AS5161

Datasheet - Detailed Descr i p ti on

www.ams.com

Revision 1.1

10 - 35

8.2 PWM Output

By default (after programmed CUST_LOCK OTP bit) the PWM output mode is selected. The pin OUT provides a modulated signal that is

proportional to the angle of the rotating magnet. Due to an intelligent approach a permanent short circuit will not damage the device. This is also

feasible in a high voltage condition up to 20 V and at the highest specified ambient temperature.

After the digital signal processing (DSP) a PWM engine provides the output signal.

The DSP maps the application range to the output characteristic. An inversion of the slope is also programmable to allow inversion of the rotation

direction.

An on-chip diagnostic feature handles the error state at the output. Depending on the failure the output is in HiZ condition or indicates a PWM

signal within the failure bands of 4 – 96 % duty cycle. (see Table 9)

8.2.1 Programming Parameters

The PWM output characteristic is programmable by OTP. Depending on the application, the output can be adjusted. The user can program the

following application specific parameters:

These parameters are input parameters. Using the available programming software and programmer these parameters are converted and finally

written into the AS5161 128 bit OTP memory.

T1

Mechanical angle start point

T2

Mechanical angle end point

T1Y

% duty cycle level at the T1 position

T2Y

% duty cycle level at the T2 position

CLL

Clamping Level Low

CLH

Clamping Level High

BP

Break point (transition point 0 to 360º)

C1

Calibration Point 1

C2

Calibration Point 2

C1Y

Trim value for C1

C2Y

Trim value for C2