参数资料
型号: AS5030 DB
厂商: ams
文件页数: 34/44页
文件大小: 0K
描述: BOARD DEMO AS5030
标准包装: 1
传感器类型: 磁性,旋转位置
传感范围: 360°
接口: USB
电源电压: 5V USB 或 7.5V
嵌入式: 是,MCU,8 位
已供物品:
已用 IC / 零件: AS5030
AS5030
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
8.8 Accuracy of the Encoder System
This chapter describes which individual factors influence the accuracy of the encoder system and how to improve them.
Accuracy is defined as the difference between measured angle and actual angle. This is not to be confused with resolution, which is the smallest
step that the system can resolve.
The two parameters are not necessarily linked together. A high resolution encoder may not necessarily be highly accurate as well.
8.8.1
Quantization Error
There is however a direct link between resolution and accuracy, which is the quantization error:
Figure 28. Quantization Error of a Low Resolution and a High Resolution System
Quantization
Error
ideal function
digitized
function
low
resolution
ideal function
digitized
function
high
resolution
+? LSB
-? LSB
error
+? LSB
-? LSB
The resolution of the encoder determines the smallest step size. The angle error caused by quantization cannot get better than ± ? LSB. As
shown in Figure 28 , a higher resolution system (right picture) has a smaller quantization error, as the step size is smaller.
For the AS5030, the quantization error is ± ? LSB = ± 0.7°
Figure 29. Typical INL Error Over 360°
INL including quantization error
1,5
1
0,5
0
-0,5
-1
-1,5
0
45
90
135
180
225
270
315
360
Angle steps
INL
Average (16x)
www.ams.com/AS5030
Revision 2.4
34 - 44
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