AN2517 Freescale Semiconductor / Motorola, AN2517 Datasheet - Page 3

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

Function Set Configuration
MOTOROLA 3-Phase Sine Wave Generator with Dead-Time Correction TPU Function Set (3SinDt)
None of the TPU functions in the 3-Phase Sine Wave Generator with Dead-
Time Correction TPU function set can be used separately. The 3SinDt_top and
3SinDt_bottom functions have to be used together. The 3SinDt_top is used on
3 channels, the 3SinDt_bottom on a further 3 channels, and within each phase,
the function 3SinDt_top has to be assigned on a lower TPU channel than the
function 3SinDt_bottom. This is illustrated in the examples in
Table
function values. The table is placed in the parameter space of four consecutive
channels. One or more channels running Synchronization Signal for 3SinDt as
well as Resolver Reference Signals for 3SinDt functions can be added to the
3SinDt_top and 3SinDt_bottom functions. They can run with different settings
on each channel. The function Fault Input for 3SinDt can also be added to the
3SinDt_top and 3SinDt_bottom functions. It is recommended to use it on
channel 15, and to set 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 3SinDt_fault can run on one
of the four channels where the table of cosine function values is placed,
because the 3SinDt_fault function does not have any parameters.
Table 1
3SinDt_top
3SinDt_bottom
Cosine table
3SinDt_sync
3SinDt_res
3SinDt_fault
Table 1. 3SinDt TPU function set configuration options and restrictions
TPU function
Freescale Semiconductor, Inc.
For More Information On This Product,
3. The 3SinDt_top and 3SinDt_bottom functions use a table of 32 cosine
shows the configuration options and restrictions.
Go to: www.freescale.com
Mandatory
mandatory
mandatory
mandatory
Optional/
optional
optional
optional
How many
channels
1 or more
1 or more
3
3
4
1
any 3 channels, within each phase a
any 3 channels, within each phase a
any 4 consecutive channels
any channels
any channels
any, recommended is 15 and DTPU bit
lower TPU channel then the same
phase 3SinDt_bottom
higher TPU channel then the same
phase 3SinDt_top
set
Assignable channels
Function Set Configuration
Table 2
and
AN2517/D
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