AN2514 Freescale Semiconductor / Motorola, AN2514 Datasheet - Page 2

• Manufacturer Part Number: AN2514
• Description: 3-Phase Sine Wave Generator TPU Function Set
• Manufacturer: Freescale Semiconductor / Motorola

AN2514/D
Function Set Configuration
2
be used to generate one or more adjustable signals for a wide range of uses,
that are synchronized to the PWM, and track changes in the PWM period. The
Resolver Reference Signal for the 3Sin function can be used to generate one
or more 50% duty-cycle adjustable signals that are also synchronized to the
PWM.The Fault Input for the 3Sin function is a TPU input function that sets all
PWM outputs low when the input signal goes low. See
None of the TPU functions in the 3-Phase Sine Wave Generator TPU function
set can be used separately. The 3Sin_top and 3Sin_bottom functions have to
be used together. The 3Sin_top is used on 3 channels, the 3Sin_bottom on a
further 3 channels, and within each phase, the function 3Sin_top has to be
assigned on a lower TPU channel than the function 3Sin_bottom. This is
illustrated in the examples in
3Sin_bottom functions use a table of 32 cosine function values. The table is
placed in the parameter space of four consecutive channels. One or more
channels running a Synchronization Signal for 3Sin as well as Resolver
Reference Signals for 3Sin functions can be added to the 3Sin_top and
3Sin_bottom functions. They can run with different settings on each channel.
The function Fault Input for 3Sin can also be added to the 3Sin_top and
3Sin_bottom functions. It is recommended to use it on channel 15, and to select
the hardware option that disables all TPU output pins when the channel 15
input signal is low (DTPU bit = 1). This ensures that the hardware reacts quickly
to a pin fault state. Note that it is not only the PWM channels, but all TPU output
channels, including the synchronization signals, that are disabled in this
configuration. The function 3Sin_fault can run on one of the four channels
where the table of cosine function values is placed, because the 3Sin_fault
function does not have any parameters.
Table 1
3-Phase Sine Wave Generator TPU Function Set (3Sin)
Freescale Semiconductor, Inc.
For More Information On This Product,
shows the configuration options and restrictions.
Go to: www.freescale.com
Table 2
and
Table
3. The 3Sin_top and
Figure
1.
MOTOROLA