AS5046 12-BIT PROGRAMMABLE MAGNETIC ROTARY ENCODER
Demoboard Operation Manual
Revision 1.1, 3-Jun-08 www.austriamicrosystems.com
Page 15 of 21
3.6
Connecting the AS5046 Adapter PCB to the Demoboard
Figure 12:
AS5046 adapter PCB: top and bottom view
Note: further information about the AS5046 adapter PCB is available in a separate document:
"AS5046 Adapter PCB Operation Manual".
The AS5046 adapter PCB is intended as a standalone device that allows easy and quick testing of the AS5046 without the
need of having to make your own PCB.
It allows access to each IC pin via a standard 100mil pitch, 600mil Dual-In-Line connector, has LEDs on all digital outputs
and comes with an onboard 5V linear voltage regulator (78L05) and a battery clip to supply the board from a 9V battery.
The 7-pin female connector is designed to fit directly onto the AS5046 demoboard and use the adapter PCB as external
encoder (software setting: Encoder = external).
The demoboard however, runs at 3.3V supply voltage. The adapter PCB is configured for 5V supply voltage. Connecting
both boards without modifications will not harm any of the boards, but may lead to data transmission errors due to the
different digital levels, especially when an extension cable is used between demoboard and adapter PCB.
If you use the adapter PCB as external encoder for the AS5046 demoboard with an extension cable or experience data
transmission errors, it is recommended to configure the adapter PCB for 3.3V supply voltage. (see Figure 11)
Perform the following modifications:
disconnect the 5V supply between demoboard and adapter PCB: cut off pin "+5VUSB" at the bottom of the AS5046
demoboard
connect pins "3V3" and "5V" (see component print) on the adapter PCB. Ideally, connect the pins right at the bottom of
the 7-pin female connector with a piece of wire or solder joint.
you may also remove the 78L05 voltage regulator from the adapter PCB to prevent accidental damage of the IC when
an input voltage is applied to the regulator (and the 5V output is fed to the VDD3V3 supply pin)
