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參數(shù)資料
| 型號： | AN2933 |
| 英文描述： | Understanding the eTPU Channel Hardware |
| 中文描述： | 理解硬件頻道的eTPU |
| 文件頁數(shù)： | 31/40頁 |
| 文件大小： | 741K |
| 代理商： | AN2933 |
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Using the Channel Hardware
Understanding the eTPU Channel Hardware, Rev. 0
Freescale Semiconductor
31
with the output match function of an eTPU channel, and use the input side of the same channel for an
unrelated function.
4.1.5
Interactive Pin Actions
The eTPU channel structure provides output pin actions that are directly keyed to input pin states,
providing interaction without software delay. These OPAC states may be useful to provide safety cutoff of
an output drive when a feedback signal is found to be at an incorrect state a certain time after the drive is
applied.
In
Figure 7
, the output pin drives a load through a high side driver transistor. When the gate voltage is
applied, the load voltage will be low for a time due to the turn on delay of the transistor. After a short time,
if the load is healthy, the voltage is expected to go high. If the channel input pin is connected to the load,
it can be sampled after a short delay and the channel output can be turned off if the load voltage is not high,
indicating a possible shorted load. Once the software is set up, the programming of the load drive is simple,
as can be seen in Example
7
.
Figure 7. Load Sense
eTPU Channel Z
ChZ
out
ChZ
in
Match A
Match B
Channel Z Input signal
Channel Z Output signal
output short
Load
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