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| 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)： | 33/40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
33
In another example, the eTPU might be applied to drive an inductive solenoid, perhaps a valve, as in the
circuit in
Figure 8
. When the load is turned on, the current will build according to the L/R time constant.
If the load is shorted, current will build instantly and perhaps be limited only by a small current sense
resistor. Continued application of the drive may damage the output transistor.
Figure 8. Driving an Inductive Load
In the circuit, we can feed back the current sense to the input pin of the eTPU channel that drives the output.
The channel hardware can be used to provide the required circuit protection.
Example 8.
/* The following drives an output inductive load and tests for shorts */
/* ... */
/* ... In the setup routine... */
EitherMatchNonBlockingSingleTransition() //
TimeBaseBMatchTcr1CaptureTcr1GreaterEqual()
OnMatchBPinHigh() // OPACB - Main Drive Signal
TimeBaseAMatchTcr1CaptureTcr1GreaterEqual()
DetectAHighOnMatchA() // IPACA - Is Current High
OnInputActionAPinLow() // OPACA - Shut off drive
/* ... */
eTPU Channel A
+
–
V
REF
ChA
out
ChA
in
L/R
Short
Normal
t
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