4-1

HIP9011

Engine Knock Signal Processor

The HIP9011 is used to provide a method of detecting

premature detonation often referred to as “Knock or Ping” 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 “V” 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.

Features

• Two Sensor Inputs

• Microprocessor Programmable

• Accurate and Stable Filter Elements

• Digitally Programmable Gain

• Digitally Programmable Time Constants

• Digitally Programmable Filter Characteristics

• On-Chip Crystal Oscillator

• Programmable Frequency Divider

• External Clock Frequencies up to 24MHz

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

Applications

• Engine Knock Detector Processor

• Analog Signal Processing Where Controllable Filter

Characteristics are Required

Simplified Block Diagram

Ordering Information

PART NUMBER

TEMP.

PACKAGE

PKG.

NO.

HIP9011AB

-40 to 125

20 Ld SOIC

M20.3

INTOUT

PROGRAMMABLE

2

RECTIFIER

PROGRAMMABLE

INTEGRATOR

40

µs

32 STEPS

OUTPUT

DRIVER

PROGRAMMABLE

BANDPASS

FILTER

1

64 STEPS

REGISTERS

AND

STATE MACHINE

STAGE

TO SWITCHED

CAPACITOR

NETWORKS

SCK

CS

SI

SO

INT/HOLD

TEST

OSCIN

OSCOUT

VMID

CH0FB

CH0IN

CH1FB

CH1IN

POWER SUPPLY

AND

BIAS CIRCUITS

DIVIDER

PROGRAMMABLE

CH0NI

CH1NI

SAMPLE

AND HOLD

AND

ACTIVE

FULL WAVE

64 STEPS

GAIN

-

+

-

+

CLOCK

SPI

INTERFACE

Data Sheet

November 1998

File Number

4367.1

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

http://www.intersil.com or 407-727-9207