MAQ430 – 12-BIT, AUTOMOTIVE ANGLE SENSOR WITH ABZ & UVW OUTPUTS

MAQ430 Rev. 1.2

www.MonolithicPower.com

21

8/8/2022

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1

1.5

2

2.5

3

3.5

4

4.5

5

0

5

10

15

20

25

30

35

40

E (deg)

Figure 19: Relation between the Error Measured

with BCT = 0 and the Magnet Ratio k

Sensor Orientation

The dot marked on the package shows whether

the radial field is aligned with the sensor

coordinate X or Y (see Figure 20).

Figure 20: Package Top View with X and Y Axes

Determine which axis needs to be reduced (see

the qualitative field distribution around a ring in

Figure 16). For instance, with the arrangement

depicted in Figure 20, the field along the sensor

Y direction is tangential and weaker. Therefore,

the X-axis should be reduced (ETX = 1 and

ETY = 0). Note that if both ETX and ETY are

set to 1, the current bias is reduced in both

directions the same way (i.e.: without side-shaft

correction).

Table 12: Trimming Direction Parameters

ETX

Enable Trimming of the X-Axis

0

Disabled

1

Enabled

ETY

Enable Trimming of the Y-Axis

0

Disabled

1

Enabled

Magnetic Field Thresholds

The magnetic flags (MGL and MGH) indicate

that the magnetic field at the sensor position is

out of range, defined by the lower and upper

magnetic field thresholds, respectively MGLT

and MGHT (see Figure 21).

Figure 21: MGH and MGL Signals as a Function

of the Field Strength

MagHys, the typical hysteresis on the signals

MGH and MGL, is 6mT (see Figure 24). The

MGLT and MGHT thresholds are coded on

three bits and stored in register 6 (see Table

13).

Table 13: Register 6

Register 6

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

MGLT

MGHT

-

-

The

3-bit

values

of

MGLT

and

MGHT

correspond to the magnetic field (see Table 14).

Table 14: MGLT and MGHT Binary to mT Relation

MGLT or

MGHT (8)

Field threshold in mT (7)

From low to high

magnetic. field

From high to low

magnetic. field

000

26

20

001

41

35

010

56

50

011

70

64

100

84

78

101

98

92

110

112

106

111

126

120

NOTES:

7)

Valid for VDD = 3.3V. If different, then the field threshold is

scaled by the factor VDD/3.3V.

8)

MGLT can have a larger value than MGHT.

The alarm flags MGL and MGH can be read in

register 27 (bit 6 and bit 7), and their logic state