AS5045-ASST datasheet(20/47 Pages) AMSCO

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[v2-01] 2017-Jul-13

AS5045 − Detailed Description

Pulse Width Modulation (PWM) Output

The AS5045 provides a pulse width modulated output (PWM),

whose duty cycle is proportional to the measured angle:

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.

Figure 19:

PWM Output Signal

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 Programming

the AS5045). With PWMhalfEN = 0, the PWM timing is as shown

in Figure 20.

Figure 20:

PWM Signal Parameters (Default mode)

Symbol

Parameter

Typ

Unit

Note

fPWM

PWM frequency

244

Signal period: 4097μs

PWMIN

MIN pulse width

μs

- Position 0d

- Angle 0 deg

PWMAX

MAX pulse width

4096

μs

- Position 4095d

- Angle 359.91 deg

(EQ1)

() 1

4097 −

⋅

off

Position

4097µs

4096µs

1/fPWM

PWMAX

PWMIN

359.91 deg

(Pos 4095)

0 deg

(Pos 0)

Angle

1µs

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