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Normally order VEMS ECU with the correct number of knock inputs and see GenBoard/Manual/KnockSensor and [http://vems.hu/vt/help/v3/v3_knock_control.html VT help knock configuration] If missed to order VEMS ECU with the correct number of knock input - or need some deeper diagnostics, you're on your own, but these can be useful (and the HW is not very complex at all): '''How to install if home-modding ?'''. Take ESD precautions ! * I did buy a PnP Audi AAN box but forgot to order knock X 2. * installed the knock chip and crystal so is there anything else I have to do to get it to work? ** TPIC8101DW (take care of orientation) ** 4 MHz crystal (with insulator under) AFAIK that is all, but we test it (and enabling: configuring it is needed). * [http://vems.hu/vt/help/v3/v3_knock_control.html VT help/knock] * Very simple circuit (we usually test with sound audio signal, with 24-1 1 of the channels have different amplitude). * The squarewave pulses have 6..7 kHz component also. * Otherwise generated c270 signal around 2900 RPM also makes sense : 900 / 60 * 135 = 6525 Hz (6700 Hz is not far from knock freq of automotive cyl bore-sizes) ---- The knock schematic and layout is exactly same on AAN as on v3.6 or other v3.x, see GenBoard/VerThree/Schematic The '''signal path is only a few resistor and capacitor, if the TPIC8101 is there with the 4MHz quartz''', not much else to it. See below '''while following schematic''' if need more. ---- '''Old, but hasn't changed AFAIK''' '''GenBoard/VerThree knockdetection HW''' '''Needed for Knock Sensor input:''' :R1, R2 Knock Channel 1 (10..22k) (analog signal amplitude gain can be adjusted with these; but also in the digital domain - in config) :R3, R4 Knock Channel 2 (same as R1,R2) :R17 1M :C1 Knock Channel 1 (100nF) :C2 Knock Channel 2 (same as C1) :C14 0.22uF :C16 100nF :C18, C19 22pF :Y2 4MHz XTAL (16MHz might work with matching config) :U5 TPIC8101DW (not in rescue kit! Optional, see WebShop) C17 is no longer used. (was: 2.2nF, can now be left off) V3.2: if you ordered knock-kit (in same order as genboard) than U5=TPIC8101DW and Y2=crystal already soldered onboard (crystal missing on a few boards sent out before 20041030.) ---- Here you find the top-side components, the second channel uses components on the bottom side too. (''thanks to Mr Grogan for pic'') http://www.vems.hu/files/genboardv3/assembly/v3.3_vems_knock_components.jpg The knock sensor chip installation: Pin 1 points to the connectors-side. (so pin 1 points to the short side of the board) http://vems.hu/www.vems.co.uk/VEMS/KnockChipPads.jpg http://vems.hu/www.vems.co.uk/VEMS/KnockChipInPlace.JPG The crystal goes next to the chip. http://vems.hu/www.vems.co.uk/VEMS/KnockChipCrystal.jpg For the 2nd channel, the following components are also needed: * 100nF (or 220nF, does not matter which) in the diagonal position * 22k in the diagonal position. As this is in series with the 100nF, they can be swapped: it does NOT matter if the resistor or the cap is closer to the input * 22k (on top side, next to R2) ---- '''v3.3''' The knockchip and 4MHz crystal is installed (if ordered v3.3 with knock-kit), the only thing needed is to connect the sensor input through the 3 pin header (pads) at the northwest corner (looking at the "top") : * North pad (close to board-edge): knockA signal (channel 0) (usually through EC18pin3) * Middle pad: knock GND (usually through EC18pin2) * Southern pad: knockB signal (channel 1) - usually not used TODO: take pictures of board region around knock chip If the knock signal is not routed via EC18, it can be routed through a connector or flying loom cable mounted through frontplate or endplate.
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