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AS5132

Datasheet - Detailed Descri p ti on

Figure 20. Dynamic and Static Pre-Commutation

7.3.5 Hysteresis of the Incremental Outputs

A hysteresis is implemented to get a stable output value at the SSI command and to reduce jitter at the PWM and UVW outputs. At start up the

hysteresis counter is at 0, the range is ±1 LSB. The hysteresis can be deactivated by setting OTP bit Hyst_dis.

Figure 21. Hysteresis of the Outputs

120

180

2 pole pairs, Counter Clockwise rotation

electrical angle

mechanical angle

0

60

180

240

300

60

120

0

2 pole pairs, Clockwise rotation

electrical angle

mechanical angle

0

60

180

240

300

60

120

180

120

0

30

90

120

150

210

240

270

60

0

180

Dynamic pre-commutation 0x00 … 0x3F

Static pre-commutation 0x00...0x06

Dynamic pre-commutation 0x00 … 0x3F

Static pre-commutation 0x00… 0x06

0

30

90

120

150

210

240

270

60

180

U

V

W

U

V

W

Effect of Hysteresis

CW rotation

CCW rotation

0

Magnet Position

Angle Output

123456

0

1

2

3

4

5

-1

0

1

Hysteresis counter startup value

Counter Range: 3 LSB