參數(shù)資料
型號(hào)： AS5130-ASST-500
廠商： ams
文件頁(yè)數(shù)： 33/33頁(yè)
文件大?。?/td> 4323K
描述： IC ENCODER ROTORY 8-BIT 16-SSOP
標(biāo)準(zhǔn)包裝： 500
傳感范圍： 32mT ~ 75mT
類型： 線性，旋轉(zhuǎn)編碼器 - 可編程
電源電壓： 4.5 V ~ 5.5 V
電流 - 電源： 24mA
輸出類型： 模擬，比率
特點(diǎn)： 可編程
工作溫度： -40°C ~ 125°C
封裝/外殼： *
供應(yīng)商設(shè)備封裝： *
包裝： *
www.austriamicrosystems.com/AS5130
Revision 1.12
32 - 41
AS5130
Datasheet - Application Information
8.4.2   Vertical Distance of the Magnet
The chip-internal automatic gain control (AGC) regulates the input signal amplitude for the tracking-ADC to a constant value. This improves the
accuracy of the encoder and enhances the tolerance for the vertical distance of the magnet.
Figure 27. Typical Curves for Vertical Distance versus ACG Value on Several Untrimmed Samples
As shown in Figure 27, the AGC value (left Y-axis) increases with vertical distance of the magnet. Consequently, it is a good indicator for
determining the vertical position of the magnet, for example as a pushbutton feature, as an indicator for a defective magnet or as a preventive
warning (e.g. for wear on a ball bearing etc.) when the nominal AGC value drifts away. If the magnet is too close or the magnetic field is too
strong, the AGC will be reading 0. If the magnet is too far away (or missing) or if the magnetic field is too weak, the AGC will be reading 63 (3FH).
The AS5130 will still operate outside the AGC range, but the accuracy may be reduced as the signal amplitude can no longer be kept at a
constant level. The linearity curve in Figure 27 (right Y-axis) shows that the accuracy of the AS5130 is best within the AGC range, even slightly
better at small airgaps (0.4  0.8mm). At very short distances (0  0.1) the accuracy is reduced, mainly due to nonlinearities in the magnetic field.
At larger distances, outside the AGC range (~2.0  2.5mm and more) the accuracy is still very good, only slightly decreased from the nominal
accuracy. Since the field strength of a magnet changes with temperature, the AGC will also change when the temperature of the magnet
changes. At low temperatures, the magnetic field will be stronger and the AGC value will decrease. At elevated temperatures, the magnetic field
will be weaker and the AGC value will increase.
Linearity and AGC vs Airgap
0
8
16
24
32
40
48
56
64
0
500
1000
1500
2000
2500
Airgap [祄]
1,0
1,2
1,4
1,6
1,8
2,0
2,2
sample#1
sample#2
sample#3
sample#4
Linearity [癩
 
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