AS5046 Programmable 360° Magnetic Angle Encoder – Preliminary Data Sheet

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9.7

Z-Axis Range Indication (Push Button Feature, Red/Yellow/Green Indicator

The AS5046 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:

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 AS5046 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 7: Magnetic field strength indicators

10 Mode Input Pin

The absolute angular position is sampled at a rate of 10.4kHz (t=96µs) in fast mode and at a rate of 2.6kHz (t=384µs) in

slow mode.

These modes are selected by pin MODE (#2). The mode input pin activates or deactivates an internal filter, which is used to

reduce the digital jitter and consequently the analog output noise.

Activating the filter by pulling Mode = LOW or leaving it open reduces the transition noise to <0.03° rms. At the same time,

the sampling rate is reduced to 2.6kHz and the signal propagation delay is increased to 384µs. This mode is recommended

for high precision, low speed and ≤360° applications.

Deactivating the filter by setting Mode = HIGH increases the sampling rate to 10.4kHz and reduces the signal propagation

delay to 96µs. The transition noise will increase to <0.06° rms. This mode is recommended for higher speed and full scale =

360° applications.

Parameter

Symbol

Min

Typ

Max

Unit

Note

Input Field tolerance level red2yellow B1 - B2

16.77

17.95

19.33

mT

Input Field tolerance level yellow2green B3 - B4

33.01

35.35

38.06

mT

Input Field tolerance level green2yellow B5 - B6

60.0

64.24

69.15

mT

Input Field tolerance level yellow2red B7 – B8

90.45

96.87

104.28

mT

At 25°C ambient

temperature

Input Field tolerance level red2yellow B1 - B2

15.64

17.95

22.37

mT

Input Field tolerance level yellow2green B3 - B4

30.80

35.35

44.05

mT

Input Field tolerance level green2yellow B5 - B6

55.96

64.24

80.04

mT

Input Field tolerance level yellow2red B7 – B8

84.39

96.87

120.69

mT

Over the full

specified

temperature range