fb_inj fb_inj JS0 JS JS U JS Vsyn JS V PT/K 0 VSS PT/K GMXF- GMXF PT/K OS- JS OS PT/K OS- OS PT/K Squirt- RST PT/K ccel- PT0 PT/K Idle- JS Warmup- PT PT0/K0 FP- PT VSS 0 PT V TX- PT PT/ 0 JS JS0 RX- PT0/Tx PT/ PT/Rx PT/ - IRQ- IRQ PT/ JS - PT0/SS PT/ - PT/MISO PT/ JS - PT/MOSI PT/ - PT/SPSK PT0/0 0- VSS PT/TH 0 PWM- V PT/TH0 JS PWM0- R V H0GP 0K 0. PU (or MS-II aughtercard) JS Note : For MS-II daughtercard implementation, the following signals apply to IP-0 socket: - NHout - NLout - V for I stepper - IGN - Knk Window - I - I - I - I Megasquirt - PU -.. owling Note : Jumper location JS (pin ) tied to +V for MS-II PU board implementation for enabling I stepper driver. Size ocument Number Rev Rev.M - SM. ate: Monday, February, 00 Sheet of
0. Vcc 0- Manifold bsolute Pressure Vout Gnd MP MPX0P R K-/W R.K-/W - - MT.K-/W 0.00.0 R ootloader ntry Manifold ir Temp 0K H R R LT -.K-/W Header.K-/W 0.00.0 0. oolant Temp R V R 0K attery Voltage TPS 0.00 R K-/W 0. Throttle Position - M 0 0. O R R0 K-/W - xhaust Gas Oxygen Megasquirt - Input Size ocument Number Rev Rev.M - SM. ate: Monday, February, 00 Sheet of
V R Note Note Note.K OptoOut J Tsel IRQ- OptoIn VrOut R N00 N00 0.0 Wing John 0-/W V ave d U XG XG 0 0. 0.00 NS R K-/W Opto-isolator VrOutInv JP Opto-return Jumper V TachIn Note R R 00K Tach Input Select R 00K Note Zero-rossing V Setpoint K R Q Hysteresis dj. Vrin R R 0K PZT0T U Q + K-/W K-/W R K PZT0T - M0R R 0. 0.0 V N00 True zero-crossing detector 00K R K U Note : One of two possible tach input otions are enabled during P build-up - opto-isolated for ignition coils, or variable-reluctrance (VR) tach input for VR, Hall, and IS setups. To select opto-isolator tach circuit, jumper TachSelect to OptoIn and jumper Tsel to OptoOut. For VR tach circuit (non-invert) jumper TachSelect to VrIn and jumper Tsel to VrOut. For inverted VR tach signaling, jumper VrOutInv to Tsel. R M R 00K K V R K R0 - + R 00K M0R Note : iode may not be needed with hall sensor (operating at volts) - install jumper in its place. Note : iode is normally a N00 installed to add an additional 0.V forward series voltage drop (i.e. + + Vf_opto_diode = 0. + 0. +. =.V). For hall sensor use, install jumper in place of diode. To use in ignition coil primary flyback pulse detection trigger, replace with V zener (connected in reverse, operate in avalanche mode), eliminate 0, and lower value to 0pf. Megasquirt - Tach Input Note : Jumper locations XG and XG normally jumpered. For extreme ignition coil noise, XG can be grounded directly to engine via external connection. XG can also be used for Hall sensor open-collector operation. Size ocument Number Rev Rev.M - SM. ate: Monday, February, 00 Sheet of
V R 0 Note Q V + FR0 TIP 0. N00 V. INJ- V Q R IRFIZN R 0K R0 Note -/W 0-/W R Note 0K Q U R IXI0SI MMT0LT I_INJ 0-/W N N R R K-/W V fb_inj PWM0- Input Out 0.00-TO0 Q VSS V TIP Q0 MMT0LT PWM- Input Out N 0 R 0-/W Note INJ- V Q IRFIZN R0 -/W Note R 0-/W FR0 Q TIP 0 N Q MMT0LT Note I_INJ R 0.00-TO0 V Q TIP R 0-/W R K-/W Q MMT0LT fb_inj Note : urrent limit circuit for driver FT protection. lamp current set to ~ amps. ircuit can be omitted if protection is not required or desired - in this case install jumper in place of R and R Note : ctive flyback clamp circuit. If using avalanche-rated FTs for Q/Q then circuit can Megasquirt - Output Injector be omitted. lamp voltage equals zener avalanche voltage. Size ocument Number Rev Note : Flyback PWM damping circuit. urcuit can be omitted if PWM current limiting not used. Rev.M - SM. ate: Monday, February, 00 Sheet of
Note IG_Out IgbtIn Q VZVFI High-urrent Ignition river U SOUR RIN R FP Fuel-pump rive FP- INPUT RIN K SOUR RIN R Idle- IL Idle-ir Solenoid/Spare rive INPUT RIN K VNSNV0- RW N00 Megasquirt - Output Other Note : High-power ignition drive, optional circuit - populate only if implementing drive. Size ocument Number Rev Rev.M - SM. ate: Friday, February 0, 00 Sheet of
V V V for MSII Sanctioned V Stepper Volt Regulator S S N00 U F 0 Sanctioned V X_ LMT-.0 Polyfuse RX00 RW S VIN VOUT N00 + + 0.00 0. S. N00 V W MOV S.. RZ-V00 Perry V W GN.V W L Vsyn uh VSYN 0. R 0 GMXF- 0K.0.0 L uh + nalog R. OS- 0. OS- 00K R 0M PU lock Y. KHz 0 pf 0 pf Sanctioned Gnd SG SG. SG.. Megasquirt - Power Size ocument Number Rev Rev.M - SM. ate: Monday, February, 00 Sheet of
V R V R 0-/W Injector Pulse V R K-/W P R R Squirt- Q Q MMT0LT MMT0LT K Warmup- K L 0-/W Warm-up L V R K-/W P V R 0-/W V L R0 ccel K-/W P Shot P R ccel- Q MMT0LT K -PIN P P V MegaSquirt - L Indicators Size ocument Number Rev Rev.M - SM. ate: Monday, February, 00 Sheet of
V V Note : For MS-II implementation, the following connector signal jumpers are suggested: PU - onnector - escription ------------------------------------------------- JS0 - I - Stepper motor signal 0. U JS - I - Stepper motor signal P JS - I - Stepper motor signal + JS - I - Stepper motor signal JS0 - IGN - Ignition output V+ - TOUT 0. P + RIN - ROUT 0. -PIN P ONNTOR V- TIN P TX- 0. TOUT TIN 0 TS RX- RIN ROUT -PIN P MXI P RTS P MT LT TPS O P0 TachIn RW IL INJ- INJ- FP Spare Signals P SPR SPR SPR SPR P F Polyfuse RX00 I IG_Out P P P X_ V 0 -PIN P P ONNTOR 0 0 0 I Vdd GN I I P0 P P P P P P Megasquirt - onnector Size ocument Number Rev Rev.M - SM. ate: Monday, February, 00 Sheet of