AS5045 12-BIT PROGRAMMABLE MAGNETIC ROTARY ENCODER

Revision 1.5

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Placing the magnet above the chip, angular values increase in clockwise direction by default.

Data D11:D0 is valid, when the status bits have the following configurations:

OCF

COF

LIN

Mag

INC

Mag

DEC

Parity

0

0

0

1

1

0

1

0

0

1*)

1*)

even

checksum of

bits 1:15

Table 3: Status bit outputs

*) MagInc=MagDec=1 is only recommended in YELLOW mode (see Table 5)

5.1.2

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

The AS5045 provides several options of detecting

movement and distance of the magnet in the Z-direction.

Signal indicators MagINCn and MagDECn are available both

as hardware pins (pins 1 and 2) and as status bits in the

serial data stream (see Figure 5). Additionally, an OTP

programming option is available with bit MagCompEn (see

Figure 10) that enables additional features:

In the default state, the status bits MagINC, MagDec

and pins MagINCn, MagDECn have the following function:

Status bits

Hardware pins

OTP: Mag CompEn = 0 (default)

Mag

INC

Mag

DEC

Mag

INCn

Mag

DECn

Description

0

0

Off

Off

No distance change

Magnetic input field OK (in range, ~45…75mT)

0

1

Off

On

Distance increase; pull-function. This state is dynamic and only active while the magnet is

moving away from the chip.

1

0

On

Off

Distance decrease; push- function. This state is dynamic and only active while the magnet is

moving towards the chip.

1

1

On

On

Magnetic field is ~<45mT or >~75mT. It is still possible to operate the AS5045 in this range, but

not recommended

Table 4: Magnetic field strength variation indicator

When bit MagCompEn is programmed in the OTP, the function of status bits MagINC, MagDec

and pins MagINCn, MagDECn is changed to the following function:

Status bits

Hardware pins

OTP: Mag CompEn = 1 (red-yellow-green programming option)

Mag

INC

Mag

DEC

LIN

Mag

INCn

Mag

DECn

Description

0

0

0

Off

Off

No distance change

Magnetic input field OK ( GREEN range, ~45…75mT)

1

1

0

On

Off

YELLOW range: magnetic field is ~ 25…45mT or ~75…135mT. The AS5045 may still

be operated in this range, but with slightly reduced accuracy.

1

1

1

On

On

RED range: magnetic field is ~<25mT or >~135mT. It is still possible to operate the

AS5045 in the red range, but not recommended.

All other combinations

n/a

n/a

Not available

Table 5: Magnetic field strength red-yellow-green indicator (OTP option)