AS5130ATST AMSCO [austriamicrosystems AG], AS5130ATST Datasheet - Page 13

• Manufacturer Part Number: AS5130ATST
• Description: 8 Bit Programmable Magnetic Rotary Encoder with Motion Detection & Multiturn
• Manufacturer: AMSCO [austriamicrosystems AG]

AS5130
Data Sheet - D e t a i l e d D e s c r i p t i o n
Figure 8.
Table 8.
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:
results in an 8-bit value from 00
results in a degree value from 0º ...358.6º
Note: The absolute frequency tolerance is eliminated by dividing t
Analog Output
The AS5130 can generate a ratiometric analog output voltage by low-pass filtering the PWM output.
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.
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Position
127
128
255
timing effects both T
0
PWM out
5V
5V
0
0.556µs
358.59º
178.59
Angle
180º
142.3µs
0º
ON
and T
H
to FF
angle [ º ] =
OFF
angle [ 8 - bit ] =
H
,
High
128
129
256
in the same way.
1
360
-------- -
256
71.15µs
128
71.7µs
Revision 1.00
⎛
⎝
⎛
⎝
142,3µs
71,15µs
257
257
t_high
71,7µs
0,556
--------------------------
t
--------------------------
t
ON
ON
t
t
+
+
ON
ON
t
t
OFF
OFF
ON
⎞
⎠
⎞ 1 –
⎠
by (t
-1
Low
256
129
128
ON
1
142.3µs
+T
OFF
0.556µs
), as the change of the absolute
71,15µs
0,556µs
255
71,7µs
t_low
142,3
t
t
on
off
Figure 9
Position
Duty-Cycle
0.39%
49.4%
50.2%
99.6%
shows a
13 - 41
(EQ 1)
(EQ 2)