www.austriamicrosystems.com/AS5140H

Revision 1.4

17 - 37

AS5140H

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

Figure 10. PWM Output Signal

7.4 Analog Output

An analog output may be generated by averaging the PWM signal, using an external active or passive lowpass filter. The analog output voltage

is proportional to the angle: 0º = 0V; 360º = VDD5V. Using this method, the AS5140H can be used as direct replacement of potentiometers.

Figure 11. Simple Passive 2

R1,R2

C1,C2

(EQ 3)

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.

Table 18. PWM Signal Parameters

Symbol

Parameter

Typ

Unit

Note

PWM frequency

0.9756

kHz

Signal period: 1025µs

MIN pulse width

1

µs

- Position 0d

- Angle 0 deg

MAX pulse width

1024

µs

- Position 1023d

- Angle 359.65 deg

1025µs

1024µs

359.65 deg

(Pos 1023)

0 deg

(Pos 0)

Angle

1µs

R1

R2

analog out

Pin12

PWM

Pin7

VSS

C1

C2

VDD

0V

0º

360º