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AS5030

Datasheet - Detailed Descri p ti on

The minimum PWM pulse width tON (PWM = high) is 1 LSB @ 0° (Angle reading = 00H).

1LSB = nom. 2.26µs.

The PWM pulse width increases with 1LSB per step. At the maximum angle 358.6° (Angle reading = FFH),

the pulse width tON (PWM = high) is 256 LSB and the pause width tOFF (PWM = low) is 1 LSB.

This leads to a total period (tON + tOFF) of 257LSB.

This means that the PWM pulse width is (position + 1) LSB, where position is 0….255.

The tolerance of the absolute pulse width and -frequency can be eliminated by calculating the angle with the duty cycle rather than with the

absolute pulse width:

(EQ 1)

results in an 8-bit value from 00H to FFH,

(EQ 2)

results in a degree value from 0° ~ 358.6°

Note:

The absolute frequency tolerance is eliminated by dividing tON by (tON+TOFF), as the change of the absolute timing effects both TON

and TOFF in the same way.

Table 6. SSI Read-only Serial Bit Sequence (21-bit read)

Position

Angle

High

t_high

Low

t_low

Duty-Cycle

0°

2.26µs

256

578.56µs

0.39%

127

178.59

128

287.02µs

129

291.54µs

49.4%

128

180°

129

291.54µs

128

287.02µs

50.2%

255

358.59°

256

578.56µs

2.26µs

99.6%

128

255

Position

2. 26 µs

291. 54 µs

578. 56 µs

2. 26 µs

287. 02 µs

578. 56 µs

ton

toff

PWM out

[]

257

−













−

OFF

bit

angle

[]













−













257

256

360

OFF

angle

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