AS5043 Programmable 360° Magnetic Angle Encoder

Revision 1.4, 04-Apr-06

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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.

Even

PAR

CSn

CLK

DO

D9

D8

D7

D6

D5

D4

D3

D2

D1

D0

18

16

COF

LIN

OCF

Ma g

IN C

Ma g

DEC

1

D9

Angular Position Data

Status Bits

Figure 5: Synchronous serial interface with absolute angular position data

8.2

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

Hardware Pins

Mag

INC

Mag

DEC

LIN

Mag

Rngn

Analog

output

Description

0

0

0

Off

enabled

No distance change

Magnetic Input Field OK (GREEN range, ~45…75mT)

0

1

0

Off

enabled

Distance increase, GREEN range; Pull-function. This state is dynamic and only active while the magnet is

moving away from the chip.

1

0

0

Off

enabled

Distance decrease, GREEN range; Push- function. This state is dynamic and only active while the magnet is

moving towards the chip.

1

1

0

On

enabled

YELLOW Range: Magnetic field is ~ 25…45mT or ~75…135mT. The AS5043 may still be operated in this

range, but with slightly reduced accuracy.

1

1

1

On

disabled

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