AS5046ASST datasheet(21/33 Pages) AMSCO

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AS5046 Programmable 360° Magnetic Angle Encoder – Preliminary Data Sheet

Revision 1.1

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Page 21 of 33

Data

CSn

Prog

SCL

7.5V

VDD

tLoad PROG

tPROG finished

Write Data

Power Off

Programming Mode

tPROG

tPrgH

VProgOff

tPrgR

116

Figure 14: Complete OTP programming sequence

Figure 15: OTP programming hardware connection of AS5046 (shown with AS5046 demoboard)

12.1 Zero Position Programming

The AS5046 allows easy assembly of the system, as the

actual angle of the magnet does not need to be

considered. By OTP programming, any position can be

assigned as the new permanent zero position with an

accuracy of 0.35° (all modes).

Using the same procedure, the AS5046 can be calibrated

to assign a given output voltage to a given angle. With

this approach, all offset errors (DAC + OPAMP) are also

compensated for the calibrated position.

Essentially, for a given mechanical position, the angular

measurement system is electrically rotated (by changing

the Zero Position value in the OTP register), until the

output matches the desired mechanical position.

The example in Figure 16 below shows a configuration

for 5V supply voltage and 10%-90% output voltage

range. It adjusted by Zero Position Programming to

provide an analog output voltage of 2.0 Volts at an angle

of 180°. The slope of the curve may be further adjusted

by changing the gain of the OPAMP output stage and by

selecting the desired angular range (360°/180°/90°/45°).

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