AS5046 Programmable 360° Magnetic Angle Encoder – Preliminary Data Sheet

Revision 1.1

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Page 8 of 33

5.7

Programming Conditions

otherwise noted)

Parameter

Symbol

Min

Typ

Max

Unit

Note

Programming enable time

2

µs

Time between rising edge at Prog

pin and rising edge of CSn

Write data start

2

µs

Write data valid

250

ns

Write data at the rising edge of

Load programming data

3

µs

0

µs

0

5

µs

250

kHz

CLK pulse width

1.8

2

2.2

µs

During programming; 16 clock cycles

Hold

time

of

Vprog

after

programming

2

µs

Programmed data is available after

next power-on

Programming voltage

7.3

7.4

7.5

V

Must be switched off after zapping

Programming voltage off level

0

1

V

Line must be discharged to this level

Programming current

130

mA

During programming

Analog read CLK

100

kHz

Analog readback mode

Programmed zener voltage (log.1)

100

mV

1

V

mode (see 13)

6 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.