參數(shù)資料
型號: DRM010
英文描述: Vacuum Cleaner Designer Reference Manual
中文描述: 吸塵器設(shè)計(jì)參考手冊
文件頁數(shù): 21/72頁
文件大小: 1177K
代理商: DRM010
Vacuum Cleaner Reference Design
System Design
DRM010 — Rev 0
Designer Reference Manual
MOTOROLA
Vacuum Cleaner Reference Design
For More Information On This Product,
Go to: www.freescale.com
21
Figure 1-6. Vacuum Cleaner Software Development System
While it is possible to drive the triac directly, an NPN drive circuit has
several advantages. The NPN drive circuit consists of Q3, R3, R10, and
R22 in
Figure 1-6
. The NPN drive circuit uses only one port pin. Using
the output compare pin of the timer provides accurate
hardware-generated timing. Multiple pins can be manipulated only by
using software and they have a resulting interrupt latency. The NPN
transistor drive also has better EMC (electromagnetic compliance)
robustness than a direct drive solution. The MCU is not exposed to
current injection due to the triac gate drive voltage. The cost of a small
NPN is less than the cost of a good Schottky diode or zener diode that
are commonly used for EMC protection.
J4
HC908KX8
V
SS
PTA1
PTA0
IRQ
PTB0/AD0
PTB1/AD1
PTB2/AD2
PTB3/AD3
1
2
3
4
5
6
7
8
V
SS
V
DD
V
DD
PTA4
PTA3/TCH1
PTA2/TCH0
PTB4/RxD
PTB5/TxD
PTB6/OSC1
PTB7/OSC2
16
15
14
13
12
11
10
9
V
SS
R1
10 k
V
DD
C3
100 nF
U1
D1
MBR160
+
C14
100
μ
F
U7
MC78L05
V
DD
C8
1.0
μ
F
R10
1.0 k
V
SS
R22
10 k
V
DD
Q1
MAC12M
Q3
R3
110
J3
X1
V
SS
V
DD
R24
10 k
V
SS
C6
100 nF
V
DD
S1
S2
V
SS
R7
470
D3
Q5
V
DD
C5
100 nF
V
DD
R16
220 k
R17
220 k
R26
10 k
R18
10 k
V
SS
V
SS
V
SS
F
Freescale Semiconductor, Inc.
n
.
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