AN2518 Freescale Semiconductor / Motorola, AN2518 Datasheet - Page 2

• Manufacturer Part Number: AN2518
• Description: 3-Phase Sine Wave Generator - 3 outputs version - XOR version TPU Function Set
• Manufacturer: Freescale Semiconductor / Motorola

AN2518/D
Function Set Configuration
2
3-Phase Sine Wave Generator – 3 outputs version – XOR version TPU Function Set (3Sin3Xor)
The 3Sin3Xor TPU function generates 3 pairs of XOR gate inputs. The XOR
gate outputs then produce a 3-channel 3-phase center-aligned PWM signal.
The generated signals control external hardware, which outputs a pair of
transistor signals (top and bottom) with dead-time inserted. The
Synchronization Signal for the 3Sin3Xor function can be used to generate one
or more adjustable signals for a wide range of uses, which are synchronized to
the PWM, and track changes in the PWM period. The Resolver Reference
Signal for the 3Sin3Xor 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 3Sin3Xor function is a TPU input function that sets all XOR gate
outputs low when the input signal goes low.
None of the TPU functions in the 3-Phase Sine Wave Generator – 3 outputs
version – XOR version TPU function set can be used separately. The
3Sin3Xor_R and 3Sin3Xor_T functions have to be used together. The
3Sin3Xor_R runs on pins A1, B1, C1, the 3Sin3Xor_T runs on pins A2, B2, C2
– see
cosine function values. The table is placed in the parameter space of four
consecutive channels. One or more channels running Synchronization Signal
for 3Sin3Xor as well as Resolver Reference Signals for 3Sin3Xor functions can
be added to the 3Sin3Xor_R and 3Sin3Xor_T functions. They can run with
different settings on each channel. The function Fault Input for 3Sin3Xor can
also be added to the 3Sin3Xor_R and 3Sin3Xor_T 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 3Sin3Xor_R and 3Sin3Xor_T channels, but all TPU output
channels, including the synchronization and resolver reference signals, that are
disabled in this configuration. The function 3Sin3Xor_fault can run on one of
the four channels where the table of cosine function values is placed, because
the 3Sin3_fault function does not have any parameters.
Table 1
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Freescale Semiconductor, Inc.
For More Information On This Product,
Figure
Resolver Reference Signal for 3-Phase Sine Wave Generator – 3
outputs version – XOR version (3Sin3Xor_res)
Fault Input for 3-Phase Sine Wave Generator – 3 outputs version – XOR
version (3Sin3Xor_fault)
shows the configuration options and restrictions.
Go to: www.freescale.com
1. The 3Sin3Xor_R and 3Sin3Xor_T functions use a table of 32
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