Texas Instruments | TPIC8101 Knock Sensor Interface Technical Brief | Application notes | Texas Instruments TPIC8101 Knock Sensor Interface Technical Brief Application notes

Texas Instruments TPIC8101 Knock Sensor Interface Technical Brief Application notes
SLIT120 – January 2009
TPIC8101 Knock Sensor Interface Technical Brief
.....................................................................................................................................................
1.1
TPIC8101 Summary
The TPIC8101 is a dual-channel, signal processing IC for detection of premature detonation in combustion
(gasoline) engines. This device 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, clock synchronization 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.
Part number
TPIC8101
VDD (max.)
7V
Operating voltage (VDD)
5 V ± 0.25 V (± 5%)
IDDQ (max.)
7.5 mA
IDD (max.)
20 mA
Fs (Typ.)
200 kHz
ADC resolution (min.)
10 bits
DAC resolution (min.)
10 bits
Sampling frequency
198 - 202 (kHz)
Bandpass freq. spectrum
35 kHz - 55 kHz
Frequency response (1kHz - 20kHz)
± 1 dB (reference @ 1 kHz)
Gain of bandpass filter
2 (typ.)
CMRR
60-80 dB (signal input channels)
Supported communication protocol(s)
SPI
Operating temperature
-40°C - +125°C
Storage temperature
-65°C - +150°C
Package / pincount
SOIC / 20
Packing / delivery
VDD
OUT
4.7 µ F
A/D
R2
CH1FB
3.3 nF
CS
CH1N
SCLK
R1
Knock Sensor 1
TPIC8101
CH1P
TEST
100 nF
CH2P
CH2FB
3.3 nF
CH2N
R1
Knock Sensor 2
INT/HOLD
470 pF
XIN
R2
GND
Note: R1 is greater than 25 kΩ.
Symbol
VDD
GND
Vref
OUT
NC
INT/HOLD
8
9
10
11
12
13
14
15
16
17
18
19
20
CS
XIN
XOUT
SDO
SDI
SCLK
TEST
CH2P
CH2N
CH2FB
CH1FB
CH1N
CH1P
SDI
SDO
Microprocessor
Vref
Pin
1
2
3
4
5,6
7
1kΩ
XOUT
1MΩ
Description
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 pullup)
Chip Select for SPI comm. (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
Positive input for amplifier #1
For more information, contact the sales office or distributor nearest you. This contact info cn be found on our web site at http://www.ti.com
SLIT120 – January 2009
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Technical Brief
1
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