MA732 – 14-BIT, DIGITAL ANGLE SENSOR WITH ABZ & PWM OUTPUTS

MA732 Rev. 1.1

MonolithicPower.com

21

8/8/2022

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Figure 22: Relationship 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 23).

Figure 23: 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 19). For instance, Figure 23 shows an

arrangement in which the field along the sensor

Y direction is tangential and weaker. 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) (see Table

14).

Table 14: 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 the range defined by the lower (MGLT)

and upper magnetic field thresholds (MGHT)

(see Figure 24).

Figure 24: MGH and MGL Signals as a Function

of the Field Strength

MagHys, the typical hysteresis on the signals

MGH and MGL, is 6mT. The MGLT and MGHT

thresholds are coded on 3 bits and stored in

register 6 (see Table 15).

Table 15: 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 16).

Table 16: MGLT and MGHT Binary to mT

Relationship

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 7), and their logic state is

also given at digital output pins 11 and 16.

1

1.5

2

2.5

3

3.5

4

4.5

5

0

5

10

15

20

25

30

35

40

E (deg)