AS5030ATST datasheet(12/33 Pages) AMSCO

12 / 33 page

AS5030 8-bit Programmable Magnetic Rotary Encoder

Rev. 1.8

www.austriamicrosystems.com

Page 12 of 33

4.18 1-Wire PWM Connection

This configuration uses the least number of wires: only one line

(PWM) is used for data, leaving the total number of connection

to three, including the supply lines. This type of configuration

is especially useful for remote sensors.

Ultra Low Power Mode is not possible in this configuration, as

there is no bi-directional data transmission.

If the AS5030 angular data is invalid, the PWM output will

remain at low state. Pins that are not shown may be left open.

Note that the PWM output is invalid when the AGC is disabled

(see 5.2.2).

Figure 13: Data transmission with pulse width modulated (PWM) output

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.

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%

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:

[]

257

−

⎟⎟

⎠

⎞

⎜⎜

⎝

⎛

−

OFF

bit

angle

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

[]

⎥

⎦

⎤

⎢

⎣

⎡

−

⎟⎟

⎠

⎞

⎜⎜

⎝

⎛

257

256

360

OFF

angle

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.

AS5030

Micro

Controller

100n

PWM

+5V

VDD

VSS

VDD

VSS

Input

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