Delfino microcontroller simplifies resolver-to-digital design in motor control

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By eeNews Europe

The high-performance, floating-point C2000 Delfino microcontrollers integrate an on-chip, high-precision analog-to-digital converter, along with an external low-cost signal conditioning circuit, provide motor control designers an alternative to more expensive and complex semiconductor solutions.

Both resolvers and encoders are used in typical precision servo motor control systems, such as industrial drives and automotive power steering and traction control. Resolvers and encoders provide shaft position feedback to the control unit, but resolvers are highly accurate and noise immune, proving more robust and rugged than encoders. However, resolvers require a special precision resolver-to-digital converter to interface to a digital control system. These converters add complexity and cost to the motor control solution. Delfino microcontrollers can duplicate this functionality of producing the excitation signal and sampling and processing the feedback to obtain the angular reading as part of the motor control algorithms executed by these devices without the need for a dedicated resolver-to-digital converter, allowing advanced torque, speed and position control to be achieved with even greater accuracy. In addition, optimized Delfino microcontroller resolver software to ease development is available for free.

The 300 MHz C28x core provides fast interrupt response, minimal latency, execution of complex control algorithms and real-time data analysis while a 32bit floating-point unit eases programming of magnitude calculations, eliminates scaling and saturation burden and improves performance of algorithms such as Park transforms and proportional integral derivatives (PID).

There is up to 516 KB of on-chip, single-cycle access RAM enables high-speed program execution and data access alongside a 65ps flexible, high-resolution pulse-width modulators (PWMs) allow for optimal precision. CAN, I2C, SPI and standard serial interface (SCI) peripherals enable easy connectivity for management of system communication. An internal 12-bit, 12.5 MSPS ADC and the option for an external ADC with the analog-to-digital converter (ADC) interface give developers flexibility to use the on-board ADC or select from TI’s portfolio of high-accuracy ADCs.

Code compatibility across the C2000 platform enables developers to easily scale product lines and reuse code in controllers ranging from 40 MHz Piccolo microcontrollers to the 300 MHz Delfino microcontrollers.

Delfino microcontrollers start at $8.95 in quantities of 1,000 units. Customers can prototype and develop through a variety of tools, including the DIM100 F28335 controlCARD (TMDSCNCD28335) for $69, DIM100 C28243 controlCARD (TMDSCNCD28343) for $109 USD and DIM168 C28346 controlCARD TMDSCNCD28346-168 for $125. controlCARDs are modular daughtercards designed to plug in to TI’s portfolio of evaluation and application boards. The DM100 F28335 Experimenter’s Kit (TMDSDOCK28335) is available for $99. The C2843 Experimenter’s Kit (TMDSDOCK28343) is available for $159, and the C28346 Experimenter’s Kit (TMDSDOCK28346-168) is available for $189. A Peripheral Explorer Kit (TMDSPREX28335) is available for $179. TI also offers a variety of C2000 motor control kits compatible with Delfino microcontrollers.


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