AS5147P-HTST datasheet(23/40 Pages) AMSCO

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[v1-01] 2015-May-12

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AS5147P − Detailed Description

PWM

The PWM can be enabled with the bit setting PWMon. The PWM

encoded signal is displayed on the pin W or the pin I. The bit

setting UVW_ABI defines which output is used as PWM. The

PWM output consists of a frame of 4119 PWM clock periods, as

shown in Figure 34. The PWM frame has the following sections:

• 12 PWM Clocks for INIT

• 4 PWM Clocks for Error detection

• 4095 PWM clock periods of data

• 8 PWM clock periods low

The angle is represented in the data part of the frame with a

12-bit resolution. One PWM clock period represents 0.088

degree and has a typical duration of 444 ns.

If the embedded diagnostic of the AS5147P detects any error

the PWM interface displays only 12 clock periods high

(0.3% duty-cycle).

Figure 34:

Pulse Width Modulation Encoded Signal

time

data

8 clock pulse

low

12 clock

pulses

Init

4 clock

pulses

Error_n

12 PWM Clocks INIT –> High

4 PWM Error –> Low if error occurs

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