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AS5130

Data Sheet - D e ta i l e d D e s c r i p t i o n

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)

angle [ º ] =

(EQ 2)

results in a degree value from 0º ...358.6º

Analog Output

The AS5130 can generate a ratiometric analog output voltage by low-pass filtering the PWM output. Figure 8 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.

Position

Angle

High

t_high

Low

t_low

Duty-Cycle

0

0º

1

0,556

256

142,3

0.39%

127

178.59

128

71,15µs

129

71,7µs

49.4%

128

180º

129

71,7µs

128

71,15µs

50.2%

255

358.59º

256

142,3µs

1

0,556µs

99.6%

5V

5V

PWM out

0.556µs

142.3µs

71.7µs

71.15µs

0.556µs

142.3µs

0

128

255

Position

257

+

--------------------------

⎝⎠

⎛⎞

360

256

---------

257

+

--------------------------

⎝⎠

⎛⎞ 1

–