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1 General Description
The AS5035 is a magnetic incremental encoder with 64
quadrature pulses per revolution (8-bit resolution) and
index output.
Two diagnostic outputs are provided to indicate an out-of-
range condition of the magnetic field as well as movement
of the magnet in Z-axis. In addition a specific combination
of output states indicate a loss of power supply.
The AS5035 is available in a small 16pin SSOP package. It
can be operated at either 3.3V or 5V supplies.
Figure 1: Typical arrangement of AS5035 and magnet
1.1 Benefits
- Complete system-on-chip, including analog front end
and digital signal processing
- 2-channel quadrature and index outputs provide an
alternative to optical encoders
- User programmable Zero positioning by OTP allows
easy assembly of magnet
- Diagnostic features for operation safety
- Ideal for applications in harsh environments due to
magnetic sensing principle
- Robust system, tolerant to magnet misalignment, air
gap variations, temperature variations and external
magnetic stray fields
- No calibration required
2 Key Features
- Full turn (360°) contactless angular position encoder
- 2 quadrature A/B outputs with 64 pulses per revolution
(ppr), 256 edges per revolution, 1.4° per step
- Index output (one pulse per revolution)
- Accurate user programmable zero position (0.35°)
- Failure detection mode for magnet placement
monitoring and loss of power supply
- Wide temperature range: - 40°C to + 125°C
- Small lead-free package: SSOP 16 (5.3mm x 6.2mm)
3 Applications
Industrial applications:
- Robotics
- Replacement of optical encoders
- Flow meters
- Man-machine interface
Automotive applications:
- Power seat position sensing
- Power mirror position sensing
4 Pin Configuration
Figure 2: AS5035 Pin configuration SSOP16
AS5035
PROGRAMMABLE 64 PPR INCREMENTAL MAGNETIC ROTARY ENCODER DATA SHEET
AS5035 – 64 PPR INCREMENTAL MAGNETIC ROTARY ENCODER
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AS5035
Sin
Cos
Ang
Mag
MagINCn
MagDECn
Channel A
Channel B
Index
VDD5V
VDDV3V
OTP_CLK
OTP_DO
PROG
CSn
LDO 3.3V
Ha ll A rra y
&
Frontend
Amplifier
OTP
Zero
Position
DSP Incremental
Decoder
Figure 3: AS5 035 Block diagram
4.1 Pin List & Description
Pin #
SSOP16
Name Type AS5035
1 MagInc DO_OD Mag. Field indicator
2 MagDec DO_OD Mag. Field indicator
3 A DO Quadrature channel A
4 B DO Quadrature channel B
5 N.C. test Must be left open
6 Index DO Incremental Index output
7 VSS Supply Supply Ground
8 Prog DI , pd
OTP Programming Input. Internal pull-down resistor
(~74kΩ).
Should be connected to VSS if not used
9 OTP_DO DO_T Data Output for Zero Position programming
10 OTP_CLK DI,ST Clock Input for Zero Position programming; Schmitt-
Trigger input. Should be connected to VSS if not used
11 CSn DI_ST, pu Enable outputs A,B,I (see 5.4). Connect to VSS for
normal operation
12 N.C. test Must be left open
13 N.C. test Must be left open
14 N.C. test Must be left open
15 VDD3V3 Supply 3V regulator output
16 VDD5V Supply 5V positive supply input
Table 1: Pin description
DO_OD : digital output, open drain DO : digital push/pull output
DI : digital input ST : Schmitt-Trigger input
pu : internal pull-up resistor pd : internal pull-down resistor
test : pin is used for factory testing, must be left unconnected
4.2 Unused Pins
Pins # 5, 8, 12, 13 and 14 are for factory testing and must be left unconnected
Pins# 8, 9 and 10 are used for OTP Zero Position Programming only. In normal operation, they can be left open or connected to
VSS (pins 8 and 10 only)
AS5035 – 64 PPR INCREMENTAL MAGNETIC ROTARY ENCODER
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5 Connecting the AS5035
5.1 Power Supply
5.1.1 5. 0V Operation
Connect a 4.5V to 5.5V power supply to pin VDD5V only.
Add a 1µF to 10µF buffer capacitor to pin VDD3V3
5.1.2 3. 3V Operation
Connect a 3.0V to 3.6 V power supply to both pins VDD5V
and VDD3V3. If necessary, add a 100nF ceramic buffer
capacitor to pin VDD3V3.
LDO
I
N
T
E
R
F
A
C
E
2.2...10µF
100n
4.5 - 5.5V
A
Index
B
VDD3V3
VSS
VDD5V
5V Operation
Internal
VDD
CSn
LDO
100n
3.0 - 3.6V
VDD3V3
VSS
VDD5V
3.3V Operation
Internal
VDD
I
N
T
E
R
F
A
C
E
A
Prog
OTP_CLK
OTP_DO
Index
B
CSn
Prog
OTP_CLK
OTP_DO
Figure 4: Connections for 5V / 3.3V supply voltages
5.2 Logic High and Low Level s
VDD5V will be either 3.0 - 3.6V or 4.5 - 5.5V, depending on
configuration.
In either case, the logic levels on output pins A, B and
Index will be
Vout high = VDD5V – 0.5V,
Vout low = VSS+0.4V.
The logic level on the CSn input pin will be
Vin high = VDD5V*0.7,
Vin low = VDD5V*0.3
5.3 Output Current
The available maximum output current on pins A, B and
Index to maintain the Vout high and Vout low levels is
2mA (sink and source) at VDD5V = 3.0V
4mA (sink and source) at VDD5V = 4.5V
5.4 Chip Select Pin CSn
5.4.1 Wit hout Power-up Diagnost ic Feature
For standalone operation without microcontroller, pin CSn
should be connected to VSS permanently. The incremental
outputs will be available, as soon as the internal offset
compensation is finished (within <50ms).
5.4.2 With Power-up Diagnostic Feature
A diagnostic feature is available to detect a temporary loss
of power or initial power-up of the AS5035:
if the CSn pin is high or left open (internal pull up resistor
~50kΩ) during power-up, the incremental outputs will
remain in high state: A = B = Index = High.
This state indicates a power-up or temporary loss of power,
as in normal operation A, B and Index will never be high at
the same time. When Index is high, both A and B are low.
To clear this state end enable the incremental outputs,
CSn must be pulled low. The incremental outputs will
remain enabled if CSn returns to high afterwards.
AS5035 – 64 PPR INCREMENTAL MAGNETIC ROTARY ENCODER
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5.5 MagInc and MagDec Indicators
These two pins are open-drain outputs with a maximum
driving capability of 2mA @ 3.0V and 4mA @ 4.5V.
MagINC, (Magnitude Increase) turns on, when the magnet
is pushed towards the IC, thus when the magnetic field
strength is increasing.
MagDEC, (Magnitude Decrease) turns on, when the
magnet is pulled away from the IC, thus when the magnetic
field strength is decreasing.
If both outputs are low, they indicate that the magnetic
field out of the allowed range:
MagINC MagDEC Description
off off No distance change. Magnetic Input Field OK
off on Distance increase (Magnet pulled away from IC)
on off Distance decrease (Magnet pushed towards IC)
on on
Magnetic Input Field invalid – out of range:
either too large (magnet too close) or too small (missing magnet or magnet too far away)
Table 2: Magnetic field strength diagnostic outputs
off = open-drain output transistor is off. Using a pull-up resistor, the output is high
on = open-drain output transistor is on. Using a pull-up resistor, the output is low
Both outputs MagInc and MagDec may be tied together, using one common pull-up resistor. In this case, the output will be high
only when the magnetic field is in range. It will be low when either the magnet is moving in Z-axis or when the magnetic field is
out of range.
6 Incremental Outputs
6.1 A, B and Index
The phase shift between channel A and B indicates the
direction of the magnet movement. Channel A leads
channel B at a clockwise rotation of the magnet (top view,
magnet placed above or below the device) with 90
electrical degrees. Channel B leads channel A at a
counter-clockwise rotation. The Index pulse has a width of
1LSB = 1.4°
6.2 Hysteresis
To avoid flickering of the incremental outputs at a
stationary mechanical position, a hysteresis of 0.7° is
introduced. When the direction of rotation is reversed, the
incremental outputs will not change state unless the
movement in the opposite direction is larger than the
hysteresis. This leads to the effect that the A,B and Index
pulse positions will be shifted by 0.7° when the rotational
direction is reversed. This shift is cancelled again with the
next reversal of direction so that the A,B and Index pulses
appear always at the same position for a given rotational
direction no matter how often the rotational direction is
reversed (see Figure 5).
.
A
B
Index=
1.40625°
Ind ex
Mechanical
Zero Position
Rotation Direction
Change
CSn
t Incremental outputs valid
Hysteresis =0.7°
Mechanical
Zero Position
power-up
1.40625°
=90e°
5.625°
=360e°
Figure 5: Incremental quadrature outputs
AS5035 – 64 PPR INCREMENTAL MAGNETIC ROTARY ENCODER
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7 Zero Position Programming
Zero Position Programming is an OTP option that simplifies
assembly of a system, as the magnet does not need to be
manually adjusted to the mechanical zero position. Once
the assembly is completed, the mechanical and electrical
zero positions can be matched by software. Any position
within a full turn can be defined as the permanent new
index position.
For Zero Position Programming, the magnet is turned to
the mechanical zero position (e.g. the “off”-position of a
rotary switch) and an automatic zero position programming
is applied.
The zero position is programmed to an accuracy of +/-
0.35°.
USB
Figure 6: Hardware connection of AS5035 to AS50xx Demoboard for Zero Position Programming
AS5035 – 64 PPR INCREMENTAL MAGNETIC ROTARY ENCODER
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7.1 OTP Programming Timing
OTP programming requires access to the factory settings
register of the AS5035. Improper or accidental modification
of the factory settings may render the chip unusable.
Therefore the Zero Position and CCW programming is
recommended only with austriamicrosystems proprietary
hardware and software.
Note: During the programming process, the transitions in
the programming current may cause high voltage spikes
generated by the inductance of the connection cable. To
avoid these spikes and possible damage to the IC, the
connection wires, especially the signals Prog and VSS
must be kept as short as possible. The maximum wire
length between the VPROG switching transistor and pin Prog
(see Figure 6) should not exceed 50mm (2 inches). To
suppress eventual voltage spikes, a 10nF ceramic
capacitor should be connected close to pins Prog and VSS.
This capacitor is only required for programming, it is not
required for normal operation.
The clock timing tclk must be selected at a proper rate to
ensure that the signal Prog is stable at the rising edge of
CLK (see Figure 7). Additionally, the programming supply
voltage should be buffered with a 10µF capacitor mounted
close to the switching transistor. This capacitor aids in
providing peak currents during programming.
The specified programming voltage at pin Prog is 7.3 –
7.5V (see section 12.8). To compensate for the voltage
drop across the VPROG switching transistor, the applied
programming voltage may be set slightly higher (7.5 -
8.0V).
7.1.1 CCW B it Programming
The absolute angular output value, by default, increases
with clockwise rotation of the magnet (top view). Setting
the CCW-bit (see Figure 7) allows for reversing the
indicated direction, e.g. when the magnet is placed
underneath the IC:
CCW = 0 – angular value increases clockwise;
CCW = 1 – angular value increases counterclockwise.
Note: Further information on the required hardware and
software for Zero Position programming of the AS5035 can
be found in the “AS5035” section of the
austriamicrosystems website:
http:www.austriamicrosystems.com
(
Æ
Rotary Encoders
Æ
AS5035)
Figure 7: Programming access – write data (first section of Figure 8)
Figure 8: Complete programming sequence
AS5035 – 64 PPR INCREMENTAL MAGNETIC ROTARY ENCODER
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8 Simulation Modelling
Figure 9: Arrangement of Hall sensor array on chip (principle)
With reference to Figure 9, a diametrically magnetized
permanent magnet is placed above or below the surface
of the AS5035. The chip uses an array of Hall sensors to
sample the vertical vector of a magnetic field distributed
across the device package surface. The area of magnetic
sensitivity is a circular locus of 1.1mm radius with
respect to the center of the die. The Hall sensors in the
area of magnetic sensitivity are grouped and configured
such that orthogonally related components of the
magnetic fields are sampled differentially.
The differential signal Y1-Y2 will give a sine vector of
the magnetic field. The differential signal X1-X2 will give
an orthogonally related cosine vector of the magnetic
field.
The angular displacement (Θ) of the magnetic source
with reference to the Hall sensor array may then be
modelled by:
()
()
°±
−
−
=Θ 5.0
21 21
arctan XX YY
The ±0.5° angular error assumes a magnet optimally
aligned over the center of the die and is a result of gain
mismatch errors of the AS5035. Placement tolerances of
the die within the package are ±0.235mm in X and Y
direction, using a reference point of the edge of pin #1
(Figure 11)
In order to neglect the influence of external disturbing
magnetic fields, a robust differential sampling and
ratiometric calculation algorithm has been implemented.
The differential sampling of the sine and cosine vectors
removes any common mode error due to DC components
introduced by the magnetic source itself or external
disturbing magnetic fields. A ratiometric division of the
sine and cosine vectors removes the need for an
accurate absolute magnitude of the magnetic field and
thus accurate Z-axis alignment of the magnetic source.
The recommended differential input range of the
magnetic field strength (B(X1-X2),B(Y1-Y2)) is ±75mT at the
surface of the die. In addition to this range, an additional
offset of ±5mT, caused by unwanted external stray fields
is allowed.
The chip will continue to operate, but with degraded
output linearity, if the signal field strength is outside the
recommended range. Too strong magnetic fields will
introduce errors due to saturation effects in the internal
preamplifiers. Too weak magnetic fields will introduce
errors due to noise becoming more dominant.
9 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.
Magnet axis
Vertical field
component
(45…75mT)
0
360
360
Bv
Vertical field
component
R1 concentric circle;
radius 1.1mm
R1
Magnet axis
typ. 6mm diameter
SN
Figure 10: Typical magnet and magnetic field distribution
A
S5040 die
1
Radius of circular Hall sensor
array: 1.1mm radius
Center of die
2.433 mm
±0.235mm
3.9 mm
±
0.235mm
X1
Y1
X2
Y2
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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 10).
9.1 Physical Placement of the Magnet
The best linearity can be achieved by placing the center
of the magnet exactly over the defined center of the IC
package as shown in Figure 11:
1
Defined
center
2.433 mm
2.433 mm
3.9 mm 3.9 mm
A
rea of recommended maximum
magnet misalignment
Rd
Figure 11: Defined IC center and magnet displacement radius
Magnet Pl acement:
The magnet’s center axis should be aligned within a
displacement radius Rd of 0.25mm from the defined
center of the IC with reference to the edge of pin #1 (see
Figure 11). This radius includes the placement tolerance
of the chip within the SSOP-16 package (+/- 0.235mm).
The displacement radius Rd is 0.485mm with reference to
the center of the chip
The vertical distance should be chosen such that the
magnetic field on the die surface is within the specified
limits (see Figure 10). The typical distance “z” between
the magnet and the package surface is 0.5mm to 1.8mm
with the recommended magnet (6mm x 3mm). Larger
gaps are possible, as long as the required magnetic field
strength stays within the defined limits.
A magnetic field outside the specified range may still
produce usable results, but the out-of-range condition
will be indicated by MagINCn (pin 1) and MagDECn (pin
2), see 5.5.
1.282mm ± 0.15mm
0.576mm ± 0.1mm
z
SN
Package surfaceDie surface
Figure 12: Vertical placement of the magnet
10 Angular Output Tolerances
10.1 Accur acy
Accuracy is defined as the error between measured
angle and actual angle. It is influenced by several
factors:
the non-linearity of the analog-digital converters,
internal gain and mismatch errors,
non-linearity due to misalignment of the magnet
As a sum of all these errors, the accuracy with centered
magnet = (Errmax – Errmin)/2 is specified as better than
±0.5 degrees @ 25°C (see Figure 14).
Misalignment of the magnet further reduces the
accuracy. Figure 14 shows an example of a 3D-graph
displaying non-linearity over XY-misalignment. The
center of the square XY-area corresponds to a centered
magnet (see dot in the center of the graph). The X- and
Y- axis extends to a misalignment of ±1mm in both
directions. The total misalignment area of the graph
covers a square of 2x2 mm (79x79mil) with a step size of
100µm.
Figure 13: Ex ample of linearity er ror over XY misalignm ent
-1000
-700
-400
-100
200
500
800
-1000
-800
-600
-400
-200
0
200
400
600
800
1000
0
1
2
3
4
5
6
°
x
y
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For each misalignment step, the measurement as shown
in Figure 14 is repeated and the accuracy
(Errmax – Errmin)/2 (e.g. 0.25° in Figure 14) is entered as
the Z-axis in the 3D-graph.
The maximum non-linearity error on this example is
better than ±1 degree (inner circle) over a misalignment
radius of ~0.7mm. For volume production, the placement
tolerance of the IC within the package (±0.235mm) must
also be taken into account.
The total nonlinearity error over process tolerances,
temperature and a misalignment circle radius of 0.25mm
is specified better than ±1.4 degrees.
The magnet used for these measurement was a
cylindrical NdFeB (Bomatec® BMN-35H) magnet with
6mm diameter and 2.5mm in height.
Figure 14: Ex ample of linearity er ror over 360°
10.2 Transition Noi se
Transition noise is defined as the jitter in the transition
between two steps.
Due to the nature of the measurement principle (Hall
sensors + Preamplifier + ADC), there is always a certain
degree of noise involved.
This transition noise voltage results in an angular
transition noise at the outputs. It is specified as 0.06
degrees rms (1 sigma)*1.
This is the repeatability of an indicated angle at a given
mechanical position.
The transition noise influences the period, width and
phase shift of the output signals A, B and Index:
Parameter Tolerance (1σ)
(rms)
Tolerance (3σ)
(peak)
Index Pulse
width 1.406° +/-0.06° 1.406° +/-0.18°
A,B Pulse width 2.813° +/-0.06° 2.813° +/-0.18°
Period 5.625° +/-0.06° 5.625° +/-0.18°
A-B Phase shift 90e° +/-1.9e° 90e° +/-5.7e°
Table 3: Incre mental signal tolerance s with transition noise
e° = electrical degrees (see Figure 5)
*1: statistically, 1 sigma represents 68.27 % of readings,
3 sigma represents 99.73% of readings.
The algorithm used to generate the incremental outputs
guarantees no missing or additional pulses even at high
speeds (up to 30,000 rpm and higher)
10.3 High Speed Operation
10.3.1 Sampling Rate
The AS5035 samples the angular value at a rate of 10k
samples per second. Consequently, the incremental
outputs are updated each 100µs.
At a stationary position of the magnet, this sampling rate
creates no additional error.
Incremental encoders are usually required to produce no
missing pulses up to several thousand rpm’s.
Therefore, the AS5035 has a built-in interpolator, which
ensures that there are no missing pulses at the
incremental outputs for rotational speeds of up to
10,000rpm.
linearity error with centered magnet [degrees]
-0.5
-0.4
-0.3
-0.2
-0.1
0
0.1
0.2
0.3
0.4
0.5
0°
90°
180°
270° 360°
transition noise
Err
max
Err
min
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10.4 Output Delays
Due to the sampling rate of 10kHz, there will be a delay
of up to 100µs between the time that the sample is taken
until it is converted and available as angular data.
A rotating magnet will therefore cause an angular error
caused by the output delay.
This error increases linearly with speed:
4
6−
∗= Erpmesampling
At low speeds this error is small (e.g. <= 0.06° at 100
rpm).
At speeds over 586 rpm, the error approaches 1LSB
(0.35°). The maximum error caused by the sampling rate
of the ADCs is 0/+100µs. It has a peak of 1LSB = 0.35°
at 586 rpm.
At higher speeds this error is reduced again due to
interpolation and the output delay remains at 200µs
as the DSP requires two sampling periods (2x100µs) to
synthesize and redistribute any missing pulses.
10.5 Temper ature
10.5.1 Magnetic Temperatur e Coefficient
One of the major benefits of the AS5035 compared to
linear Hall sensors is that it is much less sensitive to
temperature. While linear Hall sensors require a
compensation of the magnet’s temperature coefficients,
the AS5035 automatically compensates for the varying
magnetic field strength over temperature. The magnet’s
temperature drift does not need to be considered, as the
AS5035 operates with magnetic field strengths from
±45…±75mT.
Example:
A NdFeB magnet has a field strength of
75mT @ –40°C and a temperature coefficient of
-0.12% per Kelvin. The temperature change is from
–40° to +125° = 165K.
The magnetic field change is: 165 x -0.12% = -19.8%,
which corresponds to
75mT at –40°C and 60mT at 125°C .
The AS5035 can compensate for this temperature related
field strength change automatically, no user adjustment
is required.
10.5.2 Accuracy over Temperatur e
The influence of temperature in the absolute accuracy is
very low. While the accuracy is ≤ ±0.5° at room
temperature, it may increase to ≤±0.9° due to increasing
noise at high temperatures.
10.5.3 Timing Tolerance over Temperature
The internal RC oscillator is factory trimmed to ±5%.
Over temperature, this tolerance may increase to ±10%.
Generally, the timing tolerance has no influence in the
accuracy or resolution of the system, as it is used mainly
for internal clock generation.
11 Failure Diagnostics
The AS5035 also offers several diagnostic and failure
detection features:
11.1 Magnetic Field Strength Di agnosis
Pins #1 (MagINCn) and #2 (MagDECn) are open-drain
outputs and will both be turned on (= low with external
pull-up resistor) when the magnetic field is out of range.
If only one of the outputs is low, the magnet is either
moving towards the chip (MagINCn) or away from the
chip (MagDECn).
11.2 Power Supply Failure Detection
11.2.1 MagINCn and MagDECn Pins:
These are open drain outputs and require external pull-
up resistors. In normal operation, these pins are high
ohmic and the outputs are high (see Table 2). In a failure
case, either when the magnetic field is out of range or
the power supply is missing, these outputs will become
low. To ensure adequate low levels in case of a broken
power supply to the AS5035, the pull-up resistors
(>10kΩ) must be connected to the positive supply at pin
16 (VDD5V).
11.2.2 Incremental Outpu ts:
In normal operation, pins A(#3), B(#4) and Index (#6) will
never be high at the same time, as Index is only high
when A=B=low. However, after a power-on-reset, if VDD
is powered up or restarts after a power supply
interruption, all three outputs will remain in high state
until pin CSn is pulled low (see 5.4.2 ). If CSn is already
tied to VSS during power-up, the incremental outputs will
all be high until the internal offset compensation is
finished (within tPwrUp).
Another way to detect a power supply loss is by
connecting pull-up resistors to the A,B and Index pins at
the receiving side (µC, control unit, etc..). If the negative
power line to the sensor is interrupted, all three outputs
will be pulled high by the external pull-up resistors. This
unique state again indicates a failure as it does not occur
in normal operation.
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12 Electrical Characteristics
12.1 Absol ute Maximum Ratings (non operating)
Stresses beyond those listed under “Absolute Maximum Ratings“ may cause permanent damage to the device. These are stress ratings
only. Functional operation of the device at these or any other conditions beyond those indicated under “Operating Conditions” is not
implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Parameter Symbol Min Max Unit
Note
DC supply voltage at pin VDD5V VDD5V -0.3 7 V
DC supply voltage at pin VDD3V3 VDD3V3 5 V
Input pin voltage Vin -0.3 VDD5V +0.3 V
Input current (latchup immunity) Iscr -100 100 mA Norm: JEDEC 78
Electrostatic discharge ESD ± 2 kV Norm: MIL 883 E method 3015
Storage temperature Tstrg -55 125 °C Min – 67°F ; Max +257°F
Body temperature (Lead-free package) TBody 260 °C
t=20 to 40s, Norm: IPC/JEDEC J-Std-020C
Lead finish 100% Sn “matte tin”
Humidity non-condensing rH 5 85 %
12.2 Operating Conditi ons
Parameter Symbol Min Typ
Max Unit Note
Ambient temperature Tamb -40 125
°C -40°F…+257°F
Supply current Isupp 16 25 mA
Supply voltage at pin VDD5V
Voltage regulator output voltage at pin VDD3V3
VDD5V
VDD3V3
4.5
3.0
5.0
3.3
5.5
3.6
V
V 5V Operation
Supply voltage at pin VDD5V
Supply voltage at pin VDD3V3
VDD5V
VDD3V3
3.0
3.0
3.3
3.3
3.6
3.6
V
V
3.3V Operation
(pin VDD5V and VDD3V3 connected)
12.3 DC Charact eristics for Digital Inputs and Outputs
12.3.1 CMOS Schmitt-Trigger Inputs: OTP_CLK, CSn (CSn = int ernal Pull-up)
Parameter Symbol Min Max Unit Note
High level input voltage VIH 0.7 * VDD5V V Normal operation
Low level input voltage VIL 0.3 * VDD5V V
Schmitt-Trigger hysteresis VIon- VIoff 1 V
-1 1 CLK only
Input leakage current
Pull-up low level input current
ILEAK
IiL -30 -100
µA
µA CSn only, VDD5V: 5.0V
12.3.2 CMOS Output Open Drain: MagINCn, MagDECn
Parameter Symbol Min Max Unit Note
Low level output voltage VOL VSS+0.4 V
Output current IO 4
2 mA VDD5V: 4.5V
VDD5V: 3V
Open drain leakage current IOZ 1 µA
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12.3.3 CMOS Outputs: A, B, Index, OTP_DO
Parameter Symbol Min Max Unit Note
High level output voltage VOH VDD5V-0.5
V
Low level output voltage VOL VSS+0.4 V
Output current IO 4
2
mA
mA
VDD5V: 4.5V
VDD5V: 3V
12.4 Magnetic Input Specification
Two-pole cylindrical diametrically magnetised source:
Parameter Symbol Min Typ Max
Unit
Note
Diameter dmag 4 6 mm
Thickness tmag 2.5 mm
Recommended magnet Ø 6mm x 2.5mm for cylindrical
magnets
Magnetic input field
amplitude Bpk 45
75 mT
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 mT Constant magnetic stray field
Field non-linearity 5 % Including offset gradient
Input frequency
(rotational speed of
magnet)
fmag_inc
500 Hz
Incremental mode: no missing pulses at rotational speeds
of up to 30,000 rpm
Magnetic field temperature
drift Btc – 0.035
%/K Samarium Cobalt ReComa28
Displacement radius Disp
0.25 mm
Max. offset between defined device center and magnet
axis
(see Figure 11)
12.5 Electrical System Specificatio ns
Parameter Symbol
Min Typ Max Unit
Note
LSB 1.406
deg Degrees / step
Resolution RES 8
64
bit
ppr Channel A and B
Index bit width tw,Index 1.406
deg = 1 LSB (see Table 3)
Integral non-linearity (optimum) INLopt ± 0.5 deg
Maximum error with respect to the best line fit.
Centered magnet placement without calibration,
Tamb =25 °C.
Integral non-linearity (optimum) INLtemp ± 0.9 deg
Maximum error with respect to the best line fit.
Centered magnet placement without calibration,
Tamb = -40 to +125°C
Integral non-linearity INL ± 1.4 deg
Best line fit = (Errmax – Errmin) / 2
Over displacement tolerance with 6mm diameter
magnet, without calibration Tamb = -40 to +125°C
Differential non-linearity DNL ± 0.176
deg no missing codes
Transition noise TN 0.06 Deg
rms rms = 1 sigma (see 10.2)
Hysteresis Hyst 0.704
deg
Power-on reset thresholds
On voltage; 300mV typ. hysteresis
Off voltage; 300mV typ. hysteresis
Von
Voff
1,37
1.08
2.2
1.9
2.9
2.6
V
V
DC supply voltage 3.3V (VDD3V3)
DC supply voltage 3.3V (VDD3V3)
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12.6 Timing Characteristi cs
Parameter Symbol
Min Typ Max Unit
Note
Power-up time tPwrUp 50 ms until internal offset compensation is finished
500 ns
if CSn is high during power up:
= Time after tPwrUp from first falling edge of CSn to
valid incremental outputs.
Incremental outputs valid after power-up t Incremental
outputs valid
If CSn is low during power up:
Incremental outputs are valid as soon as tPwrUp is
expired
System propagation delay 192 µs Calculation over two samples
Sampling rate fS 9.5 10 10.5 kHz Internal sampling rate
12.7 Incremental Output Signal Tolerances
See Table 3 on page 9
12.8 Programmi ng Conditions
(operating conditions: Tamb = -40 to +125°C, VDD5V = 3.0-3.6V (3V operation) VDD5V = 4.5-5.5V (5V operation) unless otherwise noted)
Parameter Symbol Min Typ Max Unit Note
Programming enable time t Prog enable 2 µs
Time between rising edge at Prog
pin and rising edge of CSn
Write data start t Data in 2 µs
Write data valid t Data in valid 250 ns
Write data at the rising edge of
CLKPROG
Load programming data t Load PROG 3 µs
Rise time of VPROG before CLK PROG t
PrgR 0 µs
Hold time of VPROG after CLK PROG t
PrgH 0 5 µs
Write data – programming CLK PROG CLK PROG 250 kHz
CLK pulse width t PROG 1.8 2 2.2 µs During programming; 16 clock cycles
Hold time of Vprog after
programming
t PROG
finished 2 µs
Programmed data is available after
next power-on
Programming voltage V PROG 7.3 7.4 7.5 V Must be switched off after zapping
Programming voltage off level V ProgOff 0 1 V Line must be discharged to this level
Programming current I PROG 130 mA During programming
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13 Package Drawings and Markings
16-Lead Shrink Small Outline Package SSOP-16
Dimensions
mm inch
Symbol Min Typ Max Min Typ Max
A
1.73 1.86 1.99 .068 .073
.078
A
1 0.05 0.13 0.21 .002 .005
.008
A
2 1.68 1.73 1.78 .066 .068
.070
b 0.25 0.315 0.38 .010 .012
.015
c 0.09 - 0.20 .004 -
.008
D 6.07 6.20 6.33 .239 .244
.249
E 7.65 7.8 7.9 .301 .307
.311
E1 5.2 5.3 5.38 .205 .209
.212
e 0.65 .0256
K 0° - 8° 0° -
8°
L 0.63 0.75 0.95 .025 .030
.037
13.1 Packing O ptions
Delivery: Tape and Reel (1 reel = 2000 devices)
Tubes (1 box = 100 tubes á 77 devices)
Order # AS5035 for delivery in tubes
Order # AS5035TR for delivery in tape and reel
AYWWIZZ
AS5035
Marking: AYWWIZZ
A: Pb-free Identifier
Y: Last Digit of Manufacturing Year
WW: Manufacturing Week
I: Plant Identifier
ZZ: Traceability Code
JEDEC Package Outline Standard: MO - 150 AC
Thermal Resistance Rth(j-a):
typ. 151 K/W in still air, soldered on PCB
IC's marked with a white dot or the letters "ES" denote
Engineering Samples
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14 Recommended PCB Footprint:
Recommended Footprint Data
mm
inch
A
9.02
0.355
B
6.16
0.242
C
0.46
0.018
D
0.65
0.025
E
5.01
0.197
AS5035 – 64 PPR INCREMENTAL MAGNETIC ROTARY ENCODER
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15 Contact
15.1 Headquarters
austriamicrosystems AG
A 8141 Schloss Premstätten, Austria
Phone: +43 3136 500 0
Fax: +43 3136 525 01
industry.medical@austriamicrosystems.com
www.austriamicrosystems.com
15.2 Sales Offices
austriamicrosystems Germany GmbH
Tegernseer Landstrasse 85
D-81539 München, Germany
Phone: +49 89 69 36 43 0
Fax: +49 89 69 36 43 66
austriamicrosystems Italy S.r.l.
Via A. Volta, 18
I-20094 Corsico (MI), Italy
Phone: +39 02 4586 4364
Fax: +39 02 4585 773
austriamicrosystems France S.A.R.L.
124, Avenue de Paris
F-94300 Vincennes, France
Phone: +33 1 43 74 00 90
Fax: +33 1 43 74 20 98
austriamicrosystems Switzerland AG
Rietstrasse 4
CH 8640 Rapperswil, Switzerland
Phone: +41 55 220 9008
Fax: +41 55 220 9001
austriamicrosystems UK, Ltd.
88, Barkham Ride,
Finchampstead, Wokingham
Berkshire RG40 4ET, United K ingdom
Phone: +44 118 973 1797
Fax: +44 118 973 5117
austriamicrosystems AG
Klaavuntie 9 G 55
FI 00910 Helsinki, Finland
Phone: +358 9 72688 170
Fax: +358 9 72688 171
austriamicrosystems AG
Bivägen 3B
S 19163 Sollentuna, Sweden
Phone: +46 8 6231 710
austriamicrosystems USA, Inc.
8601 Six Forks Road
Suite 400
Raleigh, NC 27615, USA
Phone: +1 919 676 5292
Fax: +1 509 696 2713
austriamicrosystems USA, Inc.
4030 Moorpark Ave
Suite 116
San Jose, CA 95117, USA
Phone: +1 408 345 1790
Fax: +1 509 696 2713
austriamicrosystems AG
Suite 811, Tsimshatsui Centre
East Wing, 66 Mody Road
Tsim Sha Tsui East, Kowloon, Hong Kon g
Phone: +852 2268 6899
Fax: +852 2268 6799
austriamicrosystems AG
AIOS Gotanda Annex 5th Fl., 1-7-11,
Higashi-Gotanda, Shinagawa-ku
Tokyo 141-0022, Japan
Phone: +81 3 5792 4975
Fax: +81 3 5792 4976
austriamicrosystems AG
#805, Dong Kyung Bldg.,
824-19, Yeok Sam Dong,
Kang Nam Gu, Seoul
Korea 135-080
Phone: +82 2 557 8776
Fax: +82 2 569 9823
austriamicrosystems AG
Singapore Representative Office
83 Clemenceau Avenue, #02-01 UE Square
239920, Singapore
Phone: +65 68 30 83 05
Fax: +65 62 34 31 20
AS5035 – 64 PPR INCREMENTAL MAGNETIC ROTARY ENCODER
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Copyrights
Copyright © 1997-2007, austriamicrosystems AG, Schloss Premstaetten, 8141 Unterpremstaetten, Austria-Europe.
Trademarks Registered ®. All rights reserved. The material herein may not be reproduced, adapted, merged, translated, stored,
or used without the prior written consent of the copyright owner.
All products and companies mentioned are trademarks or registered trademarks of their respective companies.
This product is protected by U.S. Patent No. 7,095,228.
Disclaim er
Devices sold by austriamicrosystems AG are covered by the warranty and patent indemnification provisions appearing in its
Term of Sale. austriamicrosystems AG makes no warranty, express, statutory, implied, or by description regarding the
information set forth herein or regarding the freedom of the described devices from patent infringement. austriamicrosystems
AG reserves the right to change specifications and prices at any time and without notice. Therefore, prior to designing this
product into a system, it is necessary to check with austriamicrosystems AG for current information. This product is intended for
use in normal commercial applications. Applications requiring extended temperature range, unusual environmental
requirements, or high reliability applications, such as military, medical life-support or lifesustaining equipment are specifically
not recommended without additional processing by austriamicrosystems AG for each application.
The information furnished here by austriamicrosystems AG is believed to be correct and accurate. However,
austriamicrosystems AG shall not be liable to recipient or any third party for any damages, including but not limited to personal
injury, property damage, loss of profits, loss of use, interruption of business or indirect, special, incidental or consequential
damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical data herein. No
obligation or liability to recipient or any third party shall arise or flow out of austriamicrosystems AG rendering of technical or
other services.
