AS5040 datasheet(22/28 Pages) AMSCO

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AS5040 10-BIT PROGRAMMABLE MAGNETIC ROTARY ENCODER

Revision 1.6, 03-Oct-06

www.austriamicrosystems.com

Page 22 of 28

16.4 Magnetic Input Specification

(operating conditions: Tamb = -40 to +125°C, VDD5V = 3.0-3.6V (3V operation) VDD5V = 4.5-5.5V (5V operation) unless otherwise noted)

Two-pole cylindrical diametrically magnetised source:

Parameter

Symbol

Min

Typ

Max

Unit

Note

Diameter

dmag

Thickness

tmag

2.5

Recommended magnet: Ø 6mm x 2.5mm for

cylindrical magnets

Magnetic input field amplitude

Bpk

Required vertical component of the magnetic field

strength on the die’s surface, measured along a

concentric circle with a radius of 1.1mm

Magnetic offset

Boff

± 10

Constant magnetic stray field

Field non-linearity

Including offset gradient

fmag_abs

Absolute mode: 600 rpm @ readout of 1024

positions (see table 6)

Input frequency

(rotational speed of magnet)

fmag_inc

166

Incremental mode: no missing pulses at rotational

speeds of up to 10,000 rpm (see table 6)

0.25

Max. X-Y offset between defined IC package

center and magnet axis (see Figure 20)

Displacement radius

Disp

0.485

Max. X-Y offset between chip center and magnet

axis.

Chip placement tolerance

±0.235

Placement tolerance of chip within IC package

(see Figure 22)

-0.12

NdFeB (Neodymium Iron Boron)

Recommended magnet

material and temperature drift

-0.035

%/K

SmCo (Samarium Cobalt)

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