Texas Instruments controlCARD with Piccolo TMS320F28027FPTT, InstaSPIN™-FOC enabled TMDSCNCD28027F TMDSCNCD28027F Datenbogen

Produktcode

TMDSCNCD28027F

Clock

Prescale

TBPRD

SYSCLKOUT

TBCLK

EPWMxSOCA

/ETPS

ADC

PWM

FREQ

/ISRvsCTRL

ISR

/CTRLvsEST

/CTRLvsCURRENT

/CTRLvsSPEED

/CTRLvsTRAJ

CTRL

EST

CURRENT

SPEED

TRAJ

Software Decimation

Hardware Decimation

www.ti.com

Microcontroller Resources

InstaSPIN-FOC provides flexibility throughout its design, including its software execution clock tree.

Figure 5

illustrates the options available to the designer to manage the real-time scheduling of each of the

major software functions. Balancing motor performance with CPU loading is not difficult, shortening
system integration time.

Figure 5. Software Execution Clock Tree Provides Flexibility with Real-Time Scheduling

Executing from a combination of single-cycle memory (RAM and ROM) and also from FLASH, total
execution time for the minimum full implementation of InstaSPIN-FOC depends on the software execution
clock tree.

Table 2

shows the CPU cycles used when a minimum full implementation of InstaSPIN is done,

as well as users' code is loaded to FLASH. Note the impact of the software execution tree to total
execution time.

Table 3

shows the CPU loading and available MIPs for other system functions.

Table 2. CPU Cycles for MIN Implementation Executing from ROM, RAM, and FLASH

CPU Cycles

Executed From

Function Name

Min

Average

Max

ROM

RAM

FLASH

DRV_acqAdcInt

✓

DRV_readAdcData

✓

SPRUHP4 – August 2013

TMS320F28026F, TMS320F28027F InstaSPIN™-FOC Software

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