AS5046 12-BIT PROGRAMMABLE MAGNETIC ROTARY ENCODER
Demoboard Operation Manual
Revision 1.1, 3-Jun-08 www.austriamicrosystems.com
Page 2 of 21
Figure 2:
AS5046 demoboard
2
Operating the AS5046 Demoboard
The AS5046 demoboard can be used in several ways:
As standalone unit supplied by a 9V-battery
Connect a 9V…12V supply to pins "GND" and "+9V" at the 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 AS5046 demoboard software
This configuration uses the same USB hardware connection as above, but additionally the AS5046 demoboard software
is running. All indicators on the demoboard will be displayed on the PC screen as well.
Hardware Indicators
Refer to Figure 2:
2.1.1
7-Segment Display
The 4-digit display shows the absolute angle position of the magnet as a 10bit digital word (0…4095). Each digit corresponds
to (360/4096) = 0.35 degrees.
Note: The absolute position is monitored continuously. It does not require moving the magnet to a zero position before it can
calculate the absolute position. When power is lost (e.g. when you unplug the demoboard and re-connect it), it will instantly
display the correct position.
2.1.2
MagRng LED
The AS5046 provides several options of detecting movement and distance of the magnet in the vertical (Z-) direction. Signal
indicators MagINC, MagDEC and LIN are available as status bits in the serial data stream, while MagRngn is an open-drain
output that indicates an out-of range status (on in YELLOW or RED range).
2.2
Connectors
2.2.1
USB Connector
The USB connector is used to supply the demoboard with 5V power and as an interface to the AS5046 demo software, if it is
used.
2.2.2
8-pin Male Connector (left side on demoboard)
This connector is used to connect an external AS5046 encoder that can be displayed, modified and permanently
programmed with the AS5046 demoboard software (see Figure 11). It also fits the AS5046 adapter PCB (see Figure 2 and
Figure 12), which is available separately.
2.2.3
3-pin Male Connector (right side on demoboard)
This connector is used to connect an external supply (pins +9V, GND) for standalone operation, in case the USB connector
is not used. Vzapp is the connector for the programming voltage for permanently programming the external AS5046 (OTP).
2.2.4
5-pin Male Connector (right side on demoboard)
•
Vout: OPAMP analog output.
•
DACref: Optionally, an external reference source, applied at DACref can be used. This programming option is
useful for applications requiring a precise output voltage that is independent of supply fluctuations, for current sink
outputs or for applications with a dynamic reference, e.g. attenuation of audio signals.
•
FB: Per default, the gain of the Op-Amp is internally fixed at 2x. Optionally, the internal gain setting resistors may
be switched off , allowing an external gain setting with two resistors at pins Vout ( pin #12, Op-Amp output) and FB
(pin #11, inverting input).
•
Ground and VDD3V3
