HIP9011 Datasheet, PDF(1/11 Page) Intersil Corporation

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HIP9011 Datasheet, PDF (1/11 Pages) Intersil Corporation – Engine Knock Signal Processor

Data Sheet

HIP9011

November 1998 File Number 4367.1

Engine Knock Signal Processor

The HIP9011 is used to provide a method of detecting

premature detonation often referred to as âKnock or Pingâ in

internal combustion engines.

The IC is shown in the Simplified Block Diagram. The chip

can select between one of two sensors, if needed for

accurate monitoring or for âVâ type engines. Internal control

via the SPI bus is fast enough to switch sensors between

each firing cycle. A programmable bandpass filter

processes the signal from either of the sensor inputs. The

bandpass filter can be selected to optimize the extraction

the engine knock or ping signals from the engine

background noise. Further single processing is obtained by

full wave rectification of the filtered signal and applying it to

an integrator whose output voltage level is proportional to

the knock signal amplitude. The chip is under

microprocessor control via a SPI interface bus.

Ordering Information

PART NUMBER

HIP9011AB

TEMP.

RANGE (oC)

PACKAGE

-40 to 125 20 Ld SOIC

PKG.

NO.

M20.3

Simpliï¬ed Block Diagram

Features

â¢ Two Sensor Inputs

â¢ Microprocessor Programmable

â¢ Accurate and Stable Filter Elements

â¢ Digitally Programmable Gain

â¢ Digitally Programmable Time Constants

â¢ Digitally Programmable Filter Characteristics

â¢ On-Chip Crystal Oscillator

â¢ Programmable Frequency Divider

â¢ External Clock Frequencies up to 24MHz

- 4, 5, 6, 8, 10, 12, 16, 20, and 24MHz

â¢ Operating Temperature Range -40oC to 125oC

Applications

â¢ Engine Knock Detector Processor

â¢ Analog Signal Processing Where Controllable Filter

Characteristics are Required

CH0FB

CH0IN -

CH0NI +

CH1FB

CH1IN

CH1NI +

PROGRAMMABLE

GAIN

STAGE

2- 0.111

64 STEPS

POWER SUPPLY

AND

BIAS CIRCUITS

VMID VDD GND

PROGRAMMABLE

BANDPASS

FILTER

1-20kHz

64 STEPS

ACTIVE

FULL WAVE

RECTIFIER

PROGRAMMABLE

INTEGRATOR

40 - 600Âµs

32 STEPS

OUTPUT

DRIVER INTOUT

AND

SAMPLE

AND HOLD

TO SWITCHED

CAPACITOR

NETWORKS

REGISTERS

AND

STATE MACHINE

TEST

PROGRAMMABLE

DIVIDER

OSCIN

CLOCK OSCOUT

SPI

INTERFACE

SCK

INT/HOLD

4-1

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

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