HIP9011EVAL1Z Intersil, HIP9011EVAL1Z Datasheet - Page 5

• Manufacturer Part Number: HIP9011EVAL1Z
• Description: BOARD EVALUATION FOR HIP9011
• Manufacturer: Intersil

Specifications of HIP9011EVAL1Z

• Main Purpose: Special Purpose, Engine Knock Signal Processor
• Utilized Ic / Part: HIP9011
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Secondary Attributes: -
• Embedded: -
• Primary Attributes: -

near the level/value that was determined when the GAIN
stage was set at the lowest value of gain. From this higher
gain value/operating condition, the system could then
determine that the sensor has been disconnected.
Another approach that has been suggested is to, at engine
start up, advance the engine timing to the knock level and
observe the INTOUT signal. If knock cannot be detected, the
sensor is assumed open.
Application Tips
Here are several important points about the application of
the HIP9011 that will enhance the performance of a system
using this IC. First, as mentioned previously, it is suggested
that a coupling capacitor be placed in series with the
transducer. This minimizes the possibility of pulling the
inverting input of the operational amplifiers within the IC to
ground. Grounding the inverting input forces the amplifier
output high, thus limiting the signal handling ability of the
amplifiers.
Another important point is to insure that the input amplifier
and following stages operate at near their maximum peak to
peak signal level without overload under the maximum
expected input. Doing this allows the integrator stage to be
set to lower gain settings, larger time constants, and thus
reduces sensitivity in the output stage. This is analogous to a
public address amplifier where the master gain control,
analogues to the integrator stage, is set to full gain and the
input gain control set to minimum gain. Under these
conditions the public system will be noisy.
As a goal keep the output of the input operational amplifiers
within half of the maximum expected output swing. This will
insure that the following analog initializing filter has sufficient
dynamic range. The switched capacitor gain stage can be
used to either attenuate or amplify the signal. By observing
these conditions, the signal going into the integrator stage
will usually require a large time constant to keep the
integrator from saturating. Also, remember that the effective
system gain can be increased by increasing the integration
window when higher gain is needed, usually, at lower engine
speeds.
5
Application Note 9770
Other Applications
Because of the extremely unique design of this signal
processing IC with over 130,000 programming
combinations, the user is afforded maximum flexibility of
signal detection and processing. Other applications are
possible such as security systems with acoustical spectrum
analysis with the aid of the filter within this device. Room,
area or system profiles can be stored and compared with
current values.
Analysis of heavy transmissions or other machinery with
sensors used to detect bearing wear and other acoustical
qualities is possible. Here preventive maintenance would be
one of the key qualities.
November 6, 2006
AN9770.1