ams AG AS5132 Betriebshandbuch - Seite 3
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Seite druckenAS5132 Demoboard OPERATIONAL MANUAL
3 Operating the AS5132 Demoboard
The AS5132 demoboard can be used in several ways:
As standalone unit supplied by a 9V battery
•
Connect a 9V battery to the battery connector on the top right side of the board. No other connections are required.
As standalone unit supplied by an USB port
•
Connect the demoboard to a PC using a USB/USB cable (included in demoboard shipment). The board is supplied by
the 5V supply of the USB port. No other connections are required.
As input device for the AS5000 Programmer GUI software
•
This configuration uses the same USB hardware connection as above, but additionally the AS5000 Programmer GUI
software is running. The LCD display will be turned off and the Angle/Multiturn/AGC will be displayed on the PC screen.
Some extra features as pole pair, zero position or AGC programming can be achieved. The parameters will not be
permanently programmed. All the parameters will be lost when the demoboard is shut down Hardware Indicators
3.1.1
Graphic LCD display
The LCD display shows the realtime absolute angle position of the magnet as a 8.5bit digital word (0...360).
Turning the knob clockwise will increase the angle value until 359, then 0.
The Multiturn counter register will increment at each 359°0° transition, and will decrease at each 0°359° transition
(counter clockwise). The Multiturn (MTURN) value is continuously read from the AS5132 Multiturn register.
The AGC value is continuously updated as well.
The magnet status indicator depends on the AGC value. If AGC = 0, the magnet it too close to the encoder. If AGC =
31, the magnet is too far away from the encoder (maximum AGC value).
AGC indicator
0 (magnet too close) ~
31 (magnet too far)
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 AS5132. The PWM output is a pulse width that is proportional to the
angle of the magnet.
The pulse width varies from 16μs to 734μs with a repetition rate of 1.33 kHz. Viewing the PWM signal on the LED
results in a 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 16μs on and 734μs 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 (0-5V) can be directly taken from the connector J4.
3.1.3
UVW commutation LED
The UVW commutation signals are used to control the electrical angle information of a BLDC motor (see AS5134
Datasheet Figure 10).
The UVW LEDs are directly connected to the U V W outputs of the AS5134. These UVW signals (0-5V) are available on
connector J7.
Revision 1.0, 04-April-2012
www.austriamicrosystems.com
Magnet angle value in
degree
Multiturn counter register
-255 ~ +255
Raw angle value and
bargraph from SSI
Is the same value as the
angle in degree (1°/step)
From 0 to 359
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