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AS5045 数据表(PDF) 13 Page - ams AG

部件名 AS5045
功能描述  12 BIT PROGRAMMABLE MAGNETIC ROTARY ENCODER
PDF  24 Pages
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制造商  AMSCO [ams AG]
网页  http://www.ams.com
标志 AMSCO - ams AG

AS5045 数据表(HTML) 13 Page - ams AG

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AS5045 12-BIT PROGRAMMABLE MAGNETIC ROTARY ENCODER
Revision 1.5
www.austriamicrosystems.com
Page 13 of 24
6
Pulse Width Modulation (PWM)
Output
The AS5045 provides a pulse width modulated output
(PWM), whose duty cycle is proportional to the measured
angle:
() 1
4097 −
+
⋅
=
off
on
on
t
t
t
Position
The PWM frequency is internally trimmed to an accuracy
of
±5% (±10% over full temperature range). This
tolerance can be cancelled by measuring the complete
duty cycle as shown above.
1/fPWM
Angle
359.91 deg
(Pos 4095)
0 deg
(Pos 0)
1µs
4097µs
PWMIN
PWMAX
4096µs
Figure 8: PWM output signal
6.1
Changing the PWM Frequency
The PWM frequency of the AS5045 can be divided by two
by setting a bit (PWMhalfEN) in the OTP register (see
chapter 8). With PWMhalfEN = 0 the PWM timing is as
shown in Table 6:
Parameter
Symbol
Typ
Unit
Note
PWM
frequency
fPWM
244
Hz
Signal period:
4097µs
MIN pulse
width
PWMIN
1
µs
- Position 0d
- Angle 0 deg
MAX pulse
width
PWMAX
4096
µs
- Position 4095d
- Angle 359.91 deg
Table 6: PWM signal parameters (default mode)
When PWMhalfEN = 1, the PWM timing is as shown in
Table 7:
Parameter
Symbol
Typ
Unit
Note
PWM
frequency
fPWM
122
Hz
Signal period:
8194µs
MIN pulse
width
PWMIN
2
µs
- Position 0d
- Angle 0 deg
MAX pulse
width
PWMAX
8192
µs
- Position 4095d
- Angle 359.91 deg
Table 7: PWM signal parameters with half frequency (OTP option)
7
Analog Output
An analog output can be generated by averaging the
PWM signal, using an external active or passive lowpass
filter. The analog output voltage is proportional to the
angle: 0°= 0V; 360° = VDD5V.
Using this method, the AS5045 can be used as direct
replacement of potentiometers.
Figure 9: Simple 2nd order passive RC lowpass filter
Figure 9 shows an example of a simple passive lowpass
filter to generate the analog output.
R1, R2
≥ 4k7
C1, C2
≥ 1µF / 6V
R1 should be
≥4k7 to avoid loading of the PWM output.
Larger values of Rx and Cx will provide better filtering
and less ripple, but will also slow down the response
time.
360°
C1
R1
R2
analog out
C2
Pin12
PWM
Pin7
VSS
0°
0V
VDD



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