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AS5311
Datasheet - D e t a i l e d D e s c r i p t i o n
Data D11:D0 is valid, when the status bits have the following configurations:
Table 12. Status Bit Outputs
OCF
COF
LIN
MagINC
MagDEC
Parity
0
0
1
0
0
0
1
1
0
Even checksum of bits 1:17
1*
1*
*MagInc=MagDec=1 is only recommended in YELLOW mode (see Table 13) .
7.4 Absolute Output Jitter and Hysteresis
Note: There is no hysteresis or additional filtering at the absolute output. This allows a determination of the magnet’s absolute position within
one pole pair down to submicron range.
Due to the intentionally omitted hysteresis and due to noise (e.g. from weak magnetic fields), the absolute output may jitter when the magnet is
stationary over the chip. In order to get a stable 12-bit absolute reading, two common methods may be implemented to reduce the jitter.
7.4.1
Adding a Digital Hysteresis
The hysteresis feature of the incremental outputs is described in Incremental Output Hysteresis . An equivalent function can be implemented in
the software of the external microcontroller. The hysteresis should be larger than the peak-to-peak noise (=jitter) of the absolute output in order
to mask it and create a stable output reading.
Note: The 2-bit hysteresis on the incremental output (=3.9μm) is equivalent to a hysteresis of 8LSB on the absolute output.
7.4.2
Implementing Digital Filtering
Another useful alternative or additional method to reduce jitter is digital filtering. This can be accomplished simply by averaging, for example a
moving average calculation in the external microcontroller. Averaging 4 readings results in 6dB (=50%) noise and jitter reduction. An average of
16 readings reduces the jitter by a factor of 4.
Averaging causes additional latency of the processed data. Therefore it may be useful to adjust the depth of averaging depending on speed of
travel. For example using a larger depth when the magnet is stationary and reducing the depth when the magnet is in motion.
7.5 Z-axis Range Indication (“Red/Yellow/Green” Indicator)
The AS5311 provides several options of detecting the magnet distance by indicating the strength of the magnetic field. The signal indicator pins
MagINCn and MagDECn are available as hardware pins (pins 2 and 3) and display the “Red/Yellow/Green Range”.
Additionally, the serial data stream (see Figure 6) offers the MagINC, MagDEC and LIN status bits. The LIN status bit indicates the non-
recommended “red” range. The MAGnitude register provides additional information about the strength of the magnetic field (see Figure 7) . For Z-
axis Range Indication only M11:M4 of the magnitude are used.
The digital status bits MagINC, MagDec, LIN and the hardware pins MagINCn, MagDECn have the following function:
Table 13. Magnetic Field Strength Red-Yellow-Green Indicators
Status Bits
MAG
Hardware Pins
1
MagINC MagDEC
LIN
M11…M4 MagINCn MagDECn
Description
0
0
0
3F hex
Off
Off
No distance change
Magnetic input field OK (GREEN range, ~10…40mT peak amplitude)
Distance increase; this state is a dynamic state and only active while the
0
1
0
3F hex
Off
Off
magnet is moving away from the chip. Magnitude register may change but
regulates back to 3F hex.
Distance decrease; this state is a dynamic state and only active while the
1
0
0
3F hex
Off
Off
magnet is moving towards the chip. Magnitude register may change but
regulates back to 3F hex.
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