AN2524 Freescale Semiconductor / Motorola, AN2524 Datasheet - Page 3

• Manufacturer Part Number: AN2524
• Description: DC Motor with Dead-Time Correction TPU Function Set
• Manufacturer: Freescale Semiconductor / Motorola

Function Set Configuration
MOTOROLA
DC Motor with Dead-Time Correction TPU Function Set (DCmDt)
The DC Motor with Dead-Time Correction TPU function drives a DC Motor,
independently of the CPU. The CPU is required only to set the instantaneous
direction of the motor current, and a duty-cycle (dc) parameter in the range
(–1,1). The duty-cycle determines both the motor speed, and direction. The
function generates unipolar-switched center-aligned PWM signals.
The function set consists of 4 TPU functions:
The DCmDt TPU function generates a 4-channel 2-phase center-aligned PWM
signal with dead-time between the top and bottom channels. The
Synchronization Signal for the DCmDt function can be used to generate one or
more adjustable signals for a wide range of uses. These signals are
synchronized to the PWM, and track changes in the PWM period. The Resolver
Reference Signal for the DCmDt 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 DCmDt function is a TPU input function that sets all PWM
outputs low when the input signal goes low. See
The DCmDt function has to be used on 4 output channels, and within each
phase, the top channel has to be assigned on a lower TPU channel than the
bottom channel. One or more channels running Synchronization Signal for
DCmDt as well as Resolver Reference Signals for DCmDt functions can be
added. They can run with different settings on each channel. The function Fault
Input for DCmDt 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 (DCmDt)
Synchronization Signal for DC Motor with Dead-Time Correction
(DCmDt_sync)
Resolver Reference Signal for DC Motor with Dead-Time Correction
(DCmDt_res)
Fault Input for DC Motor with Dead-Time Correction (DCmDt_fault)
Go to: www.freescale.com
Figure
1.
Function Set Configuration
AN2524/D
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