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| 型号： | MCZ33991EGR2 |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 21/36页 |
| 文件大小： | 0K |
| 描述： | IC GAUGE DRIVER SPI 24-SOIC |
| 标准包装： | 1,000 |
| 应用： | 步进电机驱动器，2 相 |
| 输出数： | 2 |
| 电流 - 输出： | 100mA |
| 电源电压： | 6.5 V ~ 26 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 24-SOIC W |
| 包装： | 带卷 (TR) |
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TIMING DESCRIPTIONS AND DIAGRAMS
DEVICE FUNCTIONAL DESCRIPTION
Table 16. Coil Step Value
20
21
22
23
300
315
330
345
-0.866
-0.707
-0.5
-0.259
-
-
-
-
222
181
128
66
DE
B5
80
42
0.5
0.707
0.866
0.966
+
+
+
+
128
181
222
247
80
B5
DE
F7
Notes * Denotes Normalized Values.
v = 2 ? u
The motor is stepped by providing index commands at
intervals. The time between steps defines the motor velocity,
and the changing time defines the motor acceleration.
The state machine uses a table defining the allowed time
steps, including the maximum velocity. A useful side effect of
the table is, it also allows the direct determination of the
position the velocity should reduce to allow the motor to stop
at the desired position.
The motor equations of motion are generated as follows:
The units of position are steps, and velocity and
acceleration are in steps/second, and steps/second2
From an initial position of 0, with an initial velocity u , the
motor position, s at a time t is
v 2 = u 2 + 2 as
and
v = u + at
and solving for v in terms of u , s and t gives:
t
The correct value of t to use in this equation is the
quantized value obtained above.
From these equations, a set of recursive equations can be
s = ut +
1
2 at
2
generated to give the allowed time step between motor
indexes when the motor is accelerating from a stop to its
For unit steps, the time between steps is:
maximum velocity.
Starting from a position p of 0, and a velocity v of 0, these
? t =
? u + u 2 + 2 a
a
equations define the time interval between steps at each
position. To drive the motor at maximum performance, index
commands are given to the motor at these intervals. A table
is generated giving the time step ? t at an index position n .
? ? v
? t n = ?
v n ? 1 v + 0 2 a = ? 0
This defines the time increment between steps when the
motor is initially travelling at a velocity μ . In the ROM, this time
is quantized to multiples of the system clock by rounding
upwards, ensuring acceleration never exceeds the allowed
value. The actual velocity and acceleration is calculated from
the time step actually used.
?
?
rounding up.
n ? 1 +
2
p 0 = 0
?
a ?
? , where
? ? indicates
Using
33991
Analog Integrated Circuit Device Data
Freescale Semiconductor
21
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