Yes Karl is cool. He's basically made a circuit that's almost the same as the BOSH chip and he's done a good job documenting it. However much easier to get the parts for Karls circuit. Last I recall his code would decode the WO2 and and generate a NO2 signal. It should be fairly easy to make into a different module.
Oh, also keep an eye on licence, so don't blind copy. Karl seems cool about it, however there are others that will blow a gasket.
Wonder if I could include this into the MAP board for my motorcycle? I know LOTS of people that would like O2 feedback control.
That would mean I'd be modulating the MAP sensors to control AFR though, so might need to bump the MCU from MSP430 to ARM M4...
... need engine speed input too.
You can lead the horticulture but you can't make them think.
For IRL3803 the Vgs is 1.0V, so you should be fine with 3.3V drive.
The TC4427 is the same chip we use for the IGN driver. So we are fine with MCU drive. However I don't know if 3.3V will be enough voltage for the output. I say try it and see what happens. If you end up with 100% duty cycle, then it needs 5V. Also remember the output can be separate from the drive. If you populate U2 and connect to 12V battery, you'll have 5V on your output, but you can drive with 3.3V.
kb1gtt wrote:The TC4427 is the same chip we use for the IGN driver.
external TC4427 was my plan for pump driver - the original board does not have TC4427, just that op-amp magic for pump driver which I do not get completely. Does it mean pump is not consuming much current?
That pump thing is a special thing. I think it's an AN signal, but it might have some PWM going on. I'd use the original op-amp as it has know gain, offset, ect.