AS5171 datasheet(20/42 Pages) AMSCO

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[v1-01] 2016-Feb-17

AS5171 − Register Description

The AS5171 features a programmable digital filter which

implements programmable step response. As shown in

Figure 24 in a static condition (no change of the input), the

static error band is ±0.5 LSB (at 12-bit resolution). Whenever an

input step occurs, the output (measured angle) follows the

input (mechanical angle) entering a certain error band within

the step response time. From the time when the output is within

the static error band the output takes 1000 ms to settle to the

static error band achieving again ±0.5 LSB output noise.

The filter feature is only for applications with angle segment

lower 20 degrees (e.g. pedal). If the filter is used, the quadrant

setting is not possible to use.

Figure 24:

Step Response

It is possible to optimize the step response time versus the

dynamic error band with the FILTER setting.

Figure 25:

FILTER Setting

FILTER

Dynamic Error Band [LSB]

Step Response Time

Default. Filter disabled

5 CORDIC cylces

3 CORDIC cycles

2 CORDIC cycles

Dynamic

Error Band

Input

Output

response

Sampling

Frequency

Step Response

Time

1000ms

Static Error Band

Measured Angle

time

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