AS5046-ASST austriamicrosystems, AS5046-ASST Datasheet - Page 14

• 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
8 Functional Description
The AS5046 is manufactured in a CMOS standard process and uses a spinning current Hall technology for sensing
the magnetic field distribution across the surface of the chip.
The integrated Hall elements are placed in a circle around the center of the device and deliver a voltage
representation of the magnetic field perpendicular to the surface of the IC.
Through Sigma-Delta Analog / Digital Conversion and Digital Signal-Processing (DSP) algorithms, the AS5046
provides accurate high-resolution absolute angular position information. For this purpose a Coordinate Rotation
Digital Computer (CORDIC) calculates the angle and the magnitude of the Hall array signals.
The DSP is also used indicate movements of the magnet towards or away from the chip and to indicate, when the
magnetic field is outside of the recommended range (status bits = MagInc, MagDec; hardware pin = MagRngn). In
addition, two 8-bit registers are available that allow determination of the magnetic field strength over a wide range.
A small low cost diametrically magnetized (two-pole) standard magnet, centered over the chip, is used as the input
device.
The AS5046 senses the orientation of the magnetic field and calculates a 12-bit binary code. This code can be
accessed via a bi-directional serial two-wire interface. In addition to the digital output, the absolute angle is converted
into a 1024-step (10-bit) analog signal, ratiometric to the supply voltage.
The analog output can be configured in many ways, such as 360°/180°/90° or 45° angular range, external or internal
DAC reference voltage, 0-100%*VDD or 10-90% *VDD analog output range, external or internal amplifier gain setting.
The various output modes as well as a user programmable zero position can be programmed in an OTP register. As
long as no programming voltage is applied to pin PROG, the new setting may be overwritten at any time and will be
reset to default when power is cycled. To make the setting permanent, the OTP register must be programmed by
applying a programming voltage.
The AS5046 is tolerant to magnet misalignment and unwanted external magnetic fields due to differential
measurement technique and Hall sensor conditioning circuitry.
It is also tolerant to airgap and temperature variations due to Sin-/Cos- signal evaluation.
9 3.3V / 5V Operation
Figure 5 Connections for 5V / 3.3V Supply Voltages
The AS5046 operates either at 3.3V ±10% or at 5V ±10%. This is made possible by an internal 3.3V Low-Dropout
(LDO) Voltage regulator. The core supply voltage is always taken from the LDO output, as the internal blocks are
always operating at 3.3V.For 3.3V operation, the LDO must be bypassed by connecting VDD3V3 with VDD5V (see
Figure 5).
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4.5 - 5.5V
5V Operation
100n
VDD5V
VSS
LDO
VDD3V3
VSS (Slow) or
VDD5V (Fast)
2µ2...10µF
Internal
VDD
N
R
C
T
E
F
A
E
I
Mode
DO
MODE
VSS (Slow)
VDD5V (Fast)
CLK
CSn
Prog
Revision 1.12
3.0 - 3.6V
3.3V Operation
VDD5V
VSS
LDO
VDD3V3
Internal
VDD
N
R
C
T
E
F
A
E
I
DO
CLK
CSn
Prog
MODE
VSS (Slow)
VDD5V (Fast)
100n
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