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AS5045
Data Sheet
8.1.1
Data Content
D11:D0 absolute angular position data (MSB is clocked out first)
OCF ( O ffset C ompensation F inished), logic high indicates the finished Offset Compensation Algorithm
COF ( C ordic O ver f low), 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
( Lin earity 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
1
0
0
0
1
1
0
Even checksum of bits 1:15
1*)
1*)
*) 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
0
0
1
1
Mag
DEC
0
1
0
1
Mag
INCn
Off
Off
On
On
Mag
DECn
Off
On
Off
On
Description
No distance change
Magnetic input field OK (in range, ~45…75mT)
Distance increase; pull-function. This state is dynamic and only active while
the magnet is moving away from the chip.
Distance decrease; push- function. This state is dynamic and only active
while the magnet is moving towards the chip.
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:
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