AS5045 datasheet(21/47 Pages) AMSCO

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ams Datasheet

Page 21

[v2-01] 2017-Jul-13

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AS5045 − Detailed Description

When PWMhalfEN = 1, the PWM timing is as shown in Figure 21.

Figure 21:

PWM Signal Parameters with Half Frequency (OTP Option)

Analog Output

An analog output can be generated by averaging the PWM

signal, using an external active or passive low pass 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 22:

Simple 2nd Order Passive RC Low Pass Filter

Figure 22 shows an example of a simple passive low pass filter

to generate the analog output.

R1, R2

≥ 4k7C1,

≥ 1μF / 6V

R1 should be greater than or equal to 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.

Symbol

Parameter

Typ

Unit

Note

fPWM

PWM frequency

122

Signal period: 8194μs

PWMIN

MIN pulse width

μs

• Position 0d

• Angle 0 deg

PWMAX

MAX pulse width

8192

μs

• Position 4095d

• Angle 359.91 deg

analog out

Pin12

PWM

Pin7

VSS

VDD

0º

360º

(EQ2)

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