56F8355 datasheet(9/164 Pages) FREESCALE

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Award-Winning Development Environment

56F8355 Technical Data, Rev. 12

Freescale Semiconductor

Preliminary

synchronous pulse width control (0% to 100% modulation) is supported. The device is capable of

controlling most motor types: ACIM (AC Induction Motors); both BDC and BLDC (Brush and Brushless

DC motors); SRM and VRM (Switched and Variable Reluctance Motors); and stepper motors. The PWM

incorporates fault protection and cycle-by-cycle current limiting with sufficient output drive capability to

directly drive standard optoisolators. A “smoke-inhibit”, write-once protection feature for key parameters

is also included. A patented PWM waveform distortion correction circuit is also provided. The PWM is

double-buffered and includes interrupt controls to permit integral reload rates to be programmable from 1

to 16. The PWM module provides reference outputs to synchronize the Analog-to-Digital Converters

through two channels of Quad Timer C.

The 56F8155 incorporates a Quadrature Decoder capable of capturing all four transitions on the two-phase

inputs, permitting generation of a number proportional to actual position. Speed computation capabilities

accommodate both fast- and slow-moving shafts. An integrated watchdog timer in the Quadrature Decoder

can be programmed with a time-out value to alert when no shaft motion is detected. Each input is filtered

to ensure only true transitions are recorded.

This controller also provides a full set of standard programmable peripherals that include two Serial

Communications Interfaces (SCIs); two Serial Peripheral Interfaces (SPIs); and two Quad Timers. Any of

these interfaces can be used as General Purpose Input/Outputs (GPIOs) if that function is not required. An

internal interrupt controller is also a part of the 56F8155.

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56F8355 Datenblatt(PDF) 9 Page - Freescale Semiconductor, Inc