Low Cost 32-bit Digital Signal Controller

28th June 2006

ES Admin

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Texas Instruments has added four low cost members to the TMS320F280xx digital signal controller series targeted at motor control, digital power conversion and intelligent sensor control applications. The new TMS320F28015 and F28016 controllers offer 60MHz of performance starting as low as $3.25 (in 1Ku quantities) while the new TMS320F2801-60 and F2802-60 controllers also offer 60 MHz of performance and are based on the current TMS320F2801 and F2802 devices.

TI also announced a new digital power development kit, which consists of a TMS320C2000T Digital Power Supply (DPS) software library and a series of hardware modules from Tier Electronics that provide off-the-shelf platforms that engineers can control with this software library.

As designers consider upgrading existing 8- or 16-bit microcontroller- based designs, TI's F280xx controllers offer a portfolio of eleven software and pin-for-pin compatible devices with 32-bit DSP performance combined with the peripheral integration and ease-of-use of an MCU. All F280x-based devices feature a 32-bit wide data path for superior performance and mixed 16/32-bit instruction set for improved code density. These controllers offer exceptional system integration by providing complete control system capabilities from signal input through the on-chip,12-bit analog to digital converter (ADC), quadrature encoder pulse (QEP) interfaces, and timer captures and compares through signal output with up to 10 independent pulse width modulation (PWM) channels. Depending on the device, communication interfaces include CAN, I2C, UARTand SPI ports.

All four new F280x devices feature a patent-pending pulse width modulator (PWM) with 150 picosecond (ps) resolution. The high resolution PWM (HRPWM) provides 16 bits of accuracy in a 100 KHz control loop and 12 bits at 1.5 MHz. As a result, power developers benefit from designs with cleaner power output, higher power density, smaller magnetics and more compact, cooler supplies. These benefits are critical in applications like AC/DC rectifiers that require high tolerances and faster transient response with small ripple amplitude. For motor control applications such white goods and automotive, designers can reduce overall system costs through integration and low device cost while
leveraging the 32-bit performance necessary to implement advanced control techniques like sensorless vector control of three-phase motors. Using processor-intensive senorless vector control can help developers to reduce the size and cost of a system's motors and power electronics required to meet their needs.