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

MAQ430 Rev. 1.2

www.MonolithicPower.com

25

8/8/2022

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Figure 26: UVW Output for One Pole Pair Rotor

during Rotation

If the number of pole pairs of the motor exceeds

the number of pole pairs of the target magnet,

the MAQ430 is able to generate more than one

UVW cycle per revolution. It does this by

dividing the digital angle into the required

number

of

commutation

steps

per

360°

revolution. The parameter NPP(2:0) in register

0x7 sets the number of pole pairs emulated,

and the corresponding commutation step angle

for the UVW signals. Table 18 describes the

pole pair configuration options.

Table 18: Number of UVW Pair Poles

NPP

(2:0)

Pole

Pairs

States per

Revolution

State Width

(deg)

000

1

6

60

001

2

12

30

010

3

18

20

011

4

24

15

100

5

30

12

101

6

36

10

110

7

42

8.6

111

8

48

7.5

An example of the 30° UVW commutation

signal spacing for a four-pole (two-pole pair)

motor is shown in Figure 27.

Figure 27: UVW Commutation Signals for a Four-

Pole (Two-Pole Pair) Motor

UVW Hysteresis

A hysteresis larger than the output noise is

introduced on the UVW output to avoid any

spurious transitions (see Figure 28).

Figure 28: Hysteresis of the UVW Signal