Engine control modules are sophisticated systems that require diagnostics and specialized control functions to monitor environmental inputs and control complex loads while operating in harsh automotive environments. Managing the complexities of engine control can be accomplished reliably and efficiently using Freescale's analog products.
Freescale's growing portfolio of analog products for high-current powertrain applications includes output drivers, signal monitoring and conditioning devices, and H-bridges. These products can be mixed and matched with Freescale's complementary MPC55xx 32-bit microcontrollers (MCUs), providing the flexibility to support a wide variety of multi-cylinder engine control applications. Built on Power Architecture(TM) technology, MPC55xx MCUs are fully synthesizable system-on-chip (SoC) devices optimized for automotive applications, including powertrain control.
"Engine control complexity will continue to increase as next-generation systems are developed to meet tighter future emissions legislation limits," said Chris Webber, vice president of Strategy Analytics Automotive Practice. "Mixed-signal interfacing between sensors and actuators and the engine MCU accounts for a significant amount of the circuit design complexity and cost. To control costs while delivering enhanced performance, electronic module engineers are looking for higher levels of design flexibility and feature integration within standard IC products."
For more than 25 years, Freescale has provided technology leadership in analog, mixed-signal and power products for the automotive market. Freescale's SMARTMOS technology combines high-density, high-speed logic with precision analog and high-voltage, high-current power circuitry. Using the serial peripheral interface (SPI) communications protocol, SMARTMOS devices work seamlessly with Freescale's industry-leading automotive MCU families.
"Freescale's high-performance analog and mixed-signal products are engineered to provide reliable, efficient solutions to address the complexities of engine control," said Arman Naghavi, vice president and general manager of Freescale's Analog, Mixed-Signal and Power Division. "Our continued innovation in highly integrated analog products manufactured on our advanced SMARTMOS technology is enabling automotive designers to reduce power consumption, board space and system cost."
A demonstration of an engine control solution based on some of the following Freescale analog devices will be on display at the Freescale Technology Forum (FTF) Tech Lab in Orlando, Florida, June 25-28.
The MC33800 is a 16-channel, multifunction output driver featuring eight low-side drivers, six field-effect transistor (FET) pre-drivers and two constant current low-side drivers. A "Swiss Army knife" of MCU interfaces, the MC33800 is designed to control relays, motors, solenoids, lamps, valves and heated exhaust gas oxygen (HEGO) sensors. While ideal for engine and transmission control, the device is also well-suited for many other applications, such as electronic power steering, four-wheel drive control, and industrial and commercial control systems requiring low-side drivers with diagnostic reporting and fault protection.
The MC33810 low-side driver provides a versatile, programmable interface between the engine control MCU and the spark ignition and fuel injection functions of a gasoline engine. Applications include automobiles, motorcycles, industrial engines, generators, marine craft and other recreational vehicles. The MC33810 is one of the first flexible engine control interface circuits that scales easily for various numbers of engine cylinders. The device integrates four low-side drivers and four PWM-capable pre-drivers that can be configured to drive fuel injectors, solenoids, external FETs or IGBTs. The MC33810 significantly reduces the number of components in an engine control unit, reducing its size, cost and complexity.
Signal Monitoring and Conditioning
The MC33811 is a five-channel solenoid monitoring device used to determine the correct operation of a solenoid. The device determines whether there is a problem with a solenoid opening and closing by monitoring the profile of the solenoid's current waveform. A simple SPI message tells the MCU if the solenoid actuation has been successful or if a fault has occurred. Applications include automatic transmissions, fuel injectors and other control valve actuators.
The MC33975 is an enhanced interface IC designed to detect the state of 22 switch inputs: 14 switch inputs to ground and eight switch inputs for contacts to ground or to battery. All 22 inputs can be configured as analog signal inputs multiplexed and buffered for use by off-chip circuitry. A member of Freescale's Multiple Switch Detection Interface family, the MC33975 can connect to any SPI-enabled MCU, providing a protected switch-level interface and an analog input signal capability. The device has been enhanced to provide 32 mA of current per output to switched 5V sensors, as well as input sensing. The MC33975 also can be used in automotive body control modules and in industrial and commercial control systems.
The MC33899 and MC33926 devices are monolithic H-bridge power ICs designed for electronic throttle control and low-voltage DC servo motor control applications. The devices can drive DC motors or bi-directional solenoid-controlled actuators, such as throttle control or exhaust gas recirculation actuators. They also provide robust solutions for harsh powertrain environments in a compact, easy-to-use package.
The MC33899 features a SPI interface to the system MCU to enable advanced diagnostics, programmable current limit and a selectable slew rate. It also offers a higher output current than the MC33926. A fault restart feature allows the MC33899 to be configured to regulate high load currents below the programmed current limit.
The MC33926 offers a simple input control to enable precise load management without a SPI interface. The device's rich feature set is a subset of the broad programmability of the MC33899. The MC33926 also has a smaller footprint package than the MC33899. This thermally enhanced compact PQFN package makes the MC33926 an ideal solution for small-footprint engine controllers.
Pricing and Availability
Freescale's analog SMARTMOS devices for engine control are sampling upon request. These devices are supported by evaluation boards and a USB to SPI interface board. The KITUSBSPIEVME board enables a PC without a parallel port to communicate with other Freescale evaluation boards via a USB port. Suggested resale pricing for the KITUSBSPIEVME is $65 (USD).
Suggested per-unit resale pricing (USD) in 10,000-piece quantities:
-- MC33800 16-channel output driver at $2.40
-- MC33810 eight channel ignition and injector driver at $2.28
-- MC33811 five-channel solenoid monitor at $1.20
-- MC33899 programmable H-bridge motor driver at $3.29
-- MC33926 throttle control H-bridge at $2.03
-- MC33975 22-channel multiple switch detection interface at $1.91
For more information on these analog products, including development tool availability, visit www.freescale.com/files/pr/enginecontrol.html.
About Freescale Semiconductor
Freescale Semiconductor is a global leader in the design and manufacture of embedded semiconductors for the automotive, consumer, industrial, networking and wireless markets. The privately held company is based in Austin, Texas, and has design, research and development, manufacturing or sales operations in more than 30 countries. Freescale is one of the world's largest semiconductor companies with 2006 sales of $6.4 billion (USD). www.freescale.com
Freescale Technology Forum
The Freescale Technology Forum (FTF) has become the developer event of the year for the embedded semiconductor industry. The Forum, which debuted in 2005, has been enthusiastically received by the global developer community, drawing more than 12,000 attendees at FTF events worldwide since its inception. For more information about FTF events, please go to www.freescale.com/ftf.
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