AS5043 Programmable 360° Magnetic Angle Encoder
Revision 1.4, 04-Apr-06
Page 5 of 26
MagInc, (Magnitude Increase) becomes HIGH, when the
magnet is pushed towards the IC, thus the magnetic field
strength is increasing.
MagDec, (Magnitude Decrease) becomes HIGH, when
the magnet is pulled away from the IC, thus the magnetic
field strength is decreasing.
Both signals HIGH indicate a magnetic field that is out of
the allowed range (see Table 3).
Note: Pin 1 (MagRngn) is a combination of MagInc and
MagDec. It is active low via an open drain output and
requires an external pull-up resistor. If the magnetic field
is in range, this output is turned off. (logic “high”).
Even Parity bit for transmission error detection of bits
1…15 (D9…D0, OCF, COF, LIN, MagInc, MagDec)
The absolute angular output is always set to a resolution
of 10 bit / 360°. Placing the magnet above the chip,
angular values increase in clockwise direction by default.
t DO active
t DO Tristate
t CLK FE
t DO valid
t CLK FE
T CLK / 2
Angular Position Data
Figure 5: Synchronous serial interface with absolute angular position data
Z-Axis Range Indication (Push Button Feature, Red/Yellow/Green Indicator)
The AS5043 provides several options of detecting
movement and distance of the magnet in the vertical (Z-)
direction. Signal indicators MagINC, MagDEC and LIN
are available as status bits in the serial data stream,
while MagRngn is an open-drain output that indicates an
out-of range status (on in YELLOW or RED range).
Additionally, the analog output provides a safety feature
in the form that it will be turned off when the magnetic
field is too strong or too weak (RED range).
The serial data is always available, the red/yellow/green
status is indicated by the status bits as shown below:
SSI Status bits
No distance change
Magnetic Input Field OK (GREEN range, ~45…75mT)
Distance increase, GREEN range; Pull-function. This state is dynamic and only active while the magnet is
moving away from the chip.
Distance decrease, GREEN range; Push- function. This state is dynamic and only active while the magnet is
moving towards the chip.
YELLOW Range: Magnetic field is ~ 25…45mT or ~75…135mT. The AS5043 may still be operated in this
range, but with slightly reduced accuracy.
RED Range: Magnetic field is ~<25mT or >~135mT. The analog output will be turned off in this range by
default. It can be enabled permanently by OTP programming (see 11.1.2).
It is still possible to use the absolute serial interface in the red range, but not recommended.
Table 3: Magnetic field strength indicators