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參數資料
型號: AS5130-ASST-500
廠商: ams
文件頁數: 13/33頁
文件大小: 4323K
描述: IC ENCODER ROTORY 8-BIT 16-SSOP
標準包裝: 500
傳感范圍: 32mT ~ 75mT
類型: 線性,旋轉編碼器 - 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: 可編程
工作溫度: -40°C ~ 125°C
封裝/外殼: *
供應商設備封裝: *
包裝: *
www.austriamicrosystems.com/AS5130
Revision 1.12
12 - 41
AS5130
Datasheet - Detailed Description
The minimum PWM pulse width t
ON
 (PWM = high) is 1 LSB @ 0?(Angle reading = 00
H
). 1LSB = nom. ,0.556祍. The PWM pulse width increases
with 1LSB per step. At the maximum angle 358.6?(Angle reading = FF
H
), the pulse width t
ON
 (PWM = high) is 256 LSB and the pause width t
OFF
 
(PWM = low) is 1 LSB. This leads to a total period (t
ON
 + t
OFF
) of 257LSB.
Figure 9. PWM Output Signal
This means that the PWM pulse width is (position + 1) LSB, where position is 0&.255.
The tolerance of the absolute pulse width and frequency can be eliminated by calculating the angle with the duty cycle rather than with the
absolute pulse width:
angle [ 8 - bit ] =
 -1
(EQ 1)
results in an 8-bit value from 00
H
 to FF
H
,
angle [ ?] =
 
(EQ 2)
results in a degree value from 0?...358.6?/DIV>
Note:   The absolute frequency tolerance is eliminated by dividing t
ON
 by (t
ON
+T
OFF
), as the change of the absolute timing effects both T
ON
 
and T
OFF
 in the same way.
7.1.4   Analog Output
The AS5130 can generate a ratiometric analog output voltage by low-pass filtering the PWM output. Figure 10 shows a simple passive 2nd order
low pass filter as an example. In order to minimize the ripple on the analog output, the cut-off frequency of the low pass filter should be well below
the PWM base frequency.
Table 8. PWM Signal Parameters
Position
Angle
LSB @ High
t_high
Low Column
t_low
Duty-Cycle
0
0?/DIV>
1
0.556祍
256
142.3祍
0.39%
127
178.59?/DIV>
128
71.15祍
129
71.7祍
49.4%
128
180?/DIV>
129
71.7祍
128
71.15祍
50.2%
255
358.59?/DIV>
256
142.3祍
1
0.556祍
99.6%
5V
PWM out
0.556祍
142.3祍
71.7祍
71.15祍
0.556祍
142.3祍
t
on
t
off
0
128
255
Position
257
t
ON
t
ON
t
OFF
+
----------- -------------- -
?/DIV>
?/DIV>
60
56
------ -    257
t
ON
t
ON
t
OFF
+
------------- ------------ -
?/DIV>
?/DIV>
?/DIV>
?/DIV>
1

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