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AS5311
Datasheet - D e t a i l e d D e s c r i p t i o n
Table 13. Magnetic Field Strength Red-Yellow-Green Indicators
Status Bits
MAG
Hardware Pins
1
MagINC MagDEC
LIN
M11…M4 MagINCn MagDECn
Description
1
1
1
1
0
1
20 hex-
5F hex
<20 hex
>5F hex
On
On
Off
On
YELLOW range: magnetic field is ~3.4…54.5mT.
The AS5311 may still be operated in this range, but with slightly reduced
accuracy.
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)
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)
( t on + t off ) ? 1
Position =
t on ? 4098
for digital position = 0 – 4094
Exception: A linear position of 1999.5μm = digital position 4095 will generate a pulse width of t on = 4097μs and a pause t off = 1μs
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.
www.ams.com/AS5311
Revision 1.12
15 - 29
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