AN1931D Freescale Semiconductor / Motorola, AN1931D Datasheet - Page 3

• Manufacturer Part Number: AN1931D
• Description: 3-Phase PM Synchronous Motor Vector Control
• Manufacturer: Freescale Semiconductor / Motorola

MOTOROLA
The PWM has the following features:
The PM synchronous motor control utilizes the PWM block set in the complementary PWM mode,
permitting generation of control signals for all switches of the power stage with inserted deadtime. The
PWM block generates three sinewave outputs mutually shifted by 120 degrees.
The Analog-to-Digital Converter (ADC) consists of a digital control module and two analog sample
and hold (S/H) circuits. ADC features:
The application utilizes the ADC block in simultaneous mode and sequential scan. It is synchronized
with PWM pulses. This configuration allows the simultaneous conversion within the required time of
required analog values, of all phase currents, voltage and temperature.
The Quadrature Timer is an extremely flexible module, providing all required services relating to time
events. It has the following features:
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Three complementary PWM signal pairs, or 6 independent PWM signals
Features of complementary channel operation
Deadtime insertion
Separate top and bottom pulse width correction via current status inputs or software
Separate top and bottom polarity control
Edge-aligned or center-aligned PWM signals
15 bits of resolution
Half-cycle reload capability
Integral reload rates from 1 to 16
Individual software-controlled PWM outputs
Mask and swap of PWM outputs
Programmable fault protection
Polarity control
20mA current sink capability on PWM pins
Write-protectable registers
12-bit resolution
Maximum ADC clock frequency is 5MHz with 200ns period
Single conversion time of 8.5 ADC clock cycles (8.5 x 200 ns = 1.7 s)
Additional conversion time of 6 ADC clock cycles (6 x 200 ns = 1.2 s)
Eight conversions in 26.5 ADC clock cycles (26.5 x 200 ns = 5.3 s) using simultaneous mode
ADC can be synchronized to the PWM via the sync signal
Simultaneous or sequential sampling
Internal multiplexer to select 2 of 8 inputs
Ability to sequentially scan and store up to 8 measurements
Ability to simultaneously sample and hold 2 inputs
Optional interrupts at end of scan, if an out-of-range limit is exceeded, or at zero crossing
Optional sample correction by subtracting a preprogrammed offset value
Signed or unsigned result
Single-ended or differential inputs
Freescale Semiconductor, Inc.
3-Phase PM Synchronous Motor Vector Control
For More Information On This Product,
Go to: www.freescale.com
Motorola DSP Advantages and Features
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