AS5040 View Datasheet(PDF) - austriamicrosystems AG
Part Name
Description
MFG CO.
'AS5040' PDF : 61 Pages View PDF
Figure 23:
Status Bit Outputs
OCF COF
LIN
1
0
0
AS5040 − 10-Bit Absolute AngularPositionOutput
The two pins may also be combined with a single pull-up
resistor. In this case, the signal is high when the magnetic field
is in range. It is low in all other cases (see Figure 22).
Even Parity bit for transmission error detection of bits 1 to 15
(D9 to D0, OCF, COF, LIN, MagINCn, MagDECn).
The absolute angular output is always set to a resolution of 10
bit. Placing the magnet above the chip, angular values increase
in clockwise direction by default.
Data D9:D0 is valid, when the status bits have the following
configurations:
Mag INCn
0
0
1
Mag DECn
0
1
0
Parity
Even checksum of bits 1:15
The absolute angular position is sampled at a rate of 10kHz
(0.1ms). This allows reading of all 1024 positions per 360
degrees within 0.1 seconds = 9.76Hz (~10Hz) without skipping
any position. Multiplying 10Hz by 60, results the corresponding
maximum rotational speed of 600 rpm.
Readout of every second angular position allows for rotational
speeds of up to 1200rpm.
Consequently, increasing the rotational speed reduces the
number of absolute angular positions per revolution (see
Figure 46). Regardless of the rotational speed or the number of
positions to be read out, the absolute angular value is always
given at the highest resolution of 10 bit.
The incremental outputs are not affected by rotational speed
restrictions due to the implemented interpolator. The
incremental output signals may be used for high-speed
applications with rotational speeds of up to 30000 rpm without
missing pulses.
Page 20
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[v2-12] 2017-Jun-20
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