AS5043

Data Sheet – Angular Output Tolerances

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Revision 1.80

26 – 36

s

rpm

n

μ

384

60

⋅

=

for slow mode

In practice, there is no upper speed limit. The only restriction is that there will be fewer samples per revolution as the

speed increases.

Regardless of the rotational speed, the absolute angular value is always sampled at the highest resolution.

Table 6: Speed Performance

Fast Mode

(Pin Mode = 1)

Slow Mode

(Pin Mode = 0 or open)

610rpm = 1024 samples / turn

610rpm = 256 samples / turn

1220rpm = 512 samples / turn

1220rpm = 128 samples / turn

2441rpm = 256 samples / turn

2441rpm = 64 samples / turn

etc…

etc…

18.5 Output Delays

The propagation delay is the delay between the time that the sample is taken until it is available as angular data. This

delay is 96µs in fast mode (pin Mode = high) and 384µs in slow mode (pin Mode = low or open).

The analog output produces no further delay, the output voltage will be updated as soon as it is available. Using the SSI

interface for data transmission, an additional delay must be considered, caused by the asynchronous sampling

18.5.1 Angular Error Caused by Propagation Delay

A rotating magnet will cause an angular error caused by the propagation delay.

This error increases linearly with speed:

delay

pr

rpm

e

sampling

.

6

(deg)

∗

∗

=

where

rpm

= rotating speed [rpm]

prop.delay

= propagation delay [seconds]

Note: since the propagation delay is known, it can be automatically compensated by the control unit processing the data

from the AS5043.

18.6 Internal Timing Tolerance

The AS5043 does not require an external ceramic resonator or quartz. All internal clock timings for the AS5043 are

generated by an on-chip RC oscillator. This oscillator is factory trimmed to

±5% accuracy at room temperature (±10%

over full temperature range). This tolerance influences the ADC sampling rate:

18.6.1 Absolute Output; SSI Interface

A new angular value is updated every

96µs +/- 5% (Mode = 1) or

384µs +/- 5% (Mode = 0 or open)