as5040 austriamicrosystems, as5040 Datasheet - Page 5

• Manufacturer Part Number: as5040
• Description: 10-bit Programmable Magnetic Rotary Encoder
• Manufacturer: austriamicrosystems

AS5040 10-BIT PROGRAMMABLE MAGNETIC ROTARY ENCODER
3.4
(operating conditions: T
Two-pole cylindrical diametrically magnetised source:
3.5
(operating conditions: T
Revision 1.8
Parameter
Diameter
Thickness
Magnetic input field amplitude
Magnetic offset
Field non-linearity
Input frequency
(rotational speed of magnet)
Displacement radius
Chip placement tolerance
Recommended magnet
material and temperature drift
Parameter
Resolution
7 bit
8 bit
9 bit
10 bit
Integral non-linearity (optimum)
Integral non-linearity (optimum)
Integral non-linearity
Differential non-linearity
Transition noise
Hysteresis
On voltage; 300mV typ. hysteresis
Off voltage; 300mV typ. hysteresis
Power-on reset thresholds
Magnetic Input Specification
Electrical System Specifications
am b
am b
= -40 to +125°C, VDD5V = 3.0-3.6V (3V operation) VDD5V = 4.5-5.5V (5V operation) unless otherwise noted)
= -40 to +125°C, VDD5V = 3.0-3.6V (3V operation) VDD5V = 4.5-5.5V (5V operation) unless otherwise noted)
Symbol
f
f
mag_abs
Symbol
mag_inc
Disp
d
t
B
B
INL
mag
INL
mag
RES
DNL
Hyst
LSB
pk
off
INL
TN
V
V
temp
on
off
opt
Min
1,37
1.08
Min
2.5
45
4
2.813
1.406
0.703
0.352
0.704
Typ
2.2
1.9
-0.12
-0.035
Typ
6
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± 0.176
± 0.5
± 0.9
± 1.4
Max
0.12
2.9
2.6
10
±0.235
0.485
Max
± 10
0.25
500
75
10
5
Unit
RMS
Deg
deg
deg
deg
deg
deg
deg
bit
V
V
%/K
Unit
mm
mm
mm
mm
mT
mT
Hz
Hz
Note
0.352 deg
Adjustable resolution only available for incremental
output modes;
Least significant bit, minimum step
Maximum error with respect to the best line fit.
Verified at optimum magnet placement, T
Maximum error with respect to the best line fit.
Verified at optimum magnet placement ,
T
Best line fit = (Err
Over displacement tolerance with 6mm diameter
magnet, T
10bit, no missing codes
RMS equivalent to 1 sigma
Incremental modes only
DC supply voltage 3.3V (VDD3V3)
DC supply voltage 3.3V (VDD3V3)
%
amb
= -40 to +125°C
Note
Recommended magnet: Ø 6mm x 2.5mm for
cylindrical magnets
Required vertical component of the magnetic field
strength on the die’s surface, measured along a
concentric circle with a radius of 1.1mm
Constant magnetic stray field
Including offset gradient
Absolute mode: 600 rpm @ readout of 1024
positions (see table 6)
Incremental mode: no missing pulses at rotational
speeds of up to 30,000 rpm (see table 6)
Max. X-Y offset between defined IC package
center and magnet axis (see
Max. X-Y offset between chip center and magnet
axis.
Placement tolerance of chip within IC package
(see
NdFeB (Neodymium Iron Boron)
SmCo (Samarium Cobalt)
amb
Figure 23
= -40 to +125°C
max
)
– Err
min
) / 2
Figure 21
amb
)
=25 °C.
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