AMS AS5035 Datasheet
Annonce
Annonce
General Description
Figure 1:
Added Value of Using AS5035
Benefits
•
Complete system-on-chip, including analog front end and digital signal processing, no calibration required
AS5035
Programmable 64 PPR Incremental
Magnetic Rotary Position Sensor
The AS5035 is a magnetic incremental position sensor 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.
and
Content Guide appear at end of
datasheet.
Key Benefits & Features
The benefits and features of AS5035, Programmable 64 PPR
Incremental Magnetic Rotary Position Sensor are listed below:
•
2-channel quadrature and index outputs provide an alternative to optical position sensors
•
User programmable Zero positioning by OTP allows easy assembly of magnet
•
Diagnostic features for operation safety
•
Ideal for applications in harsh environments
Features
•
Robust system, tolerant to magnet misalignment, air gap variations, temperature variations and external magnetic stray fields
•
Small lead(Pb)-free package: SSOP 16
(5.3mm x 6.2mm)
•
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
•
Magnetic sensing principle
•
Full turn (360°) contactless angular position sensor
•
Wide temperature range: -40°C to 125°C
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AS5035 −
General Description
Applications
The AS5035 is suitable for:
Industrial applications:
•
Robotics
•
Replacement of optical position sensors
•
Flow meters
•
Man-machine interface
Automotive application:
•
Power seat position sensing
•
Power mirror position sensing
Figure 2:
Typical Arrangement of AS5035 and Magnet ams Datasheet (discontinued)
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AS5035 −
General Description
Figure 3:
AS5035 Block Diagram
Block Diagram
The functional blocks of this device are shown below:
VDD5V
VDDV3V
LDO 3.3V
Hall Array
&
Frontend
Amplifier
Sin
Cos
AS5035
DSP
Ang
Mag
OTP
Zero
Position
Incremental
Decoder
MagINCn
MagDECn
CSn
Channel A
Channel B
Index
OTP_CLK
OTP_DO
PROG
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Pin Assignment
Figure 4:
AS5035 Pin Configuration SSOP16
AS5035 −
Pin Assignment
Figure 5:
Pin Description
Pin #
SSOP16
Pin Name Type
1
2
MagInc
MagDec
DO_OD
DO_OD
3 A DO
Pin Description
Mag. Field Indicator
Mag. Field Indicator
Description
Test Must be left open
9
10
5 N.C.
6 Index
7 VSS
8 Prog
OTP_DO
OTP_CLK
OTP Programming Input.
DI,
Ω
).
Should be connected to VSS if not used
DO_T Data Output for Zero Position Programming
DI, ST
Clock Input for Zero Position Programming; Schmitt-Trigger input. Should be connected to VSS if not used
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AS5035 −
Pin Assignment
Pin #
SSOP16
Pin Name
11 CSn
12
13
14
15
16
N.C.
N.C.
N.C.
VDD3V3
VDD5V
Type
Test
Test
Test
Supply
Supply
Description
Connect to VSS for normal operation
Must be left open
Must be left open
Must be left open
3V Regulator Output
5V Positive Supply Input
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
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)
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Electrical Characteristics
Electrical Characteristics
Absolute Maximum Ratings
Stresses beyond those listed in Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in
is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Figure 6:
Absolute Maximum Ratings
Symbol
VDD5V
VDD3V3
V in
I scr
ESD
T strg
Parameter
DC supply voltage at pin
VDD5V
DC supply voltage at pin
VDD3V3
Input pin voltage
Input current
(latchup immunity)
Electrostatic discharge
Storage temperature
T
Body
RH
NC
MSL
Body temperature
(Lead-free package)
Relative humidity non-condensing
Moisture sensitivity level
Min
-0.3 7 V
-0.3
Max
5
VDD5V +0.3
Units
V
V
Note
-100 100 mA
± 2
-55 125 kV
°C
260 °C
MIL 883 E method 3015
Min: – 67°F; Max: 257°F t=20s to 40s,
IPC/JEDEC J-Std-020C
Lead finish 100% Sn “matte tin”
5 85 %
3
Represents a maximum floor life time of 168h
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AS5035 −
Electrical Characteristics
Figure 7:
Operating Conditions
Symbol
T amb
I supp
VDD5V
VDD3V3
VDD5V
VDD3V3
Parameter
Ambient temperature
Supply current
Supply voltage at pin
VDD5V
Voltage regulator output voltage at pin VDD3V3
Supply voltage at pin
VDD5V
Supply voltage at pin
VDD3V3
Min Typ Max Units
-40
16
125
25
°C mA
Note
-40°F to 257°F
4.5
3.0
3.0
3.0
5.0
3.3
3.3
3.3
5.5
3.6
3.6
3.6
V
V
V
V
5V operation
3.3V operation
(pin VDD5V and VDD3V3 connected)
DC Characteristics for Digital Inputs and
Outputs
Figure 8:
CMOS Schmitt-Trigger Inputs: OTP_CLK, CSn (CSn = Internal Pull-Up)
Symbol Parameter
V
IH
V
IL
I iL
High level input voltage
Low level input voltage
V
Ion
- V
Ioff
Schmitt-Trigger hysteresis
I
LEAK
Input leakage current
Pull-up low level input current
Min
0.7 * VDD5V
1
-1
Max
0.3 * VDD5V
1
Units
V
V
V
μA
Note
Normal operation
CLK only
-30 -100 μA CSn only, VDD5V: 5.0V
Figure 9:
CMOS Output Open Drain: MagINCn, MagDECn
Symbol
V
OL
Parameter
Low level output voltage
I
O
Output current
I
OZ
Open drain leakage current
Min Max
VSS+0.4
4
2
1
Units
V mA
μA
Note
VDD5V: 4.5V
VDD5V: 3V
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AS5035 −
Electrical Characteristics
Figure 10:
CMOS Outputs: A, B, Index, OTP_DO
Symbol
V
OH
V
OL
Parameter
High level output voltage
Low level output voltage
I
O
Output current
Min
VDD5V-0.5
Max
VSS+0.4
4
2
Units
V
V mA mA
Note
VDD5V: 4.5V
VDD5V: 3V
Magnetic Input Specification
Two-pole cylindrical diametrically magnetized source.
Figure 11:
Magnetic Input Specification
Symbol
d mag
Parameter
Diameter t mag
Thickness
Bpk
Magnetic input field amplitude
B f mag_inc
B off tc
Magnetic offset
Field non-linearity
Input frequency
(rotational speed of magnet)
Magnetic field temperature drift
Disp Displacement radius
Min Typ Max Units
4 6 mm
2.5
45 75
± 10
5
500 mm mT mT
%
Hz
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
Incremental mode: no missing pulses at rotational speeds of up to 30000 rpm
– 0.035
0.25
%/K Samarium Cobalt ReComa28
mm
Max. offset between defined device center and magnet axis
(see
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AS5035 −
Electrical Characteristics
Electrical System Specifications
Figure 12:
Electrical System Specification
Symbol
LSB
RES
t w,Index
INL opt
INL temp
INL
DNL
TN
Hyst
V on
V off
Parameter
Resolution
Index bit width
Integral non-linearity
(optimum)
Integral non-linearity
(optimum)
Integral non-linearity
Differential non-linearity
Transition noise
Hysteresis
Power-on reset thresholds
ON voltage; 300mV typ. hysteresis
OFF voltage; 300mV typ. hysteresis
Min Typ Max Units
1.406
deg
Note
Degrees / step
1.406
8
64 bit ppr deg
Channel A and B
0.704
± 0.5
± 0.9
± 1.4
± 0.176
0.06
deg deg deg deg
Deg rms deg
= 1 LSB (see
Maximum error with respect to the best line fit. Centered magnet placement without calibration, T amb
=25 °C
Maximum error with respect to the best line fit. Centered magnet placement without calibration,
T amb
= -40°C to 125°C
Best line fit =
(Err max
– Err min
) / 2
Over displacement tolerance with 6mm diameter magnet, without calibration
T amb
= -40°C to 125°C
No missing codes
rms = 1 sigma
)
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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AS5035 −
Electrical Characteristics
Timing Characteristics
Figure 13:
Timing Characteristics
Symbol
t
PwrUp
Parameter
Power-up time t
Incremental outputs valid
Incremental outputs valid after power-up f
S
System propagation delay
Sampling rate
Min Typ Max Units
50
500 ms ns
Note
Until internal offset compensation is finished
If CSn is high during power up:
= Time after t
PwrUp
from first falling edge of CSn to valid incremental outputs.
If CSn is low during power up:
Incremental outputs are valid as soon as t
PwrUp
is expired
192 μs Calculation over two samples
9.5 10 10.5 kHz Internal sampling rate
Incremental Output Signal Tolerances
See
.
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Electrical Characteristics
Programming Conditions
Operating conditions: T amb
= -40°C to 125°C,
VDD5V = 3.0-3.6V (3V operation)
VDD5V = 4.5-5.5V (5V operation) unless otherwise noted.
Figure 14:
Programming Conditions
Symbol Parameter
t
Prog enable
Programming enable time
t
Data in
Write data start t
Data in valid
Write data valid
t
Load
PROG
Load programming data
t
t
PrgR
PrgH
CLK
PROG
Rise time of V
PROG before CLK
PROG
Hold time of V
PROG
after
CLK
PROG
Write data – programming CLK
PROG
t
PROG
CLK pulse width t
PROG finished
Hold time of V
PROG
after programming
V
PROG
Programming voltage
V
ProgOFF
Programming voltage
OFF level
I
PROG
Programming current
Min Typ Max Units
2
2
250
μs
μs ns
Note
Time between rising edge at
Prog pin and rising edge of
CSn
Write data at the rising edge of
CLK
PROG
3 μs
0
0
1.8
2
7.3
0
2
5
250
2.2
7.4 7.5
1
130
μs
μs kHz
μs
μs
V
V mA
During programming;
16 clock cycles
Programmed data is available after next Power-ON
Must be switched OFF after zapping
Line must be discharged to this level
During programming
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Connecting the AS5035
AS5035 −
Connecting the AS5035
Power Supply
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.
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.
Figure 15:
Connections for 5V/3.3V Supply Voltages
5V Operation
100n
VDD5V
VDD3V3
LDO
2.2...10µF
Internal
VDD
4.5 - 5.5V
I
N
R
F
T
E
A
C
E
VSS
A
B
Index
CSn
Prog
OTP_CLK
OTP_DO
3.3V Operation
VDD3V3
VDD5V
LDO
Internal
VDD
3.0 - 3.6V
I
N
R
F
T
E
A
C
E
VSS
100n
A
B
Index
CSn
Prog
OTP_CLK
OTP_DO
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AS5035 −
Connecting the AS5035
Logic High and Low Levels
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
V out high = VDD5V – 0.5V,
V out
low = VSS+0.4V.
The logic level on the CSn input pin will be
V in
high = VDD5V*0.7,
V in
low = VDD5V*0.3
Output Current
The available maximum output current on pins A, B and Index to maintain the V out high and V out
low levels is
2mA (sink and source) at VDD5V = 3.0V
4mA (sink and source) at VDD5V = 4.5V
Chip Select Pin CSn
Without Power-Up Diagnostic 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).
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.
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AS5035 −
Connecting the AS5035
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
, (
Mag
nitude
Inc
rease) turns ON, when the magnet is pushed towards the IC, thus when the magnetic field strength is increasing.
MagDEC
, (
Mag
nitude
Dec
rease) 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:
Figure 16:
Magnetic Field Strength Diagnostic Outputs
MagINC
OFF
OFF
ON
ON
MagDEC
OFF
ON
OFF
ON
Description
No distance change. Magnetic Input Field OK
Distance increase (Magnet pulled away from IC)
Distance decrease (Magnet pushed towards IC)
Magnetic Input Field invalid – out of range: either too large (magnet too close) or too small (missing magnet or magnet too far away)
Note(s):
1. OFF = open-drain output transistor is OFF. Using a pull-up resistor, the output is high.
2. 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.
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AS5035 −
Incremental Outputs
Incremental Outputs
Figure 17:
Incremental Quadrature Outputs
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°
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
).
A
B
Index
CSn power-up
1.40625°
=90e°
5.625°
=360e° t
Incremental outputs valid
Mechanical
Zero Position
Rotation Direction
Change
Mechanical
Zero Position
Hysteresis =0.7°
Index=
1.40625°
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AS5035 −
Zero Position Programming
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°.
Figure 18:
Hardware Connection of AS5035 to AS50xx Demoboard for Zero Position Programming
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AS5035 −
Zero Position Programming
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
ams
proprietary hardware and software.
Note(s):
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
) 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 t clk
must be selected at a proper rate to ensure that the signal Prog is stable at the rising edge of CLK (see
Figure 19 ). 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
). To compensate for the voltage drop across the VPROG switching transistor, the applied programming voltage may be set slightly higher (7.5 -8.0V).
CCW Bit Programming
The absolute angular output value, by default, increases with clockwise rotation of the magnet (top view). Setting the
CCW-bit (see
Figure 19 ) 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(s):
Further information on the required hardware and software for Zero Position programming of the AS5035 can be found in the “AS5035” section of the
ams
website: www.ams.com/AS5035
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Figure 19:
Programming Access – Write Data
AS5035 −
Zero Position Programming
Figure 20:
Complete Programming Sequence
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AS5035 −
Simulation Modelling
Simulation Modelling
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Figure 21:
Arrangement of Hall Sensor Array on Chip (Principle)
2.433 mm r
0.235mm
1
3.9 mm r 0.235mm
X1
Y1
X2
Y2
AS5040 die Center of die
Radius of circular Hall sensor array: 1.1mm radius
With reference to
, 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
= arc tan
(
( )
)
°
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 (
).
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AS5035 −
Simulation Modelling
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.
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AS5035 −
Choosing the Proper Magnet
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.
Figure 22:
Typical Magnet and Magnetic Field Distribution
typ. 6mm diameter
Vertical field component
N
R1
S
Magnet axis
Magnet axis
Vertical field component
Bv
(45 75mT)
R1 concentric circle; radius 1.1mm
0
360
360
The magnet’s field strength perpendicular to the die surface should be verified using a gauss-meter. The magnetic field B v at a given distance, along a concentric circle with a radius of
1.1mm (R1), should be in the range of ±45mT to ±75mT. (see
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AS5035 −
Choosing the Proper Magnet
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 23:
Defined IC Center and Magnet Displacement Radius
1
3.9 mm 3.9 mm
2.433 mm
2.433 mm
Defined
center
R d
Area of recommended maximum magnet misalignment
Magnet Placement:
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
radius includes the placement tolerance of the chip within the
SSOP-16 package (+/- 0.235mm). The displacement radius R d
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 22 ). 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.
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AS5035 −
Angular Output Tolerances
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
Figure 24:
Vertical Placement of the Magnet
N S
Die surface Package surface z
0.576mm ± 0.1mm
1.282mm ± 0.15mm
Angular Output Tolerances
Accuracy
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 = (Err max
– Err min
)/2 is specified as better than
±0.5 degrees @ 25°C (see
).
Misalignment of the magnet further reduces the accuracy.
Figure 26 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.
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AS5035 −
Angular Output Tolerances
Figure 25:
Example of Linearity Error Over XY Misalignment
6
5
4
°
3
2
1
0
800
500
200
-100
x
-400
-700
-1000
y
For each misalignment step, the measurement as shown in
Figure 14 is repeated and the accuracy (Err max
– Err min
)/2
(e.g. 0.25° in
Figure 26 ) 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 measurements was a cylindrical
NdFeB (Bomatec® BMN-35H) magnet with 6mm diameter and
2.5mm in height.
Figure 26:
Example of Linearity Error Over 360°
linearity error with centered magnet [degrees]
-0.2
-0.3
-0.4
-0.5
0.5
0.4
0.3
0.2
0.1
0
-0.1
0
° 90°
Err m a x
180°
Err m in transition noise
270° 360°
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V
V
AS5035 −
Angular Output Tolerances
Transition Noise
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:
Figure 27:
Incremental Signal Tolerances with Transition Noise
Parameter
Index Pulse width
A,B Pulse width
Period
A-B Phase shift
Tolerance (1
σ)
(rms)
1.406° ± 0.06°
2.813° ± 0.06°
5.625° ± 0.06°
90e° ± 1.9e°
Tolerance (3
σ)
(peak)
1.406° ± 0.18°
2.813° ± 0.18°
5.625° ± 0.18°
90e° ± 5.7e° e° = electrical degrees (see
The algorithm used to generate the incremental outputs guarantees no missing or additional pulses even at high speeds
(up to 30000 rpm and higher).
High Speed Operation
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 position sensors 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 10000rpm.
1. Statistically, 1 sigma represents 68.27% of readings, 3 sigma represents 99.73% of readings.
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AS5035 −
Angular Output Tolerances
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:
e sampling
= rpm * 6E
-4
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.
Temperature
Magnetic Temperature 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 ±45mT to ±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°C to 125°C = 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.
Accuracy over Temperature
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.
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.
ams Datasheet (discontinued)
[v2-02] 2017-Jun-23
AS5035 −
Failure Diagnostics
Failure Diagnostics
The AS5035 also offers several diagnostic and failure detection features:
Magnetic Field Strength Diagnosis
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).
Power Supply Failure Detection
MagINCn and MagDECn Pins
These are open drain outputs and require external pullup resistors. In normal operation, these pins are high ohmic and the outputs are high (see
Figure 16 ). 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).
Incremental Outputs
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
Power-Up Diagnostic Feature ).
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 t
PwrUp
).
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.
ams Datasheet (discontinued)
[v2-02] 2017-Jun-23
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AS5035 −
Pack age Drawings & Mark ings
Package Drawings & Markings
The device is available in a 16-Lead Shrink Small Outline package SSOP-16.
Figure 28:
AS5035 Package Drawings and Dimensions
YYWWMZZ
AS5035 @
RoHS
Green
Symbol
c
D
E
E1
A
A1
A2 b e
K
L
Dimensions mm inch
Min Nom Max Min Nom Max
1.73
0.05
1.68
0.25
0.09
6.07
7.65
5.2
0°
0.63
1.86
0.13
1.73
0.315
0.17
6.20
7.8
5.3
0.65
-
0.75
1.99
0.21
1.78
0.38
0.25
6.33
7.9
5.38
8°
0.95
0.68
0.73
0.78
0.002
0.005
0.008
0.066
0.068
0.070
0.010
0.012
0.015
0.09
0.17
0.25
0.239
0.244
0.249
0.301
0.307
0.311
0.205
0.209
0.212
0°
0.0256
8°
0.025
0.030
0.037
Note(s):
1. JEDEC Package Outline Standard: MO - 150 AC.
2. Thermal Resistance R th(j-a)
: typ. 151 K/W in still air, soldered on PCB.
3. IC's marked with a white dot or the letters "ES" denote Engineering Samples.
Figure 29:
Marking: YYWWMZZ@
YY
Last two digits of the manufacturing year
WW M ZZ @
Manufacturing week Plant identifier Traceability code Sublot Identifier
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ams Datasheet (discontinued)
[v2-02] 2017-Jun-23
AS5035 −
Package Drawings & Markings
Recommended PCB Footprint
Figure 30:
PCB Footprint
Recommended Footprint Data
Symbol mm inch
C
D
A
B
E
9.02
6.16
0.46
0.65
5.01
0.355
0.242
0.018
0.025
0.197
ams Datasheet (discontinued)
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AS5035 −
Ordering & Contac t Information
Ordering & Contact Information
The devices are available as the standard products shown in
Figure 31:
Ordering Information
Ordering Code Package
AS5035-ASST SSOP-16
Marking
AS5035
Delivery Form
Tape & Reel
Delivery Quantity
1 reel = 2000 devices
Not Recommended for New Designs!
ams AG is discontinuing production of this device. Final lifetime buy order must be placed by DECEMBER 31, 2017.
Buy our products or get free samples online at: www.ams.com/ICdirect
Technical Support is available at: www.ams.com/Technical-Support
Provide feedback about this document at: www.ams.com/Document-Feedback
For further information and requests, e-mail us at: [email protected]
For sales offices, distributors and representatives, please visit: www.ams.com/contact
Headquarters
ams AG
Tobelbader Strasse 30
8141 Premstaetten
Austria, Europe
Tel: +43 (0) 3136 500 0
Website: www.ams.com
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[v2-02] 2017-Jun-23
AS5035 −
RoHS Compliant & ams Green Statement
RoHS Compliant & ams Green
Statement
RoHS:
The term RoHS compliant means that ams AG products fully comply with current RoHS directives. Our semiconductor products do not contain any chemicals for all 6 substance categories, including the requirement that lead not exceed
0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, RoHS compliant products are suitable for use in specified lead-free processes.
ams Green (RoHS compliant and no Sb/Br):
ams Green defines that in addition to RoHS compliance, our products are free of Bromine (Br) and Antimony (Sb) based flame retardants
(Br or Sb do not exceed 0.1% by weight in homogeneous material).
Important Information:
The information provided in this statement represents ams AG knowledge and belief as of the date that it is provided. ams AG bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. ams AG has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. ams AG and ams AG suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
ams Datasheet (discontinued)
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Copyrights & Disclaimer
AS5035 −
Copyrights & Disclaimer
Copyright ams AG, Tobelbader Strasse 30, 8141 Premstaetten,
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.
Devices sold by ams AG are covered by the warranty and patent indemnification provisions appearing in its General Terms of
Trade. ams AG makes no warranty, express, statutory, implied, or by description regarding the information set forth herein. ams 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 ams AG for current information. This product is intended for use in commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equipment are specifically not recommended without additional processing by ams AG for each application. This product is provided by ams AG “AS IS” and any express or implied warranties, including, but not limited to the implied warranties of merchantability and fitness for a particular purpose are disclaimed.
ams 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 ams AG rendering of technical or other services.
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[v2-02] 2017-Jun-23
AS5035 −
Document Status
Document Status
Document Status
Product Preview
Preliminary Datasheet
Datasheet
Datasheet (discontinued)
Product Status
Pre-Development
Pre-Production
Production
Discontinued
Definition
Information in this datasheet is based on product ideas in the planning phase of development. All specifications are design goals without any warranty and are subject to change without notice
Information in this datasheet is based on products in the design, validation or qualification phase of development.
The performance and parameters shown in this document are preliminary without any warranty and are subject to change without notice
Information in this datasheet is based on products in ramp-up to full production or full production which conform to specifications in accordance with the terms of ams AG standard warranty as given in the General Terms of
Trade
Information in this datasheet is based on products which conform to specifications in accordance with the terms of ams AG standard warranty as given in the General Terms of
Trade, but these products have been superseded and should not be used for new designs
ams Datasheet (discontinued)
[v2-02] 2017-Jun-23
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AS5035 −
Revision Information
Revision Information
Changes from 2-01 (2016-Sep-21) to current revision 2-02 (2017-Jun-23)
Update of document status
Update of Ordering Information section by adding NRND statement
Note(s):
1. Page and figure numbers for the previous version may differ from page and figure numbers in the current revision.
2. Correction of typographical errors is not explicitly mentioned.
Page
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ams Datasheet (discontinued)
[v2-02] 2017-Jun-23
AS5035 −
Content Guide
Content Guide
ams Datasheet (discontinued)
[v2-02] 2017-Jun-23
1 General Description
1 Key Benefits & Features
2 Applications
3 Block Diagram
4 Pin Assignment
4 Pin Description
5 Unused Pins
6 Electrical Characteristics
6 Absolute Maximum Ratings
7 DC Characteristics for Digital Inputs and Outputs
8 Magnetic Input Specification
9 Electrical System Specifications
10 Timing Characteristics
10 Incremental Output Signal Tolerances
11 Programming Conditions
12 Connecting the AS5035
12 Power Supply
12 5.0V Operation
12 3.3V Operation
13 Logic High and Low Levels
13 Output Current
13 Chip Select Pin CSn
13 Without Power-up Diagnostic Feature
13 With Power-up Diagnostic Feature
14 MagInc and MagDec Indicators
15 Incremental Outputs
15 A,B and Index
15 Hysteresis
16 Zero Position Programming
17 OTP Programming Timing
17 CCW Bit Programming
19 Simulation Modelling
21 Choosing the Proper Magnet
22 Physical Placement of the Magnet
23 Angular Output Tolerances
23 Accuracy
25 Transition Noise
25 High Speed Operation
25 Sampling Rate
26 Output Delays
26 Temperature
26 Magnetic Temperature Coefficient
26 Accuracy over Temperature
26 Timing Tolerance over Temperature
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AS5035 −
Content Guide
27 Failure Diagnostics
27 Magnetic Field Strength Diagnosis
27 Power Supply Failure Detection
27 MagINCn and MagDECn Pins
27 Incremental Outputs
28 Package Drawings & Markings
29 Recommended PCB Footprint
30 Ordering & Contact Information
31 RoHS Compliant & ams Green Statement
32 Copyrights & Disclaimer
33 Document Status
34 Revision Information
Page 36
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ams Datasheet (discontinued)
[v2-02] 2017-Jun-23
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