“Their capabilities, including high-speed sensor-less field-oriented control, high-torque zero-speed start-up and vibration compensation, deliver responsive motor control for everyday applications,” claimed the company.
The parts are F28E120SC and F28E120SB, differing only in flash memory size: either 128kbyte (64kword) or 64kbyte respectively, in a single bank with error-correction. Both have 16kbyte (8kword) of parity-protected ram.
Computation comes from one of TI’s C28x 32bit DSP cores running at 160MHz, which it claims is equivalent to a 320MHz Arm Cortex-M7 for real-time signal chain performance – fixed-point code can run out of on-chip flash or on-chip ram.
The DSP is backed up by a floating point unit.
Analogue peripherals include a 9.4Msample/s 12bit ADC without simultaneous multi-channel sampling, but with triple post-processing blocks that can implement saturating offset calibration; error from setpoint calculation; high, low and zero-crossing compare (with interrupt and PWM trip capability); and 24bit accumulation for over-sampling (with configurable binary shift).
There is also a programmable gain amplifier with its own input multiplexer.
On the output side, there are two PWM modules, one six-channel and one two-channel.
Sensor-less field-oriented control can be executed up to 120,000rpm (2kHz electrical), according to the company, which offers its own algorithms branded ‘InstaSPIN’.
“The MCUs can also run a vibration compensation algorithm, counteracting acoustic noise and vibrations caused by an imbalanced load in applications such as washing machines,” said TI.
Basic security functions are included.
Package options are 32 or 48pin LQFP, or 32pad thin QFN, and operation is in ambients across -40 to +105°C (up to 125°C Tj).
Pre-production quantities are available now.
A low-cost evaluation module is being prepared, and F28E120SC demonstrations can be seen at Electronica India in Bangalore this week (17 – 19 Sept, stand D11 in hall 3):
- Controlling a high-voltage three-phase fan motor with a total harmonic distortion reduction algorithm to reduce acoustic noise.
- Sensor-less field-oriented control for a 150,000rpm low-voltage vacuum cleaner motor.
Find the data sheet on this TI web link, which needs to be read with the more comprehensive ‘technical reference manual‘
