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Introducing M221

The M221 is a Smart Injector Driver Module designed to support alternate fuel management controllers (e.g. CNG/LPG conversion) and specialty engine controllers.

Pi Innovo OpenECU M221


  • Up to 10 x 4A Peak / 1A Hold injectors
  • Capable of handling multuple injectors per stroke
  • Capable of injection signal intercept and modification
  • Capable of current and voltage monitors on many output channels
  • Capable of thermal trip monitors on certain channels
  • Wide range of automotive sensors and actuators
  • Supports multi-cylinder engines
  • Configurable analog and digital I/O
  • High speed CAN channels
  • Supported platform software using OpenECU: Release 2.8.0

Hardware Specifications

Processor MPC5534
Clock Rate 80MHz
Code Space up to 768KB
RAM Space up to 832KB
Calibration Space up to 256KB
Sensor Supplies 1x 5V@250mA
Input Pins 22
Output Pins 15
Communications 2x CAN 2.0
Digital, Frequency, PWM 14
Crank Shaft (VR/Hall differential) 1
Low side GP, Injector (SM, VM, CM) 10 x 4A Peak/ 1A Hold
Dimensions (mm) 155 x 115 x 39
Material Aluminum
Weight 1.0kg (est)
Connectors 1 x 46 pin
Vibration 6g random RMS
Environmental Protection IP67 Sealed / Gore Vent
Location Engine Compartment/ Chassis
Supply Voltage (normal operation) 12-24V


M221 Applications Include:

  • CNG / LPG Injector Driver Module




This is a default configuration, optional configuration available, please contact us.
For a full list of downloads click here.



Custom Injector Drive Module for Propane Autogas Injectors



What Pi Supported

An existing customer of Pi Innovo was looking for an automotive grade fuel injector driver module capable of driving up to 10 LPG injectors.  This customer currently uses a variant of the M220 OpenECU low cost embedded controller to control their LPG tank system.  Working in partnership with our customer’s engineering team, it was determined the injector drive functionality could be incorporated as a customized variant of an existing low cost M220 rapid controls prototyping OpenECU.  Due to the addition of 10 injector driver circuits, a full board spin was required resulting in the creation of the M221.   All the required LPG tank control functionality was maintained while adding the injector drive capability resulting in a compact, cost effective custom solution.

In this case, Pi Innovo was contracted to design, develop, validate and supply the module while our customer’s engineering team used the OpenECU embedded controls development platform to develop the control software.


All required LPG tank control functionality was maintained while adding the injector drive capability resulting in a compact, cost effective custom controller design. The customer is now using a content-reduced custom variant of the M220 OpenECU to control their LPG tank system.

Alternative Fuel System Control: CNG, LNG, LPG




Pi Innovo was required to design and develop low cost embedded control solutions to meet several different customer’s unique I/O requirements for CNG, LNG and LPG fuel systems.


Variants of the M220 OpenECU rapid controls prototyping ECU were used in LNG, CNG, and LPG applications for fuel injection, high pressure tank control and fuel system monitoring / control. The availability of a highly configurable auxiliary I/O on the M220 allowed the controller to be used to monitor system temperatures and pressures, as well as driving motors and injector solenoids. An advanced microprocessor also enables model based advanced control functionality to be developed to help improve system efficiency. Injection commands from the stock engine controller were interrupted, and modified commands were then sent to the alternative fuel injectors.   In some cases, this happened in the same combustion cycle. Signals were also sent back to the stock engine controller to ensure that existing diagnostic routines did not incorrectly raise faults due to the different injection profile of the new fuel.

Depending on the I/O needs, cost optimized custom variants have been created for volume production.   For companies needing engineering support, Pi Innovo developed the application in addition to supplying the production hardware.  In most cases, Pi Innovo supplied the OpenECU rapid prototyping platform with Simulink model based controls developer platform and the customer developed the application.


Using OpenECU has enabled several companies to reliably, cost-effectively and quickly introduce alternative fuel systems to the market.   Thousands of Pi Innovo’s M220 OpenECU are being used on the road in alternative fuel vehicle systems today.

Project Features
  • Rapid controls prototyping
  • Model based development
  • Natural gas vehicle control
  • Production solution
  • Hardware flexibility
  • Application ownership and IP protection



Compare ALL OpenECU Modules

Primary Processor SPC5534 SPC5746B MPC5534 MPC5534 MPC5534 MPC5674F MPC5746B SPC5746 SPC5746
Primary Clock Rate 80MHz 80MHz 80MHz 80MHz 80MHz 264MHz 160MHz 160MHz 160MHz
Primary Code Space 512KB 3MB 768KB 768KB 512KB 3MB 2302KB 3MB 3MB
Primary RAM Space 64KB 256kB 832KB 832KB 64KB 128kB 384KB 256KB 256KB
Primary Calibration Space 256KB 256kB 236KB 256KB 256KB 128kB 128KB 256KB 256KB
Secondary Processor SPC560P34 SPC560P34 SPC560P34
Secondary Clock Rate 64MHz 64MHz 64MHz
Secondary Flash Space 192KB 192KB 192KB
Secondary Calibration Space 20KB
Secondary RAM Space 12KB 12KB
Operating Voltage 9V to 32V 8V to 32V 7V to 32 V 7V to 32 V 12V or 24V 8V to 18V 8V to 18V 8V to 18V
Sensor Supply 1x 5V @250mA 1x 1 x 5V / 250mA 1 x 5V / 250mA 2x 5V@250mA 4x 250mA @ 5V none 2x 5V @200mA 2x 5V @200mA
Standby Current 0.25mA @12V 0.25mA @ 12V
Actuator Supplies 1x 20A 2x 10A @ Vbatt
Output Protection Short to Battery, Ground
Battery Input Protection Overvoltage, Reverse Voltage
Survive Voltage -28V to 36V
High Speed CAN 2.0 2x 4x 2x 2x 2x 4x 1x 4x 4x
LIN (master)2 2x
Inputs (Analog or Digital) 10x 6x 9x 16x 18x (Digital: 6x; Analog: 12x) 40x (Digital: 5x switched, 3x Frequency, PWM; Analog: 32) 4x 40x (Digital: 9x switched, 3x PWM; Analog: 28) 44x (Digital: 9x switched, 3x PWM; Analog: 32)
Reprogramming Enable (FEPS) 1x @ -18V 1x @ -18V 1x @ -18V 1x @ -18V 1x @ -18V 4x
Differential VRS 1x (2 pins)
Single Ended VRS 2x
Frequency 1x
Cam Shaft 2x ±157V 4x Hall only
Crank Shaft 1x ±157V 1x Hall (VR option)
RTD Sensor 7x 4x
Knock Sensor Knock Sensor
Lamda Sensor (UEGO) 2x
Lamda Sensor (HEGO) 4x (only 2x available when using 2x UEGO)
Ignition Sense 1x 1x 1x
Low Current Low Side Drives Up to 1x 20mA & 2x 100mA & 6x 500mA Up to 6x 500mA LSD 12x 100mA, 3x 400mA, 14x 700mA, 2x 1A 11x 100mA, 4x 400mA, 14x 700mA, 2x 1A
Medium Current Low Side Drives Up to 4x 2A Up to 4x 2A LSD
High Current Low Side Drives 4x 2.2A, 1x 3.2A 4x 2.2A, 1x 3.2A
0-5 V Analog Output Up to 2x 10mA Up to 2x 10mA
PWM Low Side 2x 100mA 2x 100mA, 2x 250mA & 6x 2A
H-Bridge 1x 5A 2x 8A 1x 5A full-bridge & 2x 10A full-bridge or 4x 10A half-bridge 2x 50A peak or 10A 1x 10A, 2x 5A, 1x 3.2A 1x 10A, 2x 5A, 1x 3.2A
High Side Switch 1x 15A 1x Hall (VR option)
Low Side Injector 1x 15A or 5A 3x 5A peak/ 2A hold 8x software-programmable waveform peak-and-hold: nominal 25A peak, 15A hold
Current Monitors 2x
Voltage Monitors 2x
High Side Logic Outputs 2x 1mA 2x 1mA
High Side Outputs 4x 700mA 4x 700mA
Low Side General Purpose, PWM (SM, VM, CTM) 1x 10A, 1x 2A, 1x 500mA 9x 0.2/0.5A lamp & relay, with monitoring of state, voltage, and fault status
Low-side General Purpose, Spark (SM) 1x 8A 8x (Smart Coil only) with monitoring of state; on-off mode for non-spark uses
High-side Injector sources 2x Injector High-Side outputs with programmable boost voltage phase, 25A peak
Low side GP (General Purpose) (VM, CTM) 1x 8A, 2x 6A peak / 4A hold, with voltage and current-tripped monitoring
High-side GP (General Purpose) (CM) 2x 8A up to 85°C, intended for source to low-side outputs, with current monitoring
Constant-Current (with inductive actuator) 8x 2A
Vibration ISO 16750-3 ISO 16750-3 6g random RMS 6g random RMS Ford IIIB - Severe ISO 16750-3 IEC 60068-2-64 ISO 16750 chassis mount ISO 16750 chassis mount
Environmental Protection IP67 - Sealed IP67 – sealed IP67 IP69K IP67 Sealed/Gore vent IP69K IP69K & IPx8 Sealed/Gore vent IP69K Sealed/Gore Vent IP69K Sealed/Gore Vent
ESD ±8kV - SAE J1113-13 SAE J1113-13
Conducted and Radiated Emissions CISPR25 Class 2 CISPR25 Class 2
Conducted Transients ISO 7637-2 ISO 7637-2
Bulk Current Injection Immunity ISO 11452-4 ISO 11452-4
Material Plastic (PPA GF33) PPA GF33 Aluminum Aluminum Aluminum Aluminum Aluminum Aluminum Aluminum
Dimension in mm (W x H x D) 138 x 130 x 42 138 x 130 x 42 mm (L x W x H) 155 x 115 x 46 155 x 115 x 39 228 x 158 x 50 266 x 299 x 56.5 207 x 104 x 45 225 x 205 x 45 225 x 205 x 45
Weight 520g 520g 1.02 kg 2.5 kg 540g 1.1 kg 1.1 kg
Connectors 2 x 20 pin (Molex MX-150) 2 x 20 pin (Molex MX-150) 46 pin 46 pin 46 pin Molex CMC 154-pin, 3-pocket 1x 23 TE (AMSEAL) Molex 112pin (1x 48, 2x 32) Molex 112pin (1x 48, 2x 32)
Location Chassis mount Chassis mount Chassis mount Engine Compartment/ Chassis Engine Compartment / Chassis Passenger Compartment Chassis/Passenger Compartment Chassis/Passenger Compartment
Operating Temperature ISO 16750-4 (-40°C to 85°C) -40°C to 85°C -40°C to 85°C -40°C to 85°C -40°C to 85°C -40°C to 85°C -40°C to 85°C -40°C to 85°C -40°C to 85°C
Program Status LED drive 1x
Reprogramming Enable In 1x @18V