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參數(shù)資料
| 型號： | AA2820 |
| 英文描述： | Controller Miscellaneous - Datasheet Reference |
| 中文描述： | 控制器雜項(xiàng)-數(shù)據(jù)表參考 |
| 文件頁數(shù)： | 7/7頁 |
| 文件大小： | 296K |
| 代理商： | AA2820 |
VLV
VHV
+5V
2
3
21
22
OP
C/P
I/P
Vdd
1
IN 1
23
IN 2
5
IN 3
20
IN 4
8
ON/OFF
GND
GND
14
12
24
OUT 3
7
OUT 1
6
OUT 5
4
Vdd
13
OSC IN
9
OSC OUT10
PRESET11
R1316
R2417
OUT 2
OUT 4
19
18
OUT 6
15
AA2020A
+5V
Rsense
VHV
+5V
+5V
+5V
49.9K
0.1uF
124
10K
CLOCK
CCW
DIRECTION
HS/FS
ON/OFF
220pF
4.22K
VLV
Rsense
Vdd
Q1
Q2
Q3
Q4
Q5
Q6
C1
C2
11
12
HALF-STEP/FULL-STEP
CONNECTION DIAGRAM
The AA2020A and AA2820 can operate a motor in half-step or full-step
operation. In half-step mode, the motor is stepped by alternately energizing
one phase, and then two phases of the motor. With a 1.8 degree motor (200
steps/rev), half-step mode will provide 400 steps/revolution. Table 2 below
shows the sequence for half-step.
PHASE 1
PHASE 2
PHASE 3
PHASE 4
CC
W
CW
1
0
0
0
1
1
0
0
0
1
0
0
0
1
1
0
0
0
1
0
0
0
1
1
0
0
0
1
1
0
0
1
Table 2: Half-step Phase Sequence 1=ON, 0=OFF
In Full-step mode, there are always two phases on at a time. The motor is
stepped by turning off a phase and turning on the opposite phase (i.e. - turn
phase 1 off and turn phase 3 on). A standard 1.8 degree motor will provide
200 steps/revolution in full-step mode. The phase sequence for full-step is
shown in figure y2.
PHASE 1
PHASE 2
PHASE 3
PHASE 4
darlington transistors used as high-side switches. The Rsense resistors are
used to sense the current flowing through the motor. When the current in
phase 1 or 3 reaches a level set by the potentiometer, comparator C1 goes
low (logic "0") and resets (turns off) OUT5. The same thing happens for phase
2 and 4.
CC
W
CW
1
1
0
0
0
1
1
0
0
0
1
1
1
0
0
1
Table 3: Full-step Phase Sequence 1=ON, 0=OFF
Figure 9: Typical hookup for unipolar bilevel step motor driver using
AA2020A.
Figure 9 shows a typical hookup with the AA2020A chip. Q1-Q4 are npn
darlington transistors used for the 4 phase outputs. Q5 and Q6 are pnp
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