austriamicrosystems AS5040 Manuel d'utilisation - Page 2
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3.1
Hardware Indicators and Connectors
3.1.1
Graphic LCD display
The LCD display shows the realtime absolute angle position of the magnet with a resolution of 0.35° = 1024 positions
per revolution (AS5X40) and the absolute value of the angle.
Turning the knob clockwise will increase the angle value until 359,6 then 0.
The magnet status indicator is related to the magnet position. If the magnet is too close to the encoder, "Magnet too
close" will be displayed. If the magnet is too far away from the encoder, "Magnet out of range" will be displayed.
Magnet indicator:
- OK (distance OK)
- Magnet out of range
Bargraph representation of
the angle (0° to 359.6°)
Figure 2: LCD display in standalone mode (9V battery or USB powered without GUI)
3.1.2
PWM LED
This LED is connected to the PWM output of the AS5X40. The PWM output is a pulse width that is proportional to the
angle of the magnet.
The pulse width varies from 1µs to 1024µs with a repetition rate of 1.0 kHz. Viewing the PWM signal on the LED results
in brightness, that is proportional to the angle of the magnet. When the angle of the magnet is at 0°, the LED is almost
dark, as it is 1µs on and 1023µs off. Turning the knob clockwise towards higher angles increases the brightness of the
PWM LED, since the ON-pulse becomes longer and the OFF-pulse becomes shorter.
Likewise, the PWM output can be used as an analog output proportional to the angle, when the PWM signal is filtered
by a RC (or active) lowpass filter.
The PWM signal (0 ~ 3V3) can be directly taken from the connector J4.
3.1.3
Incremental quadrature AB-Index LED
The phase shift between channel A and B indicates the direction of the magnet movement. Channel A leads channel B
at a clockwise rotation of the magnet (top view) by 90 electrical degrees. Channel B leads channel A at a counter
clockwise rotation.
One Index pulse (3V3) is generated at the angle 0 (see AS5X40 datasheet Figure 9)
The AB-Index LEDs are directly connected to the A B Index outputs of the AS5X40. These quadrature signals (0 – 3V3)
are available on connector J7.
3.1.4
MagINCn and MagDECn
MagINCn and MagDECn are the magnetic field change indicators (magnetic field strength increase or decrease through
variation of the distance between the magnet and the device).
These outputs can be used to detect the valid magnetic field range. If both indicators lit simultaneously
(MagINCn = 0 and MagDECn = 0), the magnet is out of range, the airgap between the encoder and the magnet is too
high or too low. In that case, "Magnet out of range" will be displayed on the LCD display.
Revision 1.0, 29-Jan-2009
www.austriamicrosystems.com
Absolute angle value
10 bit resolution: 0 to 1023
Magnet angle value:
From 0 to 359.6°
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