HIP9011ABT データシートの表示（PDF） - Intersil

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HIP9011ABT

Engine Knock Signal Processor

Intersil 

HIP9011

+5V

VDD

0.022µF

VMID

GND

HIP9011

TRANSDUCERS

CH0NI

CH1NI

CH1IN

Rin

CH1FB

RF

CH0IN

Rin

CH0FB

RF

OSCIN

SI

SO

SCK SPI BUS

CS

INT/HOLD

TEST +5V

20pF 4MHz

20pF

OSCOUT

INTOUT

EXAMPLE CASE USING IDEAL SYSTEM EQUATION

When the Input Signal is Present for the Period tINT:

INTOUT (Volts) =

VIN × GIN ×



 G B P R

×

GPR

×

1-π-

×

-t-ti--nc---t

×

GDSE

+ VRESET

Where:

VIN = 200mVP-P, Continuous AC Signal

GIN = 1.0, Ratio of RF to RIN

GPR = 0.190

GBPF = 2.0 Ideal Gain Value

tC = 200µs

tINT = 2ms

GDSE = 2.0 Ideal Gain Value

VRESET = 0.125V, Typical Value

INTOUT (Volts) =

200x10-3*1* [2 * 0.19 * 0.318 * 2x10-3/200x10-6*

2]+0.125

= 0.4833 + 0.125

= 0.608V

1MΩ

A/D

CONVERTER

MICROPROCESSOR

FIGURE 3. SIMPLIFIED BLOCK DIAGRAM OF THE HIP9011 IN AN AUTOMOTIVE APPLICATION

Description of the HIP9011 Operation

This IC is designed to be a universal digitally controlled, analog

interface between engine acoustical sensors or accelerometers

and internal combustion engine fuel management systems.

Two wideband input amplifiers are provided which will allow the

use of two sensors. These sensors be of the piezoelectric type,

that can be mounted in optimum locations on either in-line or V

type engine configurations.

Output from these input amplifiers are directed to a channel

select mux switch and then into a 3rd order antialiasing filter.

The output signal is then directed to two programmable gain

stages, where one stage inverts or shifts the knock signal 180

degrees. The gain stage signals are outputted to two

programmable bandpass filter stages. Outputs from the two

BPF stages are then full wave rectified before being digitally

integrated by the programmable integrator. The integrator

output is applied to a line driver for further processing by the

engine fuel management control system. The gain, bandpass

filter and integrator stage settings are programmable from a

microprocessor via the SPI Bus Interface

6

Broadband piezoelectric ceramic transducers used for the

engine signal pickup have device capacitances in the order

of 1100pF and output voltages that range from 5mV to 8V

RMS. During normal engine operation, a single input

channel is selected and applied to the HIP9011. The engine

background noise is typically well below in amplitude than

the pre-detonation noise. Therefore, the bandpass filter

stages can be optimized to further discriminate between

engine background and combustion noise and pre-

detonation noise.

A basic approach to engine pre-detonation systems is to

only observe engine background during the time interval

that noise is expected and if detected, retard timing. This

basic approach does not require the sensitivity and

selectivity that is needed for a continuously adjustable

solution. Enhanced fuel economy and performance is

obtainable when this IC is coupled with a microprocessor

controlled fuel management system.

FN4367.2

January 6, 2006

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