AS5040 datasheet(14/28 Pages) AMSCO

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AS5040 10-BIT PROGRAMMABLE MAGNETIC ROTARY ENCODER

Revision 1.6, 03-Oct-06

www.austriamicrosystems.com

Page 14 of 28

LDO

1...10µF

100n

4.5 - 5.5V

Prog

Index_W

B_Dir_V

A_LSB_U

CLK

PW M_LSB

VDD3V3

VSS

VDD5V

5V Operation

Internal

VDD

CSn

LDO

100n

3.0 - 3.6V

VDD3V3

VSS

VDD5V

3.3V Operation

Internal

VDD

Prog

Index_W

B_Dir_V

A_LSB_U

CLK

PW M_LSB

CSn

Figure 18: Connections for 5V / 3.3V supply voltages

A buffer capacitor of 100nF is recommended in both

cases close to pin VDD5V. Note that pin VDD3V3 must

always be buffered by a capacitor. It must not be left

floating, as this may cause an instable internal 3.3V

supply voltage which may lead to larger than normal jitter

of the measured angle..

12 Choosing the Proper Magnet

Typically the magnet should be 6mm in diameter and

≥2.5mm in height. Magnetic materials such as rare earth

AlNiCo, SmCo5 or NdFeB are recommended.

The magnet’s field strength perpendicular to the die

surface should be verified using a gauss-meter. The

magnetic field Bv at a given distance, along a concentric

circle with a radius of 1.1mm (R1), should be in the range

of ±45mT…±75mT. (see Figure 19).

Magnet axis

Vertical field

component

(45…75mT)

360

Vertical field

component

R1 concentric circle;

radius 1.1mm

Magnet axis

typ. 6mm diameter

Figure 19: Typical magnet and magnetic field distribution

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