AS5046 12-BIT PROGRAMMABLE MAGNETIC ROTARY ENCODER
Demoboard Operation Manual
Revision 1.1, 3-Jun-08 www.austriamicrosystems.com
Page 10 of 21
External Reference:
The default DAC reference is the voltage at pin #16 (VDD5V) divided by 2. Using this reference, a system that has an output
voltage ratiometric to the supply voltage can be built. Optionally, an external reference source, applied at pin#9 (DACref) can
be used.
RefExtEN
Output
Note
0
Voltage at pin 16 (VCC5V)
default mode
1
Voltage at pin 9 (DACref)
OPAMP Feedback:
The output is ratiometric to the supply voltage (VDD5V), which can range from 3.0V to 5.5V. If the DAC reference is switched
to an external reference (pin DACref), the output is ratiometric to the external reference.
FB_intEn
Feedback
Note
0
external
External resistors required at pin 11
and pin 12. (see Page 17)
1
internal
Op-Amp gain fixed at 2
Demoboad default (programmed)
Alarm Disable:
It is possible to enable the analog output permanently (it will not be switched off even if the magnetic field is out of range). To
enable this feature an OTP bit in the factory setting (FS6) must be set. By checking “Alarm Disable” this bit is set.
3.3.4
Zero Position Tab
This tab allows you to set an individual zero position or counter-clockwise operation temporarily by modifying the according
OTP bits (Z0…Z9, CCW). When applying a programming voltage of 7.5 to 8 Volts to pin PROG (see next page) and clicking
“permanent write”, those bits can be programmed permanently (see Figure 8).
Figure 8:
Zero position programming
