Knock sensor chip from Harris

[Benoit Robert]

</unlurk> (as seen somewhere else)

Harris makes (or used to make) a chip called
an Engine Knock Signal Processor. The part
number is HIP9010 and you can easily get
a hold of the data sheets with their
Automatic FaxBack system at 407-724-7800.

It uses two piezo sensors and switches
one for sensing knock and the other to 
cancel background noise. The chip will
subtract the background noise and filter
based on the parameters sent to the chip.
Hookup is via an SPI bus and you can program 
reference filter frequency, knock filter 
frequency and a bunch of other things.
I haven't used it but from the data sheet,
it looked like pretty comprehensive. Good
reading.

Regards to all,                 B.Robert

</lurk>