AS5311

Data Sheet

www.austriamicrosystems.com

Revision 1.01

10 - 23

6.6.2

Pulse Width Modulation Output

otherwise noted.

Parameter

Symbol

Min

Typ

Max

Unit

Note

232

244

256

Signal period = 4098µs

±5% at Tamb =

25°C

PWM frequency

f PWM

220

244

268

Hz

= 4098µs

±10% at Tamb = -40 to +125°C

Minimum pulse width

PW MIN

0.9

1

1.1

µs

Position 0d =0µm

Maximum pulse width

PW MAX

3892

4097

4301

µs

Position 4095d = 1999.5µm

7

Detailed Description

The different types of outputs relative to the magnet position are outlined in Figure 5 below.

The absolute serial output counts from 0….4095 within one pole pair and repeats with each subsequent pole

pair.

Likewise, the PWM output starts with a pulse width of 1µs, increases the pulse width with every step of 0.488µm

and reaches a maximum pulse width of 4097µs at the end of each pole pair.

An index pulse is generated once for every pole pair.

256 incremental pulses are generated at each output A and B for every pole pair. The outputs A and B are

phase shifted by 90 electrical degrees, which results in 1024 edges per pole pair. As the incremental outputs are

also repeated with every pole pair, a constant train of pulses is generated as the magnet moves over the chip.

Figure 5: AS5311 Outputs Relative to Magnet Position