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AS5311

Datasheet - D e t a il e d D es c r i pt io n

7.6 Pulse Width Modulation (PWM) Output

The AS5311 provides a pulse width modulated output (PWM), whose duty cycle is proportional to the relative linear position of the magnet within

one pole pair (2.0mm). This cycle repeats after every subsequent pole pair:

(EQ 1)

for digital position = 0 – 4094

The PWM frequency is internally trimmed to an accuracy of ±5% (±10% over full temperature range). This tolerance can be cancelled by

measuring the complete duty cycle as shown above.

11

0

20 hex-

5F hex

On

Off

YELLOW range: magnetic field is ~3.4…54.5mT.

The AS5311 may still be operated in this range, but with slightly reduced

accuracy.

11

1

<20 hex

>5F hex

On

On

RED range: magnetic field is <3.4mT (MAG <20) or >54.5mT (MAG >5F).

It is still possible to operate the AS5311 in the red range, but not

recommended.

All other combinations

n/a

n/a

Not available

1. Pin 2 (MagINCn) and Pin 3 (MagDECn)

Table 13. Magnetic Field Strength Red-Yellow-Green Indicators

Status Bits

MAG

Hardware Pins

1

MagINC MagDEC

LIN

M11…M4 MagINCn MagDECn

Description

4098 −

+

⋅

=

off

on

on

t

t

t

Position