Hi,

Feel free to "bite" the BOSCH design.
(See the block diagram of the IC CJ110).

But, doesn't it look familiar somehow?

Luciano

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CJ110 - Lambda Probe Sensing IC for LSU4.
http://www.semiconductors.bosch.de/p...y_extended.pdf


CJ120 - Lambda Probe Sensing IC for LSU4.x
Ri Measurement; SPI-Interface; Diagnostics
http://www.semiconductors.bosch.de/p...y_extended.pdf


Source:
http://www.semiconductors.bosch.de/e...ine/engine.asp

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Bosch LSU 4.2 Planar Wide Band Lambda Sensor:
http://wbo2.com/lsu/Y258K01005e03mar21eng.pdf

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