AS5030_1 AMSCO [austriamicrosystems AG], AS5030_1 Datasheet - Page 13

• Manufacturer Part Number: AS5030_1
• Description: 8 BIT PROGRAMMABLE HIGH SPEED MAGNETIC ROTARY ENCODER
• Manufacturer: AMSCO [austriamicrosystems AG]

VSS
AS5030 8-bit Programmable Magnetic Rotary Encoder
4.19 Analog Output
Figure 14: Data transmission with pulse width modulated (PWM) output
Figure 15: Relation of PWM/Analog output with angle
4.20 Analog Sin/Cos outputs with external interpolator
The SIN / COS / SINn / COSn signals are amplitude controlled to ~1.3Vp (differential) by the internal AGC controller. The DC
bias voltage is 2.25 V.
If the SIN(n)- and COS(n)- outputs cannot be sampled simultaneously, it is recommended to disable the automatic gain control
(see 5.2.2) as the signal amplitudes may be changing between two readings of the external ADC. This may lead to less accurate
results.
Rev. 1.8
VDD
+5V
100n
VSS
VDD
+5V
micro
controller
CS
11
14
C1
AS5030
VDD
VSS
15
C2
D A
D A
13
VSS
3
VDD
PWM
16
>=4k7
>=1µF
5
4
7
6
>=4k7
Cos
Cosn
Sin
Sinn
>=1µF
14
C1
www.austriamicrosystems.com
15
AS5030
C2
VDD
VSS
Analog
13
out
3
100n
This configuration is similar to the PWM connection (only three
lines including supply are required). With the addition of a lowpass
filter at the PWM output, this configuration produces an analog
voltage that is proportional to the angle.
This filter can be either passive (as shown) or active. The lower
the bandwidth of the filter, the less ripple of the analog output can
be achieved.
If the AS5030 angular data is invalid, the PWM output will remain
at low state and thus the analog output will be 0V. 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).
By connecting C1 to VDD, the AS5030 provides analog
Sine and Cosine outputs (Sin, Cos) of the Hall array
front-end for test purposes. These outputs allow the user
to perform the angle calculation by an external ADC +
µC, e.g. to compute the angle with a high resolution.
In addition, the inverted Sine and Cosine signals (Sinn,
Cosn; see dotted lines) are available for differential
signal transmission.
The input resistance of the receiving amplifier or ADC
should be greater than 100kΩ. The signal lines should be
kept as short as possible, longer lines should be shielded
in order to achieve best noise performance.
Figure 16: Sine and Cosine outputs for external angle calculation
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