AN2517 Freescale Semiconductor / Motorola, AN2517 Datasheet - Page 24

• Manufacturer Part Number: AN2517
• Description: 3-Phase Sine Wave Generator with Dead-Time Correction TPU Function Set
• Manufacturer: Freescale Semiconductor / Motorola

AN2517/D
Resolver Reference
Signal for 3-Phase
Sine Wave
Generator with
Dead-Time
Correction
(3SinDt_res)
Synchronized Change
of PWM Prescaler
And Resolver
Reference Signals
Prescaler
24
3-Phase Sine Wave Generator with Dead-Time Correction TPU Function Set (3SinDt) MOTOROLA
The 3SinDt_res TPU function uses information read from the 3SinDt PWM
functions, the actual PWM center times and the PWM periods. This allows a
signal to be generated, which tracks the changes of the PWM period and is
always synchronized with the PWM. The resolver reference signal is a 50%
duty-cycle signal with a period equal to prescaler or synchronization channel
presc_copy PWM periods (see next paragraph). The low to high transition of
the pulse can be adjusted by a parameter, either negative or positive, to go a
number of TCR1 TPU cycles before or after the PWM period center time.
The 3SinDt_res TPU function can inherit the Synchronization Signal prescaler
that is synchronously changed with the PWM prescaler. Write the
synchronization signals presc_copy parameter address to the presc_addr
parameter to enable this mechanism. Write 0 to disable it, and in this case set
the prescaler parameter to directly specify prescaler value.
move > 0
prescaler = 1
move < 0
prescaler = 2
Freescale Semiconductor, Inc.
For More Information On This Product,
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Figure 11. Resolver reference signal adjustment examples
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Go to: www.freescale.com
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