AS5046-ASST austriamicrosystems, AS5046-ASST Datasheet - Page 27

• Manufacturer Part Number: AS5046-ASST
• Description: IC ENCODER PROG 12-BIT 16-SSOP
• Manufacturer: austriamicrosystems
• Type: Linear, Rotary Encoder - Programmabler

Specifications of AS5046-ASST

• Sensing Range: 45mT ~ 75mT
• Voltage - Supply: 3 V ~ 3.6 V, 4.5 V ~ 5.5 V
• Current - Supply: 21mA
• Current - Output (max): 4mA
• Output Type: Analog, Ratiometric
• Features: Programmable
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 16-SSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: AS5046-ASSTTR

AS5046
Data Sheet
15.1 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°).
Figure 16
15.2 Analog Mode Programming
The analog output can be configured in many ways:
It consists of three major building blocks,
In the default configuration (all OTP bits = 0), the analog output is set for 360° operation, internal DAC reference
(VDD5V/2), external OPAMP gain, 0-100% ratiometric to VDD5V.
Shown below is a typical example for a 0°-360° range, 0-5V output. The complete application requires only one
external component, a buffer capacitor at VDD3V3 and has only 3 connections VDD, VSS and Vout (connectors 1-3).
Note: the default setting for the OPAMP feedback path is:FB_intEn=0=external. The external resistors Rf and Rg must
be installed. In the programmed state (FB_intEn=1=internal), these resistors do not need to be installed as the
feedback path is internal (Rf_int and Rg_int).
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a digital range preselector,
a 10-bit Digital-to-Analog-Converter (DAC) and
an OP-AMP buffer stage.
Zero Position Programming (shown for 360° mode)
analog
output
voltage
VDD5V
2V
5V
0V
0°
90°
the output can be electrically rotated to
match a given output voltage to any
mechanical position
Revision 1.12
180°
270°
360°
mechanical
angle
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