AN2527 Freescale Semiconductor / Motorola, AN2527 Datasheet - Page 3

• Manufacturer Part Number: AN2527
• Description: DC Motor with Dead-Time Correction - XOR version TPU Function Set
• Manufacturer: Freescale Semiconductor / Motorola

Function Set Configuration
MOTOROLA DC Motor with Dead-Time Correction – XOR version TPU Function Set (DCmDtXor)
The function set consists of 5 TPU functions:
The DCmDtXor TPU function set drives a DC Motor, independently of the CPU.
The CPU is required only to set a duty-cycle (dc) parameter in the range (–1,1).
This determines both the speed and the direction. The function generates
unipolar-switched center-aligned PWM signals.
The DCmDtXor_C and DCmDtXor_T TPU functions work together to generate
4 pairs of XOR gate inputs. The XOR gate outputs then produce a 4-channel
2-phase center-aligned PWM signal with dead-time between the top and
bottom channels. The Synchronization Signal for the DCmDtXor function can
be used to generate one or more adjustable signals for a wide range of uses.
These are synchronized to the PWM, and track changes in the PWM period.
The Resolver Reference Signal for the DCmDtXor 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 DCmDtXor function is a TPU
input function that sets all PWM outputs low when the input signal goes low.
None of the TPU functions in the DC Motor with Dead-Time Correction – XOR
version TPU function set can be used separately. The DCmDtXor_C and
DCmDtXor_T functions have to be used together. The DCmDtXor_C runs on
pins SW1_1 and SW3_1 – see
pins. One or more channels running Synchronization Signal for DCmDtXor as
well as Resolver Reference Signals for DCmDtXor functions can be added.
They can run with different settings on each channel. The function Fault Input
for DCmDtXor can also be added. 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.
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Freescale Semiconductor, Inc.
For More Information On This Product,
DC Motor with Dead-Time Correction – XOR version – C channels
(DCmDtXor_C)
DC Motor with Dead-Time Correction – XOR version – T channels
(DCmDtXor_T)
Synchronization Signal for DC Motor with Dead-Time Correction – XOR
version (DCmDtXor_sync)
Resolver Reference Signal for DC Motor with Dead-Time Correction –
XOR version (DCmDtXor_res)
Fault Input for DC Motor with Dead-Time Correction – XOR version
(DCmDtXor_fault)
Go to: www.freescale.com
Figure
1. The DCmDtXor_T runs on the other
Function Set Configuration
AN2527/D
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