as5030 austriamicrosystems, as5030 Datasheet - Page 12

• Manufacturer Part Number: as5030
• Description: 8-bit High-speed Absolute Magnetic Rotary Encoder
• Manufacturer: austriamicrosystems

AS5030 8-bit Programmable Magnetic Rotary Encoder
4.18 1-Wire PWM Connection
Figure 13: Data transmission with pulse width modulated (PWM) output
The minimum PWM pulse width t
1LSB = nom. 2.26µs.
The PWM pulse width increases with 1LSB per step. At the maximum angle 358.6° (Angle reading = FF
the pulse width t
This leads to a total period (t
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 0° ~ 358.6°
Note: the absolute frequency tolerance is eliminated by dividing t
both T
Rev. 1.8
angle
angle
VSS
VDD
+5V
ON
Micro
Controller
[
[ ]
8
°
and T
−
=
VDD
VSS
bit
360
256
OFF
]
ON
Input
=
in the same way.
Position
(PWM = high) is 256 LSB and the pause width t
⎡
⎢
⎣
⎛
⎜ ⎜
⎝
⎛
⎜ ⎜
⎝
127
128
255
257
257
0
t
t
ON
ON +
ON
t
358.59°
H
t
178.59
+
ON
ON
16
+
ON
Angle
t
to FF
180°
OFF
t
t
0°
(PWM = high) is 1 LSB @ 0° (Angle reading = 00
OFF
OFF
PWM
) of 257LSB.
11
CS
H
14
,
⎞
⎟ ⎟
⎠
⎞
⎟ ⎟
⎠
C1
AS5030
−
−
15
1
C2
1
High
⎤
⎥
⎦
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128
129
256
13
1
VSS
3
VDD
100n
287.02µs
291.54µs
578.56µs
2.26µs
t_
high
This configuration uses the least number of wires: only one line
(PWM) is used for data, leaving the total number of connection
to three, including the supply lines. This type of configuration
is especially useful for remote sensors.
Ultra Low Power Mode is not possible in this configuration, as
there is no bi-directional data transmission.
If the AS5030 angular data is invalid, the PWM output will
remain at low state. Pins that are not shown may be left open.
Note that the PWM output is invalid when the AGC is disabled
(see 5.2.2).
ON
OFF
by (t
(PWM = low) is 1 LSB.
Low
256
129
128
ON
1
+T
OFF
), as the change of the absolute timing effects
578.56µs
291.54µs
287.02µs
2.26µs
t_
H
).
low
Duty-Cycle
0.39%
49.4%
50.2%
99.6%
H
),
Page 12 of 33