AS5311 Demoboard OPERATIONAL MANUAL
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.
-
LEDs MagINC and MagDEC OFF, the magnet is correctly positioned
LCD indicator
-
LED MagINC ON and MagDEC OFF, magnet too close or too far, reduced accuracy
LCD indicator
U
-
LEDs MagINC and MagDEC ON, magnet too close or too far , values not valid and display stopped
LCD indicator
±
3.1.5
Encoder selection switch
The switch SW1 selects the encoder which communicates with the microcontroller through the SSI bus (Absolute position):
1.
INT (Bottom position, default):
Onboard AS5311
2.
EXT (Top Position):
External AS5311 connected on J6
The signals of the synchronous serial interface (DO, CLK, CSn) and the power supply (3.3V, GND) of an
external device can be connected directly to J6. In this configuration, the data of the serial interface (absolute
position) are displayed on the GUI or the LCD.
If the incremental AB position of the external encoder is used, remove the jumpers P1 and P2 (bottom side of the board), and
connect the AB signals from the encoder to the jumpers as shown on figure 3 below.
Serial
Outputs
(absolute)
Demoboard switched to external
encoder mode
Demoboard TOP view
Incremental
Outputs
(Relative)
Demoboard BOTTOM view
Figure 3: external AS5311 connection to the demoboard (top and bottom view)
Revision 1.0, 03 April 2009 www.austriamicrosystems.com
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