AS5045

Data Sheet

www.austriamicrosystems.com

Revision 1.7

14 – 33

8.1.1

Data Content

D11:D0 absolute angular position data (MSB is clocked out first)

OCF

(Offset Compensation Finished), logic high indicates the finished Offset Compensation Algorithm

COF

(Cordic Overflow), logic high indicates an out of range error in the CORDIC part. When this bit is set, the data

at D9:D0 is invalid. The absolute output maintains the last valid angular value.

This alarm may be resolved by bringing the magnet within the X-Y-Z tolerance limits.

LIN

(Linearity Alarm), logic high indicates that the input field generates a critical output linearity.

When this bit is set, the data at D9:D0 may still be used, but can contain invalid data. This warning may be resolved

by bringing the magnet within the X-Y-Z tolerance limits.

Even Parity

bit for transmission error detection of bits 1…17 (D11…D0, OCF, COF, LIN, MagINC, MagDEC)

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:

Table 3.

Status Bit Outputs

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

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

8.1.2

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:

Table 4.

Magnetic Field Strength Variation Indicator

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

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: