generator with external bypass capacitor Buffered integrator output No connection Selectable for integrate (high) or hold (low) mode (with internal pulldown) Chip select for SPI communications (active low with internal pullup) Inverter input for oscillator Inverter output for oscillator Serial data output for SPI bus Serial data input line SPI clock Test mode (active low), open for normal operation Positive input for amplifier #2 Negative input for amplifier #2 Output of amplifier #2, for feedback connection Output of amplifier #1, for feedback connection Negative input for amplifier #1 DESCRIPTION
CH1P 20 I Positive input for amplifier #1 These terminals are to be used for test purposes only and are no connected in the system application. No signal traces should be connected to the NC terminals.
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
3
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