AS5170 datasheet(21/47 Pages) AMSCO

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[v1-01] 2016-Apr-11

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AS5170 − Register Description

The hysteresis LSB is based on the core resolution (14-bit). The

AS5170 features a programmable digital filter. As shown in

Figure 25 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 is not usable in 360° range, if the Hysteresis setting is on.

Figure 26:

Step Response

Figure 27:

FILTER Setting

The FBS setting allows selecting the failure band (lower or

upper) when the output goes into diagnostic mode.

Multiple Quadrants

The multiple quadrants option allows repeating the same

output control parameters up to 4 times over the full turn

rotation as shown in the Figure 29, Figure 30, and Figure 31. The

QUAD parameter sets the number of quadrants, as shown in the

Figure 28.

FILTER

Dynamic Error Band [LSB]

Step Response

Time [µs]

Filter off

Not applicable

5 CORDIC cycles

Dynamic

Error Band

Input

Output

response

Sampling

Frequency

Step Response

Time

1000ms

Static Error Band

Measured Angle

time

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